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

 C.  Procedure
 S 864-002
 (1)  Open the circuit breakers listed below and attach DO-NOT-CLOSE identifiers:
 (a)  P6 Main Power Distribution Panel 1) 6C5 ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT
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6. NUT
SUPPORT BRACKET
16. QUICK-RELEASE CLAMP
15. GROMMET
14. SUPPORT TUBE
13. DETECTOR ELEMENT
A
747-400
MAINTENANCE MANUAL

UPPER FIRE DETECTOR 
ELEMENT M217 
SEE  A 
1. SCREW 
2. END BRACKET 
3. NUT 
4. SCREW 
5. SCREW 

7. RETAINING NUTS
8. END BRACKET
6. NUT
6. NUT 11. WASHER
12. WASHER
4. SCREW
APU UPPER FIRE DETECTOR ELEMENT M217 A
APU Fire Detector Installation
Figure 401 (Sheet 1)

LOWER FIRE DETECTOR ELEMENT M216
SEE B
AIRPLANE WIRING
9.
 ELECTRICAL CONNECTOR

10.
 SCREW

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A

747-400
MAINTENANCE MANUAL

17. NUT 
21. P-CLAMP 20. SCREW 20. SCREW  ELEMENT 17. NUT 18. DETECTOR 
SUPPORT BRACKET 

7. RETAINING
NUTS

19. LOCKWIRE
END BRACKET
APU LOWER FIRE DETECTOR ELEMENT M216
B
APU Fire Detector Installation
Figure 401 (Sheet 2)

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A
747-400 MAINTENANCE MANUAL
 2) 6C6 FIRE SW UNLOCK 3) 6H14 APU FIRE/BLD DUCT OVHT LOOP A 4) 6H15 APU FIRE/BLD DUCT OVHT LOOP B
 S 014-003
 (2)  
Open the latches on the APU access doors.

 S 014-181

 (3)  
Open the APU access doors.

 S 434-182

 (4)  
Engage the suport rods for the APU access doors.

 S 034-004

 (5)  
Disconnect the electrical connectors DM216 or DM217 (8) at both ends of detector element.

 S 034-113

 (6)
Put the protective caps on both ends of the detector element.

 S 024-183

 (7)
Remove the lockwires (19) at both ends of detector element.

 S 034-005
 CAUTION:_______DO NOT TWIST OR SHARPLY BEND THE DETECTOR ELEMENT. THIS MAY DAMAGE THE DETECTOR ELEMENT.
 (8)  
Remove the retaining nut (7) which holds the detector electrical connector (8) to support tube end bracket (2), at both ends of detector.

 S 034-006

 (9)  
Remove the copper gasket (9) from end brackets (2), and discard the copper gasket (9).

 NOTE: A new copper gasket should be installed anytime the detector
____
 assembly is removed.

 S 034-007
 (10)
 Open the quick-release clamps (16).

 (11)
 Remove the detector element (13) or (18).

 S 024-008
 TASK 26-15-02-404-020
 3. Install APU Fire Detector Element (Fig. 401)
_________________________________
 A. Standard Tools and Equipment
 (1)  Ohmmeter - Accuracy |0.001 ohm, Minimum 0.001 ohm
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