S 012-004
 (3)  
Open the APU access doors:

 (a)  
Open the latches on the APU access doors.

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A
747-400
MAINTENANCE MANUAL

SEE A
AIR INLET DOOR (OPEN)
SEEB
SEE C
ACTUATOR
CONTAINER

AIR INLET DUCT
A AIR INLET DOOR
RECEPTACLE FOR THE DOOR POSITION SWITCH
SWITCH STRIKE PLATE
MOUNTING KEYWASHER ADAPTER
NUT
AIR INLET DUCT
DOOR POSITION
SWITCH

B
APU FIREWALL
FWD
C
APU Door Position Switch Installation
Figure 201

F58293
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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 022-005
 (4)  
Remove the door position switch:

 (a)  
Disconnect the switch connector D7427P from the firewall receptacle.

 (b)  
Remove the lockwire from the door position switch.

 (c)  
Loosen the nut that