Purpose, composition and placement of equipment. Technical Operation Manual. intercom - description and operation Aircraft intercom device type SPU 9
The SPU-7 intercom is intended: for intra-helicopter communication using an AG-2, GSSH-A-18 aviation headset or a headset between all crew members; for pilots to access external radio communications through two radio stations and two radio compasses; for listening to special-purpose signals from voice communication equipment RI-65B; to listen to the “DANGEROUS” pitch tone sound signal from the radio altimeter, regardless of the position of the radio switches on subscriber devices; for recording onto the wire sound carrier of the MS-61 tape recorder information and commands received via radio communication lines and the helicopter’s internal on-board telephone communication through the helicopter commander’s subscriber unit.
PLACEMENT OF INTERCOMING DEVICE ON A HELICOPTER:
The low-frequency amplifier is installed on the shelf behind the co-pilot's seat on frame 5H;
Pilots' telephones to the left and right of the gas station panels on the ceiling of the pilot's cabin;
Operator's subscriber unit with switch "ON - LARING - OFF." on the left side of the cargo compartment between ShP 6 and 7;
the trigger button "SPU-1 - RADIO-2" is installed on each cyclic step handle.
On a helicopter, the SPU-7 intercom works with two communication points:
One talking point is installed in the cockpit door opening in a special niche on the right, intended for communication by the flight engineer. It has an external button “SPU” on the bracket of the right shelf and a switch “LISTENING ARK-U2 - ARK-9” located there;
The second additional communication point is installed in the cargo compartment on the wall of the Shch No. 1 near the sliding door.
For the convenience of the flight mechanic (operator) with the control system working with the onboard or external sling, the helicopter has three extension cords with 4-pin female half-connectors - in the cockpit on the right side of the door opening and in the cargo compartment on the wall of frame No. 1.
The co-pilot can conduct intra-helicopter communication constantly (without pressing the "SPU-RADIO" trigger button on the control stick) when the "LARINGIT" switch on the right side panel of the electric control panel is set to the "ON" position.
MAIN TECHNICAL CHARACTERISTICS.
The intercom is connected to the battery bus through the gas station circuit breaker GK-2 "SPU-7", on the right panel
Gas station for pilots' electric control panel.
Supply voltage………………………….....(27±2.7)V.
Power consumption…………………………50W.
Laryngophone supply voltage or
aircraft headset amplifiers...................................3-5V.
The gain is adjusted by variable resistance on the low-frequency amplifier and
can reach…………………………………100 times.
Frequency range……………………………..300...3500Hz.
BRIEF CHARACTERISTICS OF THE SET.
The main elements of the intercom are subscriber units. They are used for connecting microphones and headphones to various means of communication, as well as for switching power circuits for starting relays of radio transmitters.
The functional diagram of the intercom is shown in Fig. 3., shows the interconnection of individual cascades and nodes, communication with other associated radio equipment. In the functional diagram, individual blocks and stages are indicated by rectangles, each of which has an input and output shown by arrows. The switching equipment of the intercom is located in the RKSPU distribution box.
The intercom is controlled using knobs and switches installed on the SPU-7 subscriber unit and sequential switching buttons "SPU-RADIO" type 2KPP, when the trigger is pulled, before the first stage is triggered, the operation is in intra-helicopter communication mode, and when pressed until it triggers second stage – operation in “RADIO” mode (external communication). A low frequency amplifier (LF) is needed only to provide intra-helicopter communications.
Fig.1 General view of the SPU-7 subscriber device.
1 – listening volume control; 2 – general volume control; 3 – switch for internal and external radio communications; 4 – radio station switch; 5 – circular call button; 6 low frequency amplifier switch (not used on the helicopter).
The radio station switch (r/st) connects aircraft headsets to various radio equipment. The switch has 6 positions;
UKR - command station "BAKLAN-20"
SR - connected r/st "YADRO-1A"
KR – not involved;
DR – not involved;
RK-1 – ARK-9 radio compass;
RK-2 – ARK-U2 radio complex with R-852.
The helicopter uses one low-frequency amplifier, so the “NETWORK” switches on subscriber units are not used.
The "CV" button is used to transmit information to all crew members with increased volume.
Smooth control of the volume of speech transmitted over internal or external communication networks is carried out with the “GENERAL” volume control, and the level of listening to signals from the intercom network when working over the intercom and signals from the intercom network when working over the external communication network is carried out using the “SPAN” volume control. Therefore, the “Listening” knob cannot be set to the left extreme position, since in this case the signal is not listened to.
Fig.2 General view of the meeting point.
The operation of the "CALL" button on the call point is similar to the operation of the "CV" button on the subscriber device.
Additional points of the flight mechanic (operator) allow only intra-helicopter communication; access to radio communication from additional communication points is not provided.
From the operator's subscriber unit on the left side of the cabin, not only intra-helicopter conversations are possible, but also listening to radio traffic through the BACLAN-20 command radio station (position UKR).
The “DANGER ALTITUDE” sound signal from the radio altimeter is sent to the headphones of all crew members, regardless of the position of the switches on the subscriber sets.
Voice messages about emergency situations, as well as recording of audio information on a tape recorder, are carried out through the subscriber unit of the helicopter commander (left pilot).
OPERATING LIMITATIONS.
Turn on before starting the engines, keep the SPU-7 power supply on during the entire flight; turn off after landing and complete engine shutdown.
NORMAL OPERATION OF THE NEGOTIATION
SPU-7 DEVICES.
Before starting the engines, turn on the batteries and connect the aircraft headsets to subscriber devices and call points.
1. Turn on the gas station "SPU-7" on the right panel of the gas station.
2. On the subscriber device, set the NETWORK switch to the NETWORK-1 (or NETWORK-2) position.
3. To call crew members, press the “SGGU-1” or “CV” button for the pilots, the “SPU” or “CALL” button for the flight mechanic - transmit messages, release the buttons to listen for the answer. If the SPU-RADIO switch on the subscriber units is set to the “SPU” position, then when conducting internal communication, the pilot-in-command and the co-pilot can simultaneously listen with a reduced volume to the radio reception of the radio station to which their radio switches are set. The reception volume is adjusted with the “LISTENING” knob, and the volume of intra-helicopter communications is adjusted with the “GENERAL” knob.
4. To conduct radio communication, set the “SPU-RADIO” switch to the “RADIO” position; Having selected the desired radio station with the radio station switch to transmit the message, press the trigger button all the way to the second stop “RADIO-2”, releasing the button and listen to the answer, adjusting its volume with the “GENERAL” knob.
NOTE: When the switch for internal and external radio communication is in position. "SPU" it is impossible to turn on radio station transmitters when you press the "RADIO" button. In this case, the operation of the "RADIO" button is similar to the operation of the "SPU" button.
