23-43-01
 ALL  ú ú 01.1 Page 403 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 424-013
 (4)  
Use three screws to install the ground crew call horn with the drain hole to the bottom.

 S 434-015

 (5)  
Install the pilots' call panel (Ref 23-42-02).

 S 864-016

 (6)  
Remove DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:

 (a)  
11A32, INDICATOR LIGHTS 1

 (b)  
11C23, INTERPHONE CABIN SERVICE

 (c)  
11H31, GND CALL

 F. Ground Crew Call Horn Installation Test
 S 864-018
 (1)  
Supply electrical power (Ref 24-22-00).

 S 984-029

 (2)  
Push the GND CALL switch on the pilots' call panel (M51).

 S 284-030

 (3)  
Make sure you hear the horn.

 G. Put the Airplane Back to Its Usual Condition
 S 014-031
 WARNING:_______USE THE PROCEDURE IN 32-00-15 TO REMOVE THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Remove the door locks from the nose gear doors and close the doors (Ref 32-00-15).

 (2)
Remove electrical power if it is not necessary (Ref 24-22-00).

 S 864-019
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 23-43-01
 ALL  ú ú 01 Page 404 ú Sep 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 FLIGHT INTERPHONE SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________
 1.  General_______
 A.  The flight interphone system provides facilities for interphone communication among flight compartment crewmembers and provides the means for them to key, transmit, and receive on airplane radio systems and receive on airplane navigation systems.
 B.  The flight interphone system extends communication to ground personnel at the nose gear interphone station, and allows flight compartment crewmembers to make passenger address announcements and communicate.
 C.  The flight interphone system includes amplifiers and mixing circuits in the audio accessory unit, audio selector panels, cockpit speakers, microphone/headphone jacks and push-to-talk (PTT) switches.
 D.  The captain's and the first officer's flight interphone components include the following: audio selector panel; headset, headphone, and handmic jacks; audio selector panel and control wheel push-to-talk (PTT) switches; and cockpit speakers.
 E.  The observer's flight interphone components include the following: audio selector panel; headset, headphone and handmic jacks; and audio selector panel PTT switch.
 F.  GUN 051; The supernumerary flight interphone components are the same as the first observers.
 G.  The flight interphone system receives power from the dual power source of 28v dc battery bus and 28v dc right bus, through circuit breakers on overhead panel P11.
 2.  Component Details (Fig. 1)_________________
 A.  Audio Accessory Unit
____________________
 (1)  The flight interphone amplifier is located in the audio accessory unit (E4 rack in the main equipment center). The amplifier is a printed circuit card which receives microphone inputs and provides audio to all flight interphone stations. The amplifier has preset internal adjustments for compression squelch and volume. Adjustments to the unit are not accessible.
 B.  Audio Selector Panel
____________________
 (1)  GUN 001-010, 101-107, 201-203; Audio selector panels are located in the flight compartment. Two audio selector panels are on the P8 control stand, and one is on the first observer's P17 sidewall console. 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.
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