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AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - ADJUSTMENT/TEST
____________________________________________________________
 1.  General
_______
 A.  This task does an operational test of the airborne vibration monitoring
 (AVM) system.

 B.  To do an operational test of the AVM system, you must start and operate
 all four engines.

 C.  Do this test to make sure the AVM system operates correctly if you
 replace the AVM signal conditioner, the accelerometer, or related wires.

 TASK 77-31-00-715-021-N00
 2.  Airborne Vibration Monitoring (AVM) System Operational Test (Fig. 501)
___________________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 31-61-00/501, Integrated Display System

 (3)  
AMM 32-09-02/201, Air/Ground Relays

 (4)  
AMM 71-00-00/201, Power Plant

 (5)  
AMM 71-11-04/201, Fan Cowl Panels

 (6)  
WDM 77-12-11, 77-12-12, 77-12-13, 77-12-14, 77-12-21, 77-12-22

 (7)  
WDM 77-12-23, 77-12-24, 77-31-11, 77-31-12

 (8)  
SSM 77-31-01

 B.  
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 C.  
Preconditions

 S 865-025-N00
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System serviceable (AMM 31-61-00/501).

 (c)  
Airplane must be in the Ground Mode (AMM 32-09-02/201).

 (d)  
The engine must be operational (AMM 71-00-00/201).

 D.  
Procedure

 S 865-022-N00
 (1)  Operate the engines at the same power.
 (a)  
Start the engines (AMM 71-00-00/201).

 (b)  
Make sure that these engine indications become stable and are approximately the same value for all the engines: 1) N1 2) N2 3) EGT 4) EPR.

 S 715-001-N00
 (2)  Make sure that the VIB indications on the auxiliary EICAS display show satisfactory vibration levels for each engine (AMM 71-00-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

AUXILIARY EICAS DISPLAY  PERFORMANCE MAINTENANCE PAGE

Engine Vibration Indication
Figure 501

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S 865-023-N00
 (3)  Stop the engines (AMM 71-00-00/201).
 TASK 77-31-00-715-042-N00
 3. Universal Airborne Vibration Monitor (AVM) Signal Conditioner - Self Test
_________________________________________________________________________
 A. General
 (1)  
AIRPLANES WITH THE VIBRO-METER UNIVERSAL AVM (S362A001); This task is the self-test procedure for the Universal Airborne Vibration Monitor (AVM).

 (2)  
This procedure refers to the Built-In Test Equipment as the BITE.

 (3)  
The self-test does a check of the AVM signal conditioner.

 (a)  
The self-test makes sure that the AVM signal conditioner operates correctly.

 (b)  
The self-test does not display BITE maintenance messages or flight history.
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 發動機指示 ENGINE INDICATING(64)