WORK OF THE FLIGHT MECHANIC (OPERATOR) WITH SPU-7.
1. To listen to signals received by radio compasses, the flight mechanic must set the “LISTENING ARK-9 - ARK-U2” switch to the “ARK-9” or “ARK-U2” position. In this case, to call the flight mechanic, pilots press the “CV” button on their subscriber unit, and the flight mechanic must set the “LISTENING” switch to answer. In the neutral position and press the "SPU" button, or leaving the "LISTENING" switch. In the position of the radio compass you are listening to, press the “CALL” button on the intercom. Adjust the volume of received messages using the “LOUDER” control on the intercom.
2. When transmitting long-term messages (working with a winch, with an external sling, etc.), it is necessary to turn on “LARING” at the additional communication point.
The co-pilot can use the LARING switch on the right side panel of the electric console. In the “ON” position, you can conduct intercom without pressing the “SPU-RADIO” button on the control knob.
POSSIBLE MALFUNCTIONS OF SPU-7, THEIR SIGNS AND
CREW ACTIONS.
The operation of the SPU-7 before flight and in flight is determined by clear listening and transmission via external and internal communication networks, clear operation of buttons, switches, and volume controls.
SIGN: There is no internal and external communication. NECESSARY ACTIONS:
Check that the DC source is turned on;
Check that gas stations “SPU-7”, “COMMAND RS”, “Svyaznaya RS” are turned on;
Check the position of the "SPU-LARING" switch on the control panel of the MS-61 tape recorder, set pos. "SPU";
Set the switch “LISTENING ARK-9 - ARK-U2” to the neutral position;
Check and replace the aircraft headset if faulty.
RADIO COMMUNICATIONS EQUIPMENT
AIRCRAFT INTERCOMING DEVICE SPU-8
SET AND PLACEMENT
The main elements of an aircraft intercom are:
Low frequency amplifier with power supply
Subscriber devices
Switching devices
The AA1 subscriber device is a switching device and an isolating amplifier, with the help of which the aircraft headset is connected to selected radio devices, switching communication networks, accessing circular communication and separately adjusting the volume level of signals.
AA1 subscriber sets are installed at the workplaces of pilots, navigators and radio operators.
At the pilots' workplaces, the navigator's upper panel, the radio operator's panel, the senior on-board technician and the operator, reservation switches RESERVE - SPU are installed.
The selective communication panel is installed on the crew commander's protection and cargo hatch control panel under the AA1 subscriber unit.
The trigger is installed on the handle of the steering wheel: for the crew commander - on the left handle, for the assistant commander - on the right.
CONTROLS
The controls are located on the subscriber unit AA1, ShchIS-1. On the front panel AA1 (Fig. 1) there are:
Switch SPU - RAD, designed to select the preferred network (main)
NETWORK 1-2 switch for connecting the subscriber device to one of two communication networks
Radio communications switch RAD, connecting the start circuit and the aircraft headset to the selected radio device during installation
UK1 - to the radio station R-862-1 UK2 - to the radio station R-862-2 KR - to the radio station R-847 T No. 1 SR - to radio station R-847T No. 2
DR1 - to the localizer KUSR-MP-2-I
DR2 - to the localizer KUSR-MP-2-II DP - to the RSBN-7S or SDK-67 receiver when it is turned on
RK1 - to the ARK-15-1 or ARK-U2 r/compass when it is turned on
RK2 - to radio compass ARK-15-11
LIST switch connects the receiver output, which needs to be listened to additionally.
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The switch position corresponds to the positions of the RAD switch. OFF position not used.
The Central Bank button for a circular (general) call to all subscribers of the network switches subscriber devices into the mode of circular communication between all subscribers, regardless of the position of the switches on them (this ensures that all subscribers can listen to the call signal with maximum volume) knobs of the potentiometers RAD, SPU, TRANSPORT. are designed to adjust the volume of signals in phones.
The RAD regulator regulates the volume of signals from the output of receivers selected by the radio communications switch. The SPU regulator regulates the volume of intra-aircraft communication signals.
LIST knob adjusts the volume of signals from the output of receivers selected for additional drying.
Selective communication panel ShchIS-1 (Fig. 2) designed for the crew commander to selectively call any of the five crew members. Switches on the front panel. ShchIS-1 are used to transfer the subscriber unit of the crew commander and the called subscriber to the selective network. Using switches you can call:
AB1 - navigator
AB2 - radio operator
ABZ - senior onboard technician
AB4 - stern operator
AB5 - crew commander
The SPU - RADIO trigger provides pilots with access to external and internal radio communications. When the trigger is pressed until the first click, access to internal radio communication is provided, until the second click
To external radio communication.
COMMAND RADIO R-862M
SET AND PLACEMENT
The aircraft is equipped with two sets of P-862M. The first set has a built-in emergency VHF receiver, the second set has a built-in emergency UHF receiver. The transceiver of the first set is located in the technical compartment of the radio equipment, on the starboard side, on the radio shelf, between frames No. 12A and 13. The transceiver of the second set is located under the transceiver of the first set. Radio control panels (two remote controls per set) are located on the pilot's upper panel and on the radio operator's dashboard: With The remote control of the first set is installed on the left side, and the second set on the right.
The AShS-GM antennas of the first set are installed in the lower part of the fuselage, along the axis of symmetry of the aircraft, between frames No. 23 and 24; second com-
plect - in the upper part of the fuselage, to the right of the axis of symmetry of the aircraft, between frames No. 14 and 15.
CONTROLS
The radio station is controlled remotely, carried out from the control panel (Fig. 3). On the control panels of the radio station of pilots and radio operators are located:
- a dialing (ND) or storage (memory) device designed to select one of 20 fixed, pre-configured communication frequencies (with a memory) or any of 9200 frequencies (with a memory);
AP switch for connecting listening to the emergency receiver;
AP lamp for light indication of reception of a signal from an emergency radio station;
PN switch to turn on the receiver noise suppressor;
AM-FM switch for selecting the type of operation of the radio station;
UPR switch to enable control of the radio station from this remote control;
UPR lamp for signaling that control has been taken from this remote control.
COMMUNICATION RADIO STATION R-847T
SET AND PLACEMENT
1. Reference generator receiver - exciter power supply and power amplifier are installed in the rear part of the fuselage, between frames No. 82-85.
2. P7T-G control panels are installed on the panel of the pilots' right control panel.
3. The LVP antenna is a rigid metal structure and is made in the form of a nose spinner of the keel fairing.
4. The ANTENNA switch has three positions: KV1, PRD KV1/PRM KV2, KV2 provides two-way communication via the radio station KV1 (position
HF1) and on the radio station HF2 (position HF2) or transmitting on the radio station HF1 and receiving on the radio station HF2 (position PRD HF1/PRM HF2).
