28V DCBAT BUS
INTERPHONE
CAPT - DUAL PWR
AUDIO INA +28V28V DCA HOT MIC
R BUSINTERPHONE
VOICE
CAPT - DUAL PWR
RECORDER P11 FLT INTPH RANGE
2
R/T
BOTH
SPKR MUTESW
VOICEF
INTPH CAPT COCKPIT SPEAKER
RID
INTPH SW 1
BL
CROSSMUTEV
T
CAPT CONT4 E
R
WHEEL SW R
BV
3 FLT INTPHR/T FLT INTPH
JACK FROMRESTCOMPRESSOR
FLT INTPHOF
SQUELCH C
ASP'S COMPRESSORFROMREST
HEADPHONE JACK CAB INTPH
CAB INTPHCAB INTPH
SQUELCH BBOOM MIC JACK OF
ASP'S
SERVICEJACK PANEL
PTTAUDIO
A POWERINTPH JACKMIC
INPUT SUPPLY PA AMPLIFIER AUDIO ACCESSORY UNIT
PASS ADRSHAND MIC JACK PTTAUDIOMIC
INPUT PTT OXY/BOOM
OXY MASK MIC HF COMM XCVR
HF
C
FLT INTPH
CAB INTPHB PTTAUDIO
PASS ADRS
MIC
INPUT
HF
VHF
VHF COMM XCVR
VHF
AUDIOMKR
VHF MIC
INPUTS
RESETMKR
SELCAL PNLHF ADF
DME(VOR)
ADF
VOR1 RELAY INSTALLED GUN 004-999 AND AIRPLANES
VOR
1 HAVING AUDIO SELECTOR PANELS (ASP'S) WITH
ASP COMPONENT SB 285T0022-23-04
DME(ILS)
ILS
ILS
CAPT AUDIO SELECTOR PANEL
Flight Interphone System SchematicFigure 2 (Sheet 1)
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23-51-00
ALL ú ú 11 Page 5 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
U5506
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
23-51-00
ALL ú ú 01 Page 6 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(5)
GUN 051; The first observer's and the supernumerary's flight interphone components and operation are the same as the captain's except for the absence of a control wheel push-to-talk switch and cockpit speaker.
(6)
The flight interphone components, which include microphones and audio amplifiers, provide the connecting link between airplane communication systems, navigation receivers, and flight compartment crewmembers. Audio selector panels enable crewmembers to transmit and receive over the radio systems, or receive over the navigation systems. Microphone PTT switches on the audio selector panels enable flight compartment crewmembers to send messages using the various microphones (boom, hand, and oxygen mask). These messages are transmitted over the flight and cabin/service interphone systems, radio systems, and passenger address system. The interphone, radio communication, and navigation systems audio outputs are sent to the cockpit speakers, headsets and voice recorder.
(7)
The audio selector panel microphone select switches are used with the microphones and PTT switches to transmit over any radio system or the flight interphone system. The push-to-talk switch energizes the microphone circuit selected by the microphone select switches and also keys transmitter circuits if radio systems are selected. Amplifiers, summing networks, and filters in the audio selector panel provide audio signals from the interphone and radio communication systems to the headphones and speakers. Audio signals from the navigation receivers are also monitored through the headphones and speakers. Reception of all audio signals is controlled by the volume switches. The captain's INT microphone switch is lighted when on. The switch is interlocked with the other microphone switches so that they can only be pushed one at a time.
(8)
The navigation systems (ADF, VOR, ILS, MKR) audio is controlled by switches on the audio selector panel. The left, center, or right (L, C, R) switches control selection and volume of the desired receiver. The VOICE-BOTH-RANGE switch is a filter control that separates voice signals and range signals. The filter switch can also combine both voice and range signals. All radio communication, interphone, and navigation outputs are received and recorded by the voice recorder.
(9)
ON SOME AIRPLANES (See Fig. 2 for effectivity). the VOICE-BOTH-RANGE (V-B-R) switch also controls a DME muting relay in the audio selector panel. When VOR audio (L or R) is selected on the audio selector panel, placing the V-B-R switch in VOICE position will energize a relay which mutes all DME audio.
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