EffectivityALLALL
ALLALL
ALL
ALL
ALL
23-CONTENTS
GUN Page 9 May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL CHAPTER 23 - COMMUNICATIONS TABLE OF CONTENTS
_________________
Chapter
Section
Subject_______ Subject_______ Page____ Effectivity___________
Adjustment/Test 501 ALL
Bulk Erasure Test - Voice 506
Recorder System
Operational Test - Voice 501
Recorder Control Panel
System Test - Voice Recorder 503
System
BEACON - UNDERWATER LOCATOR 23-71-03
Maintenance Practices 201 ALL
Underwater Locater Beacon 201
Removal
Underwater Locator Beacon - 212
Installation
Underwater Locator Beacon - 210
Operational Test
Underwater Locator Beacon 205
Battery Replacement
PANEL - VOICE RECORDER CONTROL 23-71-02
Removal/Installation 401 ALL
RECORDER - VOICE 23-71-01
Removal/Installation 401 ALL
23-CONTENTS
GUN Page 10 Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
COMMUNICATIONS - DESCRIPTION AND OPERATION
__________________________________________
1. General_______
A. The 757 airplane has facilities for transmitting and receiving voice communications from ground stations or other airplanes. Facilities are also available for communication within the airplane.
2. Communications Systems (Fig. 1)______________________
A. Two HF communication systems (23-11) are installed on the airplane.
(1) The HF communication system, provides long-range voice communication with ground stations or other airplanes. The system can be used to transmit or receive after selection of an operating frequency and mode.
B. Two VHF communications systems (23-12) are installed on the airplane.
(1) The VHF Communication system provides short range, line-of-sight
A.M. voice communications with ground stations or other airplanes.
C. A five channel SELCAL system (23-21) is installed on the airplane. The system provides aural/visual notification to the flight crew that someone desires contact with them on one of the radio transceivers, and makes continuous monitoring of radio frequencies unnecessary.
D. The PA (passenger address) system (23-31) provides the pilots and attendants with a way to distribute announcements and boarding music to passengers through cabin speakers. Circuits in the system send chime signals to the cabin speakers.
E. GUN 008-999; the passenger entertainment (video) system (23-32) provides prerecorded video programs for passenger viewing. The programs are displayed on monitors located throughout the passenger cabin.
F. GUN 008-999; the passenger entertainment system (23-34) provides entertainment audio to the passenger seats. Entertainment audio is provided by either the entertainment tape (music) or video tape reproducers.
G. The service interphone system (23-41) provides the staff and crew with interior and exterior communication capability. Circuits in the system connect service interphone jacks to the flight compartment.
H. The cabin interphone system (23-42) provides facilities for communication among cabin attendants, and between the flight compartment crewmembers and attendants. The system can be switched to the input of the passenger address system for PA announcements.
I. The ground crew call system (23-43) provides a signaling capability (through the ground crew call horn) between the flight compartment and nose landing gear area.
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