CONTROLS
On the pilot's control panel (Fig. 4) there are controls and alarms for the operation of the radio station:
Switch ON -RADIST, designed to connect the control panel to the radio station. If it is set to the RADIST position, the radio station is controlled from the radio operator's console. The connection of the control panel to the radio station is signaled by the illumination of the control panel backlight lamps and the corresponding indicator lamps;
Switch for types of work AM-OM. In the AM position, the radio station operates in telephone mode with amplitude modulation, in the OM position - in single-sideband modulation mode;
The CHANNEL switch is designed to tune the radio station to one of 18 communication frequencies preset on the memory device;
- The RRU-AGR switch is designed to change the receiver gain control mode. In the AGC position, the signal gain control by the receiver is automatic, the signal volume is changed with the VOLUME control, in the RRU position with the VOLUME control. manual adjustment of the receiver gain is carried out;
SELF-CONTROL handle serves to adjust the volume of self-listening signals when transmitting;
The PRM display indicates that the radio station is ready to operate in the “Receive” mode.
- the PRM display indicates that the radio station is ready to transmit, while the PRM display goes out;
The red signal lamp RADIATION lights up in time with the transmitted information, at the same time the PRD display lights up;
Scoreboard NAST. signals that the radio station is operating in readjustment mode, while the PRM display lights up at full intensity. It is not possible to use the radio at this time;
The TERMO board lights up when the thermal conditions in the radio station blocks are violated. When the THERMO board is triggered, the radio station can only operate for reception;
The BARO display lights up when the pressure in sealed blocks drops below 460mm. rt. Art. The radio station can only be used for reception.
USE IN FLIGHT
1. Before turning on the power, set the controls on the P7T-G pilot's console to their original position:
Set the ON-RADIOIST switch to the ON position;
Set the AM-OM switch to the AM position;
Set the AGC-RRU switch to position a AGC;
- Use the CHANNEL switch to set the communication channel.
2. Power on:
At RU24, RU42, RU44 turn on NPP KB1, KB2;
At RU22 turn on the NPP: DEVICES. BOARD 2 LINE OF RIGHTS; SECOND LINE RADISTER;
Turn on the power to SPU-8.
3. On the right pilot's SPU-8 subscriber set:
Radio communications switch RAD. - to the KR position;
Volume control RAD. - at maximum volume;
Switch SPU-RAD. - to the RAD position.
Check the connection of the aircraft headset to the SPU connector.
4. On the radio operator's panel:
Set the ANTENNA switch to position HF1;
Turn on the power supply to the R-847T No. 1 using the KV1 switch.
AIRCRAFT TAPE RECORDER MS-61
SET AND PLACEMENT.
Two recording devices with one control panel are installed. The main and backup recording devices are completely identical. To preserve sound cassettes, recording devices are placed in armored sealed casings, which are painted orange and installed on the frame on the left side, between frames No. 68-70.
The control panel is installed on the crew commander's protection and cargo hatch control panel. Switch CHECK MS-61 and
light display FAILURE MAIN. MS-61 are installed at the crew commander’s workplace next to the tape recorder control panel.
CASE FOR SPARE CASSETTES MS-61B is designed for storing cassettes. The tape recorder is not included. Located in the technical compartment on the right side. on frame No. 14
CONTROLS.
1.
Toggle switch "ON - OFF" - to turn on the power.
2. Toggle switch "CONTINUOUS OPERATION AUTO START" to select the operating mode of the tape recorder.
3. Toggle switch "SPU - LAR" - in LAR mode, the recording amplifier is directly connected to the microphone of the flight commander's headset.
4. “Recording” lamp - signals the operation of the tape recorder.
5. "BACKLIGHT" knob - to adjust the brightness of the remote control backlight.
4.3 OPERATIONAL CHECK AND USE IN FLIGHT
The tape recorder is turned on before starting the engines, and turned off after the engines have completely stopped.
On the tape recorder control panel, set the SPU-LAR switch to the SPU position, the AUTO START - CONTINUOUS OPERATION switch to the CONTINUOUS OPERATION position, the power switch is ON. -OFF - to ON position. Make sure that the RECORD and BACKLIGHT lamps are on; the BACKLIGHT knob adjusts the brightness of the remote control backlight. Press the RADIO trigger until the first click and by the presence of self-listening of your program and the RECORD lamp lighting, make sure that the main tape recorder is capable of recording.
Set the SPU-LAR switch to the LAR position. Speak the specified text into the microphone of the aircraft headset. By the presence of self-listening, make sure that the main tape recorder is working. Press the TEST MS-61V switch in
RESERVE position and check the backup tape recorder in the SPU and LAR modes. In this case, the MAIN FAILURE display will light up. MS-61B. The RECORD lamp remains lit. Release the handle of the switch CHECK MS-61V. Display FAILURE MAIN. MS-61 B will go out. During flight, use the "Continuous Operation" mode. In the LAR mode, the crew commander is disconnected from access to external and internal radio communications, and listening to commands and signals with a reduced volume is ensured.
SET AND PLACEMENT.
1. The flight attendant shield is installed on the radio shelf of the technical compartment of the cockpit (frames 12-13).
2. Two U-15P amplifiers are installed on the radio shelf in the technical compartment of the cockpit (frames 12-13).
3. Microphones SGU-15 are located at the workstations of the crew commander and crew, and are connected to subscriber devices.
4. The SGU-15 volume control is installed on the crew commander's panel. It is used to reduce the acoustic coupling between the crew commander's microphone and the loudspeakers.
5. Sound speakers are installed on the left and right sides of the cargo compartment, 10 speakers are installed along each side (speaker unit BGR-14).
CONTROLS.
1. Microphones SGU-15 are connected to subscriber devices and are used to notify personnel.
2. The SGU-15 volume control is used to reduce the acoustic coupling between the crew commander's microphone and the loudspeakers.
SET AND PLACEMENT
The aircraft is equipped with two sets of ARK-15M. (The first set is installed on the left side, the second on the right side).
The first and second sets of radio compasses include:
Receivers located in the shp area. No. 48;
Control panels (two per set) located on the pilot's upper panel and on the navigator's instrument panel;
Frame antennas located in the upper part of the fuselage, under the radio-transparent fairing along the axis of symmetry, in the area of sp. No. 50;
Omnidirectional loop antennas located on a radio-transparent radome (on the left - 1 set, on the right - 2 sets);
Matching devices located near the input of omnidirectional antennas.
