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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SUPPORT BRACKET
A
A
GROMMET
STUD
GROMMET (2 PLACES)
B
A
747-400
MAINTENANCE MANUAL

UPPER FIRE DETECTOR ELEMENT M217
SEE A
BSEE QUICK-RELEASE CLAMP  ASEE LOWER FIRE DETECTOR ELEMENT M216 
TUBE SUPPORT 
END BRACKET 
RETAINING NUT 
STUD  DETECTOR ELEMENT  CONNECTORS ELECTRICAL 
M216 AND M217 APU FIRE DETECTOR LOCKWIRE  AIRPLANE WIRINGS 
A 
ELEMENT DETECTOR GROMMET  CONNECTOR ELECTRICAL  LOCKWIRE 
QUICK-RELEASE CLAMP  A-A 
Figure 601 APU Fire Detector Check 

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A
747-400 MAINTENANCE MANUAL
 (f)  
If you find a thin layer of black material on the connector, use acetone or methyl alcohol to clean the connector.

 (g)  
If you find heavy corrosion (green color), replace the connector.

 S 446-014
 (6)  Remove the DO-NOT-CLOSE tag and close these circuit breakers:
 (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 416-015
 (7)  Close the APU access doors:
 (a)  
Do a visual check of the APU bus bars:
 1) Make sure the bus bars are not damaged.
 2) Make sure no metal parts touch the bus bars.
 3) Make sure the bus bars do not touch each other.

 (b)  
Disengage the support rods for the APU access doors.

 (c)  
Put the support rods in the clips on the inner side of the APU access doors.

 (d)  
Make sure the insulation covers correctly attach to the APU compartment firewall.

 (e)  
Close the APU access doors.

 (f)  
Close the latches on the APU access doors.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 APU FIRE SHUTDOWN MODULE - REMOVAL/INSTALLATION
_______________________________________________
 1.  General_______
 A.  This procedure contains two tasks:
 (1)  
The APU fire shutdown module (M869) removal.

 (2)  
The APU fire shutdown module (M869) installation.

 B.  The APU fire shutdown module is installed in the main wheel well on the right side. The APU shutdown module tells the ground crew about an APU fire. The module has a switch to release the APU fire bottle.
 TASK 26-15-04-004-001
 2.  The APU Fire Shutdown Module Removal (Fig. 401)____________________________________
 A.  References
 (1)  
26-15-00/501, APU Fire Detection System

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

 (3)  
49-11-00/201, Auxiliary Power Unit

 (4)  
IPC 26-15-20 Fig.1

 B.  Access
 (1)  
Location Zone
 138 Body Landing Gear Well R.H.

 (2)  
Access Panel
 761 Body Landing Gear - Aft Inboard Right
 763 Body Landing Gear - Fwd Inboard Right

 C.  Procedure
 S 044-002
 (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 494-016
 WARNING:  YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURIES AND DAMAGE TO EQUIPMENT.
　
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