S 414-051

 (2)  
Close the access panel for the aft equipment center near door 5.

 S 864-006

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P415 Power Distribution Center - Right
 1) 415L36, FLT RCDR AC

 S 714-012
 (4)  Do an operational test of the Flight Data Recorder System (AMM 31-31-00/501).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 31-31-01
 ALL  ú ú 18 Page 403 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLIGHT RECORDER ACCELEROMETER - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  Two tasks are in this procedure. The first task is the removal of the flight recorder accelerometer. The second task is the installation of the accelerometer. The installation task includes a test to make sure the accelerometer is installed correctly.
 B.  The accelerometer measures vertical, lateral and longitudinal acceleration for the flight recorder system. The accelerometer gets 28 volts dc from the FLT RCDR DC circuit breaker on the DC Power Distribution Panel (P180).
 C.  The accelerometer is installed on a bracket in the wheel well for the right wing gear (approximately at STA 1310, WL 175 and RBL 4). This location is near the airplane's center of gravity.
 TASK 31-31-03-004-001
 2.  Flight Recorder Accelerometer Removal (Fig. 401)_____________________________________
 A.  References
 (1)  32-00-30/201, Landing Gear Door Locks
 B.  Access
 (1)  
Location Zone
 136 Wing Landing Gear Well, RH

 (2)  
Access Panel 731L Wing Landing Gear Door - Center Sec Inboard

 C.  Procedure
 S 864-027
 WARNING: MAKE SURE THAT THE GROUND LOCKS ARE INSTALLED IN ALL OF THE
_______ LANDING GEAR. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  Make sure the ground locks are installed in the nose and main landing gear (AMM 09-11-00/201).
 S 864-028
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Open the doors for the landing gear and install the door locks (AMM 32-00-30/201).

 S 864-004

 (3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P180 DC Power Distribution Center
 1) 180J26 FLT RCDR DC

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 ALL  ú ú 01 Page 401 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE  A 
THREE (3) AXIS ACCELEROMETER  WASHER MOUNTING SCREW (3 LOCATIONS) 
(2 LOCATIONS) CLIP NUT
FWD 
NUT SELF-LOCKING 

A
Flight Recorder Accelerometer Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 402 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 034-005
 (4)  
Disconnect the DX393 electrical connector from the accelerometer.

 S 034-006

 (5)  
Remove the three screws and one washer that hold the accelerometer to the bracket.

 S 024-007
 CAUTION:_______BE CAREFUL WITH THE ACCELEROMETER. IT CONTAINS EASILY DAMAGED COMPONENTS.
 (6)  Carefully remove the accelerometer.
 TASK 31-31-03-404-008
 3.  Flight Recorder Accelerometer Installation (Fig. 401)__________________________________________
　
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