SET AND PLACEMENT
1. The antenna unit is located in the bottom cutout No. 28 and is covered with a radio-transparent insert.
2. The antenna amplifier is located next to the antenna unit. 3. The R-852 receiver with switching room is located at the radio operator’s workplace, in the area of shp. No. 11.
The front panel of the R-852 receiver contains:
Channel switch for tuning the receiver to four fixed frequencies;
RRG regulator for adjusting the signal volume.
1 . The control circuit block is located in the upper part of the fuselage, in the area of sp. No. 11.
2. The control panel is located on the pilot’s upper panel (Fig. 7 ).
On the 
The front panel of the remote control contains:
ON switch for turning on the power;
Switch L-FRAME-P, designed for manual rotation;
Framework for performance testing;
FEELINGS V-M switch, designed to change the amount of braking torque of the frame rotation motor.
3. The AShS-GM antenna is located in the upper part of the fuselage along the axis of symmetry, in the area
sp. No. 11.
4. The VSUP-2 indicator is located on the navigator’s instrument panel.
KIT AND PLACEMENT OF RV-5M
Two sets of radio altimeters are installed on the aircraft, and their synchronous operation is ensured.
The first set (radio altimeter RV-5M) includes:
The transceiver is located in the technical compartment, in the shp area. No. 51; horn transmitting antenna, located in the lower part of the fuselage along the axis of symmetry, sp. No. 4 9;
The receiving antenna is a horn located in the lower part of the fuselage along the axis of symmetry, sp. No. 52;
Altitude indicators (2 pcs.): UV-5M-1 - on the left pilot’s instrument panel (main indicator with a scale of up to 750 m), UV-5RM-1 with a scale of up to 1000 m - on the navigator’s instrument panel;
"DANGER ALTITUDE" display on the left pilot's instrument panel (the signal on the display is issued only from the left pilot's UV-5M-1 indicator);
"TURN OFF RV-5" display and power switch RV-5 LEV. on the left horizontal panel;
The second set (radio altimeter RV-5M) includes:
Transceiver installed in the front trunk, sp. No. 33;
Antennas, receiving and transmitting, located at the bottom of the fuselage along the axis of symmetry, respectively sp. No. 35-38;
Altitude indicators (2 pcs.) with a scale up to 750m - on the right pilot's instrument panel. UV-5M-4 above the left pilot’s instrument panel (additional indicator with a scale of up to 120 m);
The "DANGEROUS ALTITUDE" display is on the right pilot's instrument panel; the signal on the display is issued only from the right pilot's UV-5M-1 indicator;
“TURN OFF RV-5” display and power switch RV-5 RIGHT. on the right vertical panel.
Signals on the “TURN OFF RV-5” display of both sets come from altitude alarms (barorelay SVU-12-1A), starting from an altitude of 2500m. When the aircraft descends to an altitude of 2500m or less, the barrel ensures that the radio altimeters are turned on regardless of the position of the RV-5 LEV power switches. (RIGHT).
SVU-12-1A is installed in the lower part of the fuselage, under the KP-2V antenna fairing.
USE IN FLIGHT
In flight, radio altimeters do not require controls or adjustments. They are turned on after the engines are started. At temperatures below -20° C
Ready to work time is 10-15 minutes after switching on. At an ambient temperature of +60C, radio altimeters can operate for no more than 15-20 minutes.
When flying outside the operating range, at altitudes of 1000 - 2000m, the indicator arrows will be set to darkened sectors of the scales.
IF they are not turned off, at an altitude of 2500m the “TURN OFF RV-5” sign will light up based on a signal from the SVU-12-1A. In the future, when descending, the SVU-12-1A will automatically turn on the radio altimeters at an altitude of 2500m, if they were turned off.
When flying over mountainous areas, do not turn on the radio altimeters. Set the target altitude index to an altitude of 700m. The “TURN OFF RV-5” display will be constantly lit.
Radio altimeters provide data on the true flight altitude at roll and pitch angles of no more than 15°. At roll and pitch angles of more than 15°, the measurement error increases; for roll and pitch angles over 30°, do not use altimeter readings.
When flying over a thick layer of ice and snow, radio altimeters measure altitude with a larger error, since the measurement is made from the lower edge of the ice and snow cover. True altitude is measured only over wet ice and snow.
If the radio altimeter fails in flight at altitudes below 750 m, a blanker will open on the scale of the corresponding indicator. After landing, radio altimeters must be turned off.
SET AND PLACEMENT
1. Monoblock receivers - for receiving, converting and separating into azimuth and range channels, signals from navigation and landing radio beacons. It consists of two ADPK-1 receiving devices, a signal combining unit and an FAI unit, located on the shock-absorbing frame. Located in the technical compartment of the pilot's cabin, on the shelf on the starboard side, between the shanks. No. 9-10
2. The BIO monoblock consists of an azimuth and range measurement unit (VIAD), an interface unit (IC), and an evaluation unit (EP), located on the shock-absorbing frame. Performs azimuth and range measurements. Returns values az. And. range in UVK for correction of current coordinates, as well as GOT signals. A and GOT. D in UVK and on indicator blenders. Converts measured azimuth and range values into indicator readings. Located next to SZD-PM.
3. The switching monoblock consists of a landing signal switching unit (LSB) and a relay unit (BR), installed on a common shock-absorbing frame. Located next to BIO.
The BKP is used to connect the output signals of the landing channels RSBN-7S and KURS-MP-2 to the SAU-1T-2B and NPP and KPP devices, as well as for automatically connecting the landing channels of the second set
if the first one fails. The BR provides separate adjustment of the ADPC-1 receivers and the SZD-PM transmitter in the "NAVIGATION", "NAVIGATION-LANDING" and "LANDING" modes. In addition, the relay unit provides communication between the RSBN-7S equipment and the TKS-P, UVK, KURS-MP2 , SDK-67.
4. The navigation channel switching panel (SHPNK) and the T4-U2B display, signaling the connection of the systems to the "LANDING" mode, are located at the navigator's workplace.
5. The landing channel switching panel (CHPKP) is located on the navigation and landing panel of the pilot's upper flap.
6. The radio systems selector (SRTS) is located on the navigation and landing panel.
7. Radio range indicator (IDR-2). One indicator is located on the left pilot's instrument panel, the other on the navigator's instrument panel.
8. Digital azimuth indicator (TsIL-1) - on the navigator's instrument panel.
OPERATIONAL CHECK
INCLUSION. Make sure that:
Network protection circuit breakers on RU26 RSBN; on RU24 RSVN-RIGHT, SIGNAL; on RU23 RSBN-LEV; on RU22 RSBN-PION, RSBN BIO SZD are included;
On the SPU subscriber device, the WIRE switch. stands in the DP position;
VOLUME switch ON on the SDK-67 control panel is in the off position. On the navigation and landing panel, turn on the RSBN-7S POWER toggle switch. Depending on the set operating mode, the NAVIGATION or LANDING display or both displays will light up on the SCHPKN.
