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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
FIRST OFFICER'S P11 PANEL
CONTROL WHEEL FIRST OFFICER'S COCKPIT SPEAKER

P61 PANEL
SECOND OBSERVER'S HEADSET JACK

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

FIRST OBSERVER'S JACK PANEL (EXAMPLE)
SECOND OBSERVER'S
C
HEADSET JACK (EXAMPLE)
D
Flight Interphone System - Component Location
Figure 1 (Sheet 2)

C75887
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

 (2)  GUN 051; Audio selector panels are located in the flight compartment. Two audio selector panels are on the P8 control stand, one is on the first observer's P17 sidewall console, and one is at the supernumerary's station on the P61 right side panel. Each panel contains microphone selector switches which connect microphone circuits to the interphone systems, to the radio communication systems, or to the passenger address system. The push-to-talk (PTT) switch on the panel keys the flight compartment microphones. Volume control is provided by switches on the panel.
 C. Cockpit Speakers
________________
 (1)  Two cockpit speakers are in the flight compartment. The captain's speaker is on the P13 sidewall panel and the first officer's speaker is on the P14 sidewall panel. The unit contains a loudspeaker, amplifier, muting circuits, and a volume control. The speakers receive all audio signals provided to the audio selector panels. The speakers are muted whenever a PTT switch is pushed at the captain's or first officer's station. Volume is adjusted by a knob in the center of the speaker.
 D. Flight Interphone Jack Panels
_____________________________
 (1)  
GUN 001-010, 101-107, 201-203; The captain, first officer, and observer each have a jack panel for a boom mic, headset and handmic.

 (2)  
GUN 051; The captain, first officer, observer, and supernumerary stations each have a jack panel for a boom mic, headset and handmic.

 (3)  
A headset jack for a second observer is located at the P61 panel.

 E. Push-To-Talk (PTT) Switch
_________________________
 (1)  Push-to-talk (PTT) switches are located at all flight interphone stations. The handmic, control wheel, and audio selector panels all have PTT switches. The switch must be pushed before messages are begun or no transmission can take place. Audio and control circuits to the audio selector panel are completed when the PTT switch is pushed.
 3. Operation (Fig. 2)
_________
 A. Functional Description
______________________
 (1)  
The flight interphone system is the communication link between flight compartment crewmembers. The system provides common microphone circuits for the communications systems and common headphone and speaker circuits for the communications and navigation systems.

 (2)  
The captain's and first officer's flight interphone components and operation are the same.

 (3)  
The observer'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.

 (4)  
GUN 001-010, 101-107, 201-203; The observer'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.

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