737-300/400/500MAINTENANCE MANUAL
PRESS-TO-TALK SWITCH
HANDHELD MICROPHONE HEADPHONE
HEADBAND
EARPIECE
TRANSDUCERS AMPLIFIER
ACOUSTIC
TUBE
HEADSET WITH BOOM MICROPHONE OXYGEN MASK 1
1
SMOKE MASK IS SIMILAR TO
OXYGEN MASK BUT HAS
COMPLETELY ENCLOSED FACEPIECE
Flight Interphone Microphones and Headphones Figure 2
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ALL ú ú 02 Page 4 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PA SPEAKERS
PA AMPL
PWR
CAPT SPEAKER SERV/ATT INPH &
CAPT R/T/INT PTT
WARN
ON CONTROL WHLFLT INPH CABIN/SERVICE
CAPT'S AMPL AMPL DATA BUS & POWER ASP
CAPT OXY MASK
F/O
OBS
P6
REMOTE ELECTRONICS F/O R/T/INT PTT UNIT ON CONTROL WHL
F/O DATA BUS & POWER
ASP RADIO XCVRS & NAV RADIOS OXY MASK
COCKPIT VOICE DATA BUS & POWER
OBSRECORDER
ASP OXY MASK
(E2-1 ELECTRONIC SHELF)
JACKS
JACKS
ATTENDANT HANDSETS
ALT ALERT
SERVICE
JACKS
AUX INPUTS
GND PROX FLT INPH NOSE
RADIO ALT WHEEL JACK
Flight Interphone Block Diagram
Figure 3 (Sheet 1)
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AUDIO CONTROL SYSTEM ú ú 02 Page 5 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
JACKS
BOOM MIC
HEADPHONE
OVERHEAD OXY MASK MIC
SPEAKER
HAND MIC COMM RADIOS
CONTROL
WHEEL
CAPTAIN'S
FROM NAV RADIOS AUDIO SELECTOR PTT TO VOICE RECORDER
EXT PWR PANEL FLT INPH JACK BOOM MIC
HEADPHONE OVERHEAD SERVICE
SPEAKEROXY MASK MIC
INTERPHONE SYSTEM HAND MIC
TO FLIGHT RECORDER
CONTROL FLTWHEEL
FIRST OFFICER'S INPHPTT
AUDIO SELECTOR AMPL
SERVICE INPH AMPL
AUDIO
ACCESSORY HEADPHONE BOOM MIC UNIT
OXY MASK MIC
HAND MIC
2ND OBS HEADPHONE
OBSERVER'S
AUDIO SELECTOR
PA AMPLIFIER
EE AUDIO AUDIO INTEGRATING
SELECTOR ELECTRONIC SHELF
PROVISIONS
Flight Interphone Block Diagram
Figure 3 (Sheet 2)
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AUDIO CONTROL SYSTEM ú ú 02 Page 6 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(2)
(3)
(4)
(5)
A
737-300/400/500MAINTENANCE MANUAL
(b)
The microphone selector switches are momentary contact switches. The switches are mechanically and electronically interlocked to permit only one switch to be selected at a time. A light in each switch comes on when the switch is selected, and the related receive audio channel will become active.
Volume Control Switches
(a)
The volume control switches are located directly below each microphone selector switch. The switches are turned ON/OFF by pushing the switch knob. The switches control the selection and volume level of the received audio. The control switches turn clockwise for increasing volume and counterclockwise for decreasing volume.
R/T - I/C PTT Switch
(a)
The R/T - I/C PTT switch is a system keying switch. When in the R/T position, the switch will key the communication system selected by the microphone selector. When in the I/C position the switch will key the flight system into transmit regardless of the microphone selection. The switch is spring loaded to center off.
(b)
The PTT switch on the ASP is connected in parallel to the PTT switch on the control wheel which serves a similiar function.
(c)
The flight deck speakers are muted when the microphone with the exception of the oxygen mask microphone is keyed at the audio selector panel, at the control wheels, or at the hand microphone.
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