If the RSBN-7S equipment receives signals from ground-based radio beacons, the indicator blankers will open indicating the serviceability of the range and azimuth channels, and the range and azimuth will be indicated. The call signs of the radio beacon are listened to in the telephones at the pilots', navigators' and radio operators' workplaces.
USE IN FLIGHT
To ensure high reliability, the channels of the onboard equipment are duplicated.
The "NAVIGATION" mode is activated on the control panel. At the same time, the NAVIGATS display will light up on the ShchPKN panel. Install a working channel on the ShchPKN. If the aircraft is within the range of radio beacons, blankers will rise on TsIA-1 and IDR-2, and the instruments will show the range and azimuth of the aircraft relative to the beacons.
The transition to working with another beacon is made from the ShchPKN panel. Based on the azimuth and range signals, the aircraft coordinates calculated in the UVK are corrected. When the IDENTIFICATION toggle switch is turned on, the mark on the ground PPI bifurcates. The radio beacon's call signs are transmitted via the ground indication channel.
The "NAVIGATION-LANDING" mode is set on the control panel. At the same time, the “NAVIGATION” sign on the control panel will light up. and "LANDING". When the mode is turned on, the SZD-PM transmitter and the second ADPK-1 (right) operate in the “NAVIGATION” mode. The working channel is installed on the ShchPKN. If the aircraft is within the range of radio beacons, the azimuth and range to this radio beacon are displayed on TsIA-1 and IDR-2. UVK correction, operation of the ground identification channel and ground indication are provided, and the radio beacon call signs are listened to. If the azimuth and rangefinder channels fail, the instrument readings are crossed out.
The first ADPC-1 (left) operates in the “LANDING” mode. The landing channel is installed on the ShchPKP panel. On the RTS selector, the system switch is set to the CATET position. At the same time, the navigator’s RSBN display will light up; if the aircraft enters the PRMG-4 (PRMG-5) coverage area, the READY display will light up on the control panel. K, READY. The GOT display on the RTS selector will light up. P, GOT. K1, at the checkpoint the blankers K and G will be closed; signals of deviation from the equal-signal zones of the course and glide path are issued to the checkpoint and checkpoint ACS system.
If the heading and glide path channels fail, the GOT display on the RTS selector goes out. K1, GOT. G1, at ShchPKP - READY. K, READY. D, blenders will open at the NPP.
The "LANDING" MODE is turned on when the mode switch on the control panel is set to the POS position. and the RTS selector switch to the LINE position. The “LANDING” sign will light up on the control panel, and on the navigator’s instrument panel - "RSBN" scoreboard. Use the channel switch on the ShchPKP panel to set the landing channel.
If the aircraft enters the PRMG-4 (PRMG-5) coverage area, the READY sign on the control panel will light up. G, READY. K, on the RTS selector there is a GOT display. K1, GOT. G1, GOT. K11, GOT. G11. Blenders K and G will be closed at all checkpoints.
When the landing mode is turned on, the azimuth channel stops working, and the rangefinder channel of both receivers works with the rangefinder repeater installed on the PRMG-4 glide path beacon. IDR-2 will show the distance to the taxiway. Signals from PRMG-4 (PRMG-5) are sent to the ACS at the position bars of the NPP and gearbox. To stabilize the aircraft to the equal-signal zones of course and glide path during manual control, it is necessary to hold the bar at the flight control point and checkpoint.
place in the middle of the circle. During automatic landing, the aircraft is stabilized by the SAU-1T-2V system.
If the first receiver fails, the second receiver is automatically connected, and the GOT display on the SRTS goes out. K1, GOT. G1.
If the second receiver fails, the GOT display goes out. K11, GOT. 11. If the system fails during landing, the display on the RTS selector and READY will go out. K, READY. G on the ShchPKP shield.
SET AND PLACEMENT
1. The equipment of the KURS-MP-2 system consists of two identical semi-sets that operate independently of one another. Each semi-set includes: localizer radio receiver KRP-200P, glide path radio receiver GRP-20PM, navigation device UN-2P, readiness signal block BSG, marker receiver MRP-ZPM. (The listed equipment is combined into a monoblock on a shock-absorbing frame and is located on the starboard side of the navigator’s cabin, between pins No. 4-10).
2. Indicators of heading angles (three) are installed on the instrument panels of the pilots and navigator.
3. BUP amplifiers (three) are located next to IKU-1A.
4. Course selectors (two) are located on the pilots’ instrument panels,
5. The control units of the first and second sets, the SP-50 balance unit, the RTS selector, as well as the KURS-MP - POWER and MARKER toggle switches, the IKU-1 switch are installed on the pilot’s upper panel.
6. The ILS-VOR switch is on the right horizontal pilot control panel.
7. The marker receiver display (two) is located on the pilots’ instrument panels.
8. The mode switching display is located on the navigator's instrument panel.
9. The marker receiver antenna (one) is located in the lower part of the fuselage, between frames No. 44-45. To receive signals from radio beacons VOR, ILS, SP-50, the front unit of the PION-NP-76 antenna-feeder system, located under the KP-2 antenna radome, is used.
PRE-FLIGHT CHECK
1. Set the mode switch on the RTS selector to the VOR position, and the VOR display on the RTS selector and on the navigator’s instrument panel will light up.
2. Set the IKU-1 switch to the LEV position. FLIGHT, set the switches on IKU-1A to the VOR1, VOR2 position, set the ILS-VOR switch to the ILS position.
3. On the control units of each half-set, dial the frequency of the VOR beacon. If the aircraft is in the coverage area of the VOR beacon, the GOT display on the RTS selector will light up. K1, GOT. K2, at the pilots’ and navigators’ checkpoints the K blankers will be closed.
4. To listen to the call sign of the VOR beacon on the SPU-8 subscriber unit, switch BRAND. set to position DR1, (DR2) for the first (second) half-set.
5. Perform a similar check of the equipment in the SP-50 and ILS modes. At the same time, the SP and ILS displays, as well as the GOT display, will light up on the RTS selector and the navigator's display. K1, GOT. K2, GOT. G1, GOT. G2. Blankers K and G at the control point will close if the aircraft is within the coverage area of the course and glide path beacons.
USE IN FLIGHT
SET AND PLACEMENT
1. The SDK-67 block is designed to generate coded request pulses, receive and decode response beacon signals.
Located in the cargo compartment on the left side, in the shp area. No. 26.
2. The control panel is designed to turn on the rangefinder, select the operating frequency and operating mode. The control panel is located on the left horizontal panel of the pilot.
