26-17-02
 ALL  ú ú 01 Page 405 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 734-024
 (15)
 Do the test for the overheat detection system on the wheel well (Ref 26-17-00/501).

 S 864-025

 (16)
 Remove the door locks from the wing and body landing gear, if they are not necessary (Ref 32-00-30/201).

 S 864-029

 (17)
 Remove the ground locks from the wing and body landing gear, if they are not necessary (Ref 32-00-00/201).

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 26-17-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WHEEL WELL OVERHEAT DETECTOR ELEMENT - INSPECTION/CHECK
_______________________________________________________
 1.  General_______
 A.  This procedure has a check of the elements of the wheel well overheat detectors (referred to as the detectors in this procedure).
 B.  The detectors are in support tubing and attach to the top firewall by teflon-impregnated asbestos bushings. Make a note of all worn areas, cuts or other damage on the elements and support tubing. These types of damage are causes of internal damage to the element and failure of the bushings.
 C.  If the detector is bent too many times, it will change the dielectric value of the element materials. Correctly installed detectors are free from nicks, moisture, or fluid contamination.
 D.  The detectors are found on the ceiling of the wheel well. Access to the detectors is easy since the wheel well door will be open when the airplane is on ground.
 TASK 26-17-02-206-001
 2.  Do a Check of the Detector Element (Fig. 601)__________________________________
 A.  References
 (1)
AMM 09-11-00/201, Ground Locks

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

 (3)
IPC 26-17-02 Fig. 2

 (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
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 26-17-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

DETECTORS FOR
WHEEL WELL
OVERHEAT

SEE A
SEE B
FWD
SEE C
INBD
A
SCREW
GROMMET
DETECTOR ELEMENT
CLAMP
FLANGE ASSEMBLY
B
DETECTOR ELEMENT
ELECTRICAL CONNECTOR
C
Check of the Detector Element for Wheel Well Overheat
Figure 601

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 26-17-02
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