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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
AUDIO ACCESSORY UNIT - REMOVAL/INSTALLATION
___________________________________________
1. General_______
A. The audio accessory unit, M108, is on rack E4-3 in the main equipment center.
B. This procedure contains two tasks. The first task removes the audio accessory unit. The second task installs the audio accessory unit and does a test of the installation.
TASK 23-42-01-004-001
2. Remove the Audio Accessory Unit_______________________________
A. References
(1) AMM 20-10-01/401, E/E Rack Mounted Components
B. Access
(1)
Location Zones
119/120 Main Equipment Center
211/212 Flight Compartment
(2)
Access Panel
119BL Main Equipment Center
C. Remove the Audio Accessory Unit
S 864-002
(1) Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11C22, PASS ADRS AMPL
(b)
11C23, INTERPHONE CABIN SERVICE
(c)
11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 1 DUAL PWR
(d)
11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR
(e)
11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR
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757 MAINTENANCE MANUAL
(f) 11G30, INTERPHONE F/O OBS
or
INTERPHONE FLT AMPL ASP 1 R PWR
S 024-005
(2) Remove the audio accessory unit (AMM 20-10-01/401).
TASK 23-42-01-404-006
3. Install the Audio Accessory Unit________________________________
A. References
(1)
AMM 20-10-01/401, E/E Rack Mounted Components
(2)
AMM 24-22-00/201, Electrical Power - Control
B. Access
(1)
Location Zones
119/120 Main Equipment Center
211/212 Flight Compatment
221/222 Passenger Cabin - Section 41
(2)
Access Panel
119BL Main Equipment Center
C. Install the Audio Accessory Unit
S 424-007
(1)
Install the audio accessory unit (AMM 20-10-01/401).
S 864-008
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11C22, PASS ADRS AMPL
(b)
11C23, INTERPHONE CABIN SERVICE
(c)
11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 2 DUAL PWR
(d)
11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR
(e)
11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR
(f)
11G30, INTERPHONE F/O OBS or 11G30, INTERPHONE FLT AMPL ASP 2 R PWR
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757 MAINTENANCE MANUAL
D. The Test of the Audio Accessory Unit
S 864-011
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-013
(2)
Push the PILOT switch on the forward attendant handset.
S 714-014
(3)
Make sure the light in the FWD switch on the pilots' call panel, P5, comes on.
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