3. Antenna LM-001 quarter-wave monopole vibrator) is designed for receiving and transmitting vertically polarized signals. The antenna has an omnidirectional radiation pattern in the horizontal plane. It is located in the lower part of the fuselage under the radio transparent fairing, in the shp area. No. 26.
4. IDR-2 from the RSBN-7S kit is located on the left pilot’s instrument panel.
USE IN FLIGHT
Turn on SDK-67, check that RSBN-7s is turned on. Set the frequency value on the scale corresponding to the working channel of the DME beacon according to the flight mission. When working with the rangefinder channel of the TASA# radio beacon, you must set the frequency value corresponding to the channel number on the control panel:
Channels 1-16 correspond to the dialed value 134.4-135.9 MHz (through 0.1 MHz);
Channels 17-59 - dialed value 108.0-12.2 MHz (every 0.1 MHz);
Channels 60-69 - dialed value 133.3-134.2 MHz (through 0.1 MHz
Channels 70-126 - dialed value 112.3-117.9 MHz (every 0.1 MHz).
Set the DME-RESERVE switches to the DME position. At the same time, the navigator’s DME display will light up and, if the aircraft is in the radio beacon area, the blanker on the IRD-2 will be removed and the range to the radio beacon will be indicated.
Adjust the volume level for listening to call signs using the VOLUME control knob. ON
If it is necessary to transfer the rangefinder to the “hot” standby state, set the DME-RE-RESERVE switch to the RESERVE position. In this case, the IDR-2 readings will be crossed out with a blanker.
If the rangefinder Channel fails, the IDR-2 blanker cancels out the readings. After the flight, turn off the rangefinder.
SET AND PLACEMENT
1.
The monoblock is mounted on a folding radio-transparent fairing located in a cutout of the skin of the lower part of the aircraft fuselage, in the area
sp. No. 32.
2. Low-frequency units DISS-013 and a communication unit with other systems are located in the shp area. 3. The indicator is installed on the navigator's instrument panel.
7.2. CONTROLS AND INDICATORS
The computer has a “MEMORY” mode, in which the last values of W and B before disappearing are remembered and sent to the indicator (Fig. 15). In this case, the provision of information to external consumers stops and a search for signals is carried out.
When flying over the sea, the S-M "LAND-SEA" switch located on the indicator changes the operating mode of the computer. In this case, the calculated value of "I" increases by 1.3. The correction is due to the different nature of the reflection of radio waves from the sea surface and the appearance of the so-called offset error when measuring Doppler frequencies.
7.3. OPERATIONAL CHECK
DISS-013 is powered by a voltage of 36.115V with a frequency of 400Hz and a voltage of 27V through the DISS nuclear power plant at RU21, RU23, RU25. After turning on the nuclear power plant, the backlight of the indicator scale and the P display should light up.
After 2.5-Zmin. Set the K-P switch to position K (CONTROL). The P display should go out on the indicator and the ground speed values should be 97+19 km/h and the drift angle 0+1.5°. Set mode P (WORK). The meter goes into memory mode - the P display lights up. The readings should not change by more than +11 km/h and +1.
In addition to the indicator, the drift angle is displayed on the navigator's control panel - constantly and regardless of the operating mode of the self-propelled gun.
At the flight control point, the drift angle is given only in the operating modes of the self-propelled guns "KURS", "NAVIG." and when performing a pre-landing maneuver based on UVK signals.
SET AND PLACEMENT
1.
The A-711-1 monoblock is placed on the A-711-1 shock-absorbing frame and in the navigator’s cabin on a shelf, between frames No. 8-10. equipment, indicating operating modes and navigation parameters, is located on the navigator’s instrument panel (See Fig. 16).
2. The A-711-A loop antenna, for receiving signals from ground stations, is located in the upper part of the fuselage, between the sp. No. 51-59.
3. The A-711-2 matching unit, for amplifying signals at earth stations and transmitting them to the receiver, is located next to the loop antenna between the sp. No. 51-52.
SET AND PLACEMENT
1. The SO-63 block is designed to receive, decode request signals and generate response signals. It is located on the shock-absorbing frame in the rear part of the fuselage, in the area of sp. No. 82-83.
2. The ICAO code encoder (ICAO) is designed to decode request signals and generate response information messages in the YaB5 mode. Installed on a shock-absorbing frame in the rear fuselage.
3. Antennas of the 3-centimeter range provide visibility of the front hemisphere in the horizontal plane in a sector of angles ±90° relative to the direction of flight and +-30 C in the vertical plane. The receiving antenna AV-016 is located in the bow of the aircraft; the receiving antenna AV-014 is located on the right and left sides, between pins No. 3-4.
4. A remote video amplifier (VVA) is designed to combine and amplify video pulses from receiving antennas in the 3-centimeter range. Placed on a shock-absorbing frame on the forward part of the fuselage in the navigator's cabin.
5. The SO-63 control panel and the ICAO encoder control panel are designed to control the transponder during flights on intra-Union international airlines. Located on the left vertical panel of the pilot.
6. The blanking attachment is designed to protect the responder from the influence of other systems on its operation. Located next to block SO-63.
7.
Transceiver antenna AZ-018 with a radiation pattern of 360° in the horizontal and ±30° in the vertical plane. Designed to receive interrogations and transmit replies
signals when operating in ATC and RSP modes. Placed symmetrically at the top of the keel
aircraft axis.
8. AM-001 receiving and transmitting antenna with a radiation pattern of 360 in the horizontal plane and ±30 in the vertical plane. Designed for receiving and transmitting UHF signals during flights on international airlines. Located in the lower part of the fuselage, in the area of sp. No. 55 on the left. 1.2. CONTROLS
All controls for the transponder are located on the SO-63 control unit and ICAO.
The SO-63 control panel (Fig. 17) contains:
Switch SO-63 to turn on the transponder's power supply;
CONTROL button, to check the operability of the transponder from the built-in control circuit;
CONTROL lamp, to indicate the response and serviceability of the transponder;
SIGN button to turn on the individual identification signal;
WAVE switch for selecting fixed transponder frequencies;
Toggle switch EMERGENCY to turn on the emergency (distress) signal;
Work with secondary radars of RBS systems, the parameters of which meet the requirements:
1) RSP (on mode when working with PRL and DRL that do not have equipment for receiving information from the board);
2) ATC (on mode when working with DRL "Narva-S", "Ekran-2M", P-32, "Utes". The responder automatically transmits information about the aircraft number, or flight altitude and fuel reserve.
3) YaV5 (the mode is activated when flying over the State Border of the Russian Federation and is provided by ICAO).
4) 023M (mode not used).
