26-15-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 APU FIRE DETECTOR - INSPECTION/CHECK
____________________________________
 1.  General_______
 A.  This procedure contains one task - to examine the APU fire detector elements.
 B.  You will find the detector elements on the left APU access door and near the aft APU mount. If the elements or the support tubing are damaged, the system will not operate correctly.
 C.  Get access to the APU fire detectors through the access doors below APU.
 TASK 26-15-02-206-001
 2.  Examine the APU Fire Detector Elements (Fig. 601)______________________________________
 A.  Consumable Materials
 (1)  
B00338 - Cleaner, Acetone

 (2)  
B00543 - Cleaner, Methyl Alcohol

 B.  References
 (1)  
26-15-02/401, APU Fire Detector Element

 (2)  
IPC 26-15-02 Fig.02

 C.  Access
 (1)  
Location Zone
 317 APU Compartment L.H.
 318 APU Compartment R.H.

 (2)  
Access Panel
 317A Door-Access-APU
 318A Door-Access-APU

 D.  Procedures
 S 046-002
 (1) Open these circuit breakers and attach a DO-NOT-CLOSE tag:
 (a)  P6 Main Power Distribution Panel 1) 6C5 ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT 2) 6C6 FIRE SW UNLOCK 3) 6H14 APU FIRE/BLD DUCT OVHT LOOP A 4) 6H15 APU FIRE/BLD DUCT OVHT LOOP B
 S 016-003
 (2)  Open the APU access doors:
 (a)  Open the latches on the APU access doors.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-15-02
 ALL  ú ú 05 Page 601 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  
Open the APU access doors.

 (c)  
Engage the support rods for the APU access doors.

 S 216-004
 (3)  Do these steps to visually examine the support tubing:
 (a)  
Make sure that they are attached tightly in their correct position.

 (b)  
Examine the support tube for dents on the surface.

 NOTE: Small dents, as much as 0.06 inch depth, are permitted.
____
 (c)  
Make sure that the support tubes do not have cracks, sharp edge nicks (go thorugh the tube wall), or compressed areas.

 (d)  
If you find a support tube that has a dent or is damaged, replace it.

 S 216-016
 (4)  Do these steps to examine the detector elements:
 (a)  Examine the detector element for areas damaged by friction or cuts.
 NOTE: Light scratches on the element are permitted
____
 (b)  If you find damage on the element, replace it.
 S 216-007
 (5)  Do these steps to examine the electrical connectors on the elements:
 (a)  
Make sure that the pins are not damaged, or bent.

 (b)  
Make sure that the sockets are not damaged.

 (c)  
Make sure that the holes for the lockwires are clean.

 (d)  
Make sure that the surface of the receptacle connector is not damaged.

 NOTE: The surface of the receptacle seals the connector.
____ The damage can let foreign material in the connector.
 WARNING:_______DO NOT BREATHE THE SOLVENT FUMES OR MIST. DO NOT LET THE SOLVENT TOUCH YOUR EYES OR YOUR SKIN AND CLOTHING. THE SOLVENTS ARE DANGEROUS AND/OR FLAMMABLE. KEEP THE FLAMMABLE MATERIALS AWAY FROM A SOURCE OF FIRE. MAKE SURE THAT YOU USE APPROVED RESPIRATORY EQUIPMENT WHEN IT IS NECESSARY. MAKE SURE YOU HAVE A GOOD AIR FLOW WHEN YOU USE SOLVENTS. SOLVENT FUMES AND MIST CAN CAUSE INJURIES.
 (e)  Examine the connectors for the signs of corrosion.
 NOTE: The corrosion will show as a thin layer of black
____
 material on the connector.

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