C. References
 (1)  
24-22-00/201, Manual Control

 (2)  
26-15-00/501, APU Fire Detection

 (3)  
WDM 26-15-11

 (4)  
SSM 26-15-01

 D.
Access

 (1)  
Location Zone
 317 APU Compartment, LH
 318 APU Compartment, RH

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

 E.
Procedure

 S 424-081
 CAUTION:_______DO NOT TWIST OR SHARPLY BEND THE DETECTOR ELEMENT. THIS MAY DAMAGE THE DETECTOR ELEMENT.
 (1)  
Position the detector element (13) or (18), new copper gasket (9) and the support tube (14) on the end brackets (2).

 S 434-082

 (2)  
For the top side of the upper detector element, install the
 screw (1) and nut (3) on the end bracket (2).

 S 434-083

 (3)  
For the bottom side of the upper detector element, install the screw (10), washer (11), and nut (6) on the end bracket (2).

 S 434-084

 (4)  
For the lower detector element, install the screw (20), and nut (17) on the end brackets (2).

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747-400 MAINTENANCE MANUAL
 (5)  S 434-085For the vertical part of the upper detector element, install the screws (4) and nuts (6) for each support bracket.
 (6)  S 434-086For the horizontal part of the upper detector element, install the P-clamps (21), screws (4), washers (12), and nuts (6) for each support bracket.
 (7)  S 424-185For the vertical part of the lower detector element, install the P-clamps (21), screws (20), and nuts (17) on the support bracket.
 (8)  S 764-087Make sure the resistance between the electrical connector DM216 or DM217 (8) shell and the primary structure of airplane is not greater than 0.010 ohm.
 (9)  S 434-088Put the lockwire on the retaining nuts (7).
 S 434-089

 (10)
 Remove the protective caps from airplane wiring connectors and connnect with the electrical connectors DM216 or DM217 (8).

 S 434-090

 (11)
 Torque the connectors to 50 to 70 pound-inches.

 S 434-091

 (12)
 Put the lockwire on the airplane wiring connectors and the electrical connectors (8).

 S 414-109

 (13)
 Close the APU access doors:

 (a)  Do a visual check of the APU bus bars: 1) Make sure the bus bars are not damaged.
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 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.

 S 864-110
 (14)
 Close the circuit breakers listed below, and remove DO-NOT-CLOSE identifiers:

 (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

 (15)
 Do the APU fire detection operational test (Ref 26-15-00/501).

 S 734-111
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