The ICAO encoder control panel contains:- operating mode switch with four positions:
1) A (turned on to respond to a request for flight number with code A, for flight altitude with code C);
2) B (same as A, but the request for the flight number is carried out using code B);
3) C (turned on to respond to a request for flight altitude with code C);
4) READY (D) - a mode in which the transponder input is locked when it is fully prepared for operation
DIAL switches for dialing one of 4096 flight number codes;
MF toggle switch (turned on at the request of the dispatcher, if necessary, reduce the sensitivity of the main receiver in areas with a high density of ATC radars).
The SPU-7 intercom is designed for telephone intra-plane communication between crew members and for access to external radio communications through command radio stations RSIU-5, communication radio stations, as well as for access to receiving signals from the first and second sets of radio compass.
Auxiliary communication points installed in various compartments of the aircraft serve for communication between maintenance personnel when testing and setting up radio equipment and other aircraft components.
The intercom kit includes:
amplifier;
four subscriber units;
three splitter blocks;
eight four-contact buttons K-4M;
headband with TA-4 telephones and LA-5 laryngophones (four sets);
foot switch;
box 14-T start relay;
five half-connectors with cords for installing auxiliary call points in the places where the equipment is installed.
The SPU-7 amplifier has two push-pull low-frequency amplification stages, which use germanium triodes. Both push-pull amplifier stages are assembled according to a circuit with a grounded emitter and have a transformer connection with each other.
The schematic diagram of the amplifier is shown in Fig. 263. The amplifier has two push-pull low-frequency amplification stages, which use germanium triodes. Both cascades are assembled according to a circuit with a grounded emitter and have a transformer connection with each other. The first stage amplifies the power of the currents coming from the laryngophones through the input transformer 1 to the value necessary to excite the second stage.
The alternating voltage amplified by the first stage is supplied to the bases of the triodes of the second stage through a transition transformer 2, which serves to match the output resistance of the first stage with the input resistance of the second stage of the amplifier.
The alternating voltage of the signal, amplified by the second stage, is supplied through the output transformer 3 to the telephones of subscribers when operating via the aircraft’s internal communication network. From the primary winding of output transformer 3 through resistances 4 and 5, voltage is supplied to the emitters of the triodes of the first stage
negative feedback, which reduces nonlinear distortion when the amplifier's output load changes.
To smoothly control the gain, there is a variable resistance 6 connected in parallel with the secondary winding of the input transformer.
Subscribers' laryngophones receive power from the amplifier through pins 1 and 2 of connector 7. The plus of the laryngophone voltage is removed from the divider formed by resistances 8 and 9. Inductor 10 and capacitor 11 form a filter in the power supply circuit of the laryngophones, which serves to protect against interference from the aircraft's on-board network.
The aircraft's on-board network voltage is supplied to the amplifier circuit through pins 4 and 5 of connector 7. The filter, consisting of an inductor 12 and a capacitor 13, serves to protect against the penetration of interference from the aircraft's on-board network into the positive circuit of the power source.
To protect the amplifier circuit from incorrect connection of the polarity of the aircraft's on-board network, diode 14 is included in the positive power circuit. The output voltage of the amplifier is removed from pins 3 and 4 of connector 7. In the subscriber unit, the subscriber's laryngophones and telephones are switched for various types of communication, as well as switching of trigger circuits radio stations.
When you press the circular call button, the telephones of each subscriber switch to the output of the SPU-7 amplifier, remaining connected to the output of the receiver of their radio station. In this case, the signal of the receiver of its radio station is weakened in comparison with the signal transmitted through the internal communication circuit.
The laryngophones of the subscriber who pressed the circular communication button are connected through the contacts of this button to the input of the SPU-7 amplifier. The throatphones of all other subscribers remain connected to the types of communication to which they were connected before receiving the circular call.
When the circular call button is released, all subscribers return to the type of communication they were on before receiving the circular call. The broadcast call is answered via the intercom network.
To access internal communication, the subscriber either presses the “SPU” button when receiving and transmitting, or, by setting the “SPU - work” switch on the subscriber device to the “SPU” position, presses only when transmitting any of the “SPU” or “Transfer” buttons .
When a subscriber switches to internal communication, his phones are connected to the output of the SPU, remaining connected to the output of the receiver of his radio station. The subscriber's laryngophones are connected to the output of the SPU amplifier only when the “Transfer” or “SPU” button is pressed.
To regulate the volume of telephones on the subscriber unit there are two regulators. One of them (“Radio”) regulates the volume of listening to an external communication signal when working on an internal network or during a circular call, the other regulator sets the volume of the SCP. By means of connecting blocks, the wires coming to them from subscriber units and individual buttons are connected.
The SPU-7 kit includes two four-contact buttons of the K-4M type, which are used to simultaneously turn on two circuits. The “Transmission” button (for pilots it is called “Radio”) turns on the laryngophone chain and the radio station launch circuit, and the “SPU” button turns on the laryngophone chain. The foot switch duplicates the “Transmit” button installed on the radio operator and allows him to free his hands to take notes.
INTERCOMING DEVICE - DESCRIPTION AND OPERATION
1. General part
1.1. Intercom SPU-7 is designed for intra-helicopter telephone communication between
crew members, for pilots to communicate externally through three radio stations and two radios
compass and listening to special-purpose signals from voice warning equipment
"Almaz-UP" and radio altimeter A-0 37.
1.2. The intercom kit includes:
subscriber device - 3 pcs.;
amplifier SPU-7- 1 PC.
1.3. Intercom placement:
the SPU-7 amplifier is installed on frame No. 1 of the cargo compartment near the SPU RK (see 023.00.00, Fig. 1);
pilots' telephones are installed to the left and right of the gas station panels of the electric console (see 023.00.00, Fig. 1);
the subscriber unit is located on the left side of the cargo cabin between frames No. 6, No. 7. On a helicopter, the intercom operates additionally with two intercom points:
one additional communication point is installed in the cockpit door opening in a special niche on the right;
the second additional communication point is installed in the cargo compartment on the wall of frame No. 1 near the sliding door.
The SPU switching equipment is located in the distribution box of the SPU RK, installed on the wall of frame No. 1 - on the left.
The following equipment is associated with the SPU-7 intercom:
main and backup radio stations "Baklan-20";
communications radio station "Yadro-1G1";
voice communication equipment "Almaz-UP";
tape recorder P-5 03 B;
radio compass ARK- 15 M;
ARK-UD radio compass;
radio altimeter A-037.
INSTRUCTION MANUAL 102
2. Description
2.L Subscriber devices are designed to control the connection of microphones (laryngophones) and telephones of subscribers to various means of communication, as well as for switching the power circuits of starting relays of radio transmitters.
