26-11-00
 ALL  ú ú 09 Page 527 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 ENGINE FIRE AND OVERHEAT DETECTOR - REMOVAL/INSTALLATION
________________________________________________________
 1.  General
_______
 A.  This procedure contains four tasks. The first task removes the engine fire detector element. The second task installs the engine fire detector element. The third task removes the engine fire detector assembly TS681, TS682, TS683, and TS684. The fourth task installs the fire detector assembly.
 B.  There are four detector assemblies, TS681, TS682, TS683, and TS684, installed in each engine. The assemblies are the upper forward engine overheat, upper aft, lower aft, and lower forward engine fire detectors. The removal/installation procedure is the same for all detectors.
 C.  To get access to the detector assemblies, open the thrust reverser.
 TASK 26-11-02-004-001
 2.  Remove the Engine Fire and Overheat Detector Element (Fig. 401)
____________________________________________________
 A.  References
 (1)
AMM 71-11-06/201, Core Cowl Panels

 (2)
AMM 78-31-00/201, Thrust Reverser System

 (3)
SWPM 20-10-14 - Installation of Shrinkable Sleeves

 (4)
SWPM 20-00-12 - Contact Crimp Tool Cross Reference.

 (5)
IPC 26-11-02 Fig.2

 (6)
WDM 26-11-11 thru 26-11-43

 (7)
SSM 26-11-01 thru 26-11-04

 B.  Access
 (1)  
Location Zones
 412 Engine 1
 422 Engine 2
 432 Engine 3
 442 Engine 4

 (2)  
Access Panels
 415 Left Thrust Reverser Half - Engine 1
 416 Right Thrust Reverser Half - Engine 1
 417 Left Core Cowl - Engine 1
 418 Right Core Cowl - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 426 Right Thrust Reverser Half - Engine 2
 427 Left Core Cowl - Engine 2
 428 Right Core Cowl - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 436 Right Thrust Reverser Half - Engine 3
 437 Left Core Cowl - Engine 3
 438 Right Core Cowl - Engine 3
 445 Left Thrust Reverser Half - Engine 4
 446 Right Thrust Reverser Half - Engine 4
 447 Left Core Cowl - Engine 4
 448 Right Core Cowl - Engine 4

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-11-02
 ALL  ú ú 04 Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Prepare for the Removal
 S 864-002
 (1)  For removal of the engine fire and overheat detector elements, open the applicable circuit breakers as shown in Fig. 401 and attach DO-NOT-CLOSE tags.
 S 014-022
 WARNING: YOU MUST OPEN THE THRUST REVERSER BEFORE YOU OPEN THE CORE COWL
_______ TO PREVENT DAMAGE TO THE REVERSER OR THE COWL. MAKE SURE YOU FOLLOW THE PROCEDURE IN 78-31-00/201 WHEN YOU OPEN THE THRUST REVERSER. IF YOU DO NOT FOLLOW THIS PROCEDURE, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (2)  
Open the applicable thrust reverser half and core cowl half to get access to the detectors (AMM 78-31-00/201 and AMM 71-11-06/201).

 D.
Procedure

 S 034-004
 (1)  Remove the screws (6), washers (8), and nuts (9) on each end of the detector elements to disconnect the T681, T682, T683, or T684 terminal lugs (10).
 S 034-005
 CAUTION:_______DO NOT TWIST OR BEND THE DETECTORS WHEN YOU REMOVE THEM. THIS CAN CAUSE DAMAGE TO THE DETECTORS.
 (2)  
Remove the retaining nuts (4) which hold the detector element (3) at the support tube end bracket (5) at each end of the detector.

 (3)  
Loosen the stud (13) to open the quick release clamp (1).

 (4)  
Remove the terminal lugs (10) from the end brackets (5).

 S 344-062
 S 034-006
　
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