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 1.  General_______
 A.  This procedure contains two tasks. These tasks remove and install the overheat detector elements for the wheel wells, M691, M692, M693, and M694 (referred to as the detectors in this procedure).
 B.  Examine the detectors before and after the installation for bends less than the minimum bend radius of 1 inch. You must examine the detectors for no bends more near than 1 inch to the clamps and the flange assemblies. The dielectric material in the detector can change values if the bend radii are less than 1 inch. The dielectric material can also change values if the detector is stressed.
 C.  The detectors are found on the ceiling of the wheel well. Access to the detectors is easy since the wheel well will be open when the airplane is on the ground.
 TASK 26-17-02-004-001
 2.  Remove the Detector (Fig. 401)___________________
 A.  References
 (1)  
32-00-00/201, Landing Gear

 (2)  
32-00-30/201, Landing Gear Door Locks

 (3)  
IPC 26-17-02 Fig.02

 (4)  
WDM 26-17-11, Wheel Well Fire Detection

 (5)  
SSM 26-17-01

 B.  Access
 (1)  
Location Zone
 135 Wing Landing Gear Well L.H.
 136 Wing Landing Gear Well R.H.
 137 Body Landing Gear Well L.H.
 138 Body Landing Gear Well R.H.

 (2)  
Access Panel 731 Wing Landing Gear - Center Section Inboard Left 732 Wing Landing Gear - Center Section Outboard Left 741 Wing Landing Gear - Center Section Inboard Right 742 Wing Landing Gear - Center Section Outboard Right

 751 Landing Gear - Aft Inboard Left 752 Landing Gear - Aft Outboard Left 753 Landing Gear - Forward Inboard Left 754 Landing Gear - Forward Outboard Left 761 Landing Gear - Aft Inboard Right 762 Landing Gear - Aft Outboard Right 763 Landing Gear - Forward Inboard Right 764 Landing GEar - Forward Outboard Right
 C.  Procedure
 S 864-002
 (1)  Make sure the ground locks for the nose and main landing gear are installed (32-00-00/201).
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 26-17-02
 ALL  ú ú 01 Page 401 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE A
SEE B
FWD 
SEE  C 
INBD 
A 
SCREW 
SENSING ELEMENT  CLAMP B  GROMMET  FLANGE ASSEMBLY 
ELECTRICAL CONNECTOR  SENSING ELEMENT 
C 
Figure 401 Wheel Well Overheat Detector Element Installation 

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 26-17-02
 ALL  ú ú 01 Page 402 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 494-003
 WARNING: MAKE SURE THE DOOR LOCKS ARE INSTALLED ON THE NOSE AND MAIN
_______ LANDING GEAR (REF 32-00-30-201). FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Install the door locks on the wing and body landing gear (Ref 32-00-30/201).

 S 864-004

 (3)  
Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:

 (a)  6C7, W/W FIRE DET AC
 S 034-005
 (4)  
Remove the lockwires and the electrical connectors DM691, DM692, DM693, and DM694 from the two ends of the detector fitting.

 S 424-030

 (5)  
Install the end caps on the electrical connectors.

 S 034-006

 (6)  
Start at one of the ends and release the clamps along the length of the detector.

 NOTE: Use the minimum bends to install the detector.
____
 S 034-007
 (7)  
Remove the last electrical connector from the detector element.

 S 024-008

 (8)  
Remove the detector end fitting from the flange fitting.

 NOTE: You can let the used detector stay to make the installation
____ easy for the new detector. It will be held in its position by the support tubes and the mounting brackets.
　
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