The necessary switching is carried out by a radio switch, a SGTU - RADIO switch, CV circular call buttons on subscriber sets and remote sequential switch buttons on the helicopter control handles (see 023.00.00, Fig. 1). The NETWORK 1 - 2 switch on the helicopter is paralleled, so it can be set to any position. Radio communication switches on the subscriber units of the left and right pilots carry out the following switching of radio equipment associated with the SPU:
UCR position - work on the command radio station "Baklan-20" (main);
SR position - work via the communications radio station "Yadro-1G1"; .
position of the Kyrgyz Republic - work via the command radio station "Baklan-20" (reserve);
DR position - not activated; "■■"""■ ~ -
RK1 position - listening to ARK-15 radio compass signals; RK2 position - listening to ARK-UD radio compass signals.
2.2. An additional talking point installed in the cockpit door opening, in a special niche, is intended for internal communication and listening to radio compass signals by the flight engineer. This additional point has an external SPU button and an ARK-SV - SPU - ARK-UKV switch, located on the bracket of the right shelf. The indicated button is connected in parallel with the LARING switch. additional communication point for on-board technicians, duplicates the action of this switch and is installed for ease of operation. The ARK-SV - SPU - ARK-UHF switch provides a choice of listening to one of three signals:
ARK-15M radio compass - in ARK-SV position; ARK-VHF radio compass - in the ARK-VHF position; listening to the SPU internal network - in the "SPU" position.
The additional intercom station contains: a volume control knob, a LARING switch, a circular call button CALL, a cord for connecting an aircraft headset.
There is a LARING switch installed on the right panel of the electric control panel. - ON, with its help the right pilot can, if necessary, connect his microphone or headset to the input of the SPU amplifier for a long time. Conducting a conversation in this case is carried out without pressing the PTT switch on the right pilot's control stick.
An external
LARING switch. - ON Its purpose and operation are similar to the LARING switch. -
ON on the right pilot's electric control panel, . ^
TECHNICAL OPERATION MANUAL
2.3. For the transition of pilots from work via internal communication to external communication and vice versa on each handle
helicopter control there is a sequential switching button SPU - RADIO type
2 gearboxes, when you press the trigger of which, before the first stage is triggered, it is possible to work in
"SPU" mode, and when pressed until the second stage is activated - work in the "Radio" mode
(external communication).
2.4. The intercom provides: -
Two-way intra-helicopter telephone communication between pilots and other crew members when
any positions of the SPU - RADIO switch and the radio communication switch on their subscriber
tsk devices when you press the trigger of the sequential switching button SPU - RADIO on
the helicopter control stick until the first stage is activated (SPU position). Wherein
the pilot simultaneously listens with a reduced volume to the receiver of the device on
which the switch of his subscriber device is installed. G
Pilots “start up” and modulate radio station transmitters in the radio communication switch positions: UKR, SR and KR when setting the SPU - RADIO switch on subscriber units to the RADIO position and pressing the trigger of the SPU - RADIO button on the helicopter control stick until the second stage is activated (RADIO position) . In this case, reception is carried out with full volume, and listening to the SPU is carried out with reduced volume.
Implementation by the right pilot and the operator of intra-helicopter communication without the pilot pressing the SPU-RADIO button on the control stick by setting the LARING switches, located respectively on the right panel of the pilots' electric console and next to the subscriber unit in the cargo compartment, to the ON position.
Implementation of continuous intra-helicopter communication from additional communication points when installing LARING switches. on the front panels of call points to the ON position. From the additional communication point of the flight technician, it is also possible to conduct short-term intra-helicopter communications by pressing the remote control button.
Implementation of internal circular telephone communication by each crew member by pressing the CV circular call button in any position of the switches on subscriber sets and additional call points. In this case, the subscriber listens with a reduced volume to the signal of the radio device to which the radio switch of the subscriber unit is installed.
Delivery of a voice message from the Almaz-UP equipment to the phones of the left pilot at full volume, regardless of the position of the switches on his subscriber unit.
Providing a “Dangerous Altitude” sound signal from the A-037 radio altimeter to the phones of the left pilot, regardless of the position of the switches on his subscriber unit.
At the flight engineer's workplace there is a PPG-15K switch with the SPU - ARK positions
for listening to ARK-15 M.
3.1. Intercom power supply
Purpose. The SPU-9 aircraft intercom is designed for two-way intra-aircraft telephone communication between two crew members, the crew members accessing external radio communications via a radio station, listening to radio compass signals, as well as the “Dangerous Altitude” signals of the RV-5 radio altimeter, the “Marker” of the marker radio receiver and "Dangerous speed."
The aircraft intercom works with an aviation headset AG-2 (GSSH-A-18), containing high-impedance telephones TA-56M and an electrodynamic microphone DEMSH-1, or with an aviation headset containing high-impedance telephones TA-4 and laryngophones LA-5.
The design of the SPU-9 aircraft intercom provides at least 90% of verbal speech intelligibility when receiving and transmitting in acoustic noise up to 120 dB when working with laryngophones and TA-56M telephones.
The SPU-9 device on the Yak-18T aircraft provides:
simultaneous listening by each subscriber with 100% volume of transmissions carried out over the external and internal communication network, as well as signals: radio compass (when the “RK-Off” switch is set to the “RK” position on the subscriber panel), “Dangerous altitude” from radio altimeter, marker receiver (when installing the landing equipment “Axis-1” - marker and directional receivers), “Dangerous speed”;
intra-plane telephone communication between two crew members when one of the “SPU” buttons located on the control wheel is pressed by any of the crew members;
starting and modulating the radio transmitter of the command radio station by pressing one of the “Radio” buttons located on the steering wheels;
crew members receiving radio compass signals;
disconnecting the second subscriber's laryngophones from the radio station input when the first subscriber starts transmitting through the same radio station;
the ability to reserve the isolation amplifiers of both subscribers by switching the phones of the first subscriber to the output of the isolation amplifier of the second subscriber in parallel with his phones, or, conversely, by setting the “Res-Off” switch located on the subscriber panel to the “Res” position;
Rice. 101. SPU-9 device set: 1 - amplifier block; 2-subscriber shield
smooth separate control of the volume of speech transmitted over the internal communication network by the SPU volume control, and through the external communication network - by the RAD volume control. Signals entering the SPU from the ARK-9 (or ARK-15) radio compass, MRP-56P marker receiver, RV-5 radio altimeter and “Dangerous speed” into the SPU system have no adjustment. The volume of the MRP signals “Dangerous height” and “Dangerous speed” is adjusted by a potentiometer located on the radio equipment relay panel. The shield is installed in the radio equipment compartment between frames No. 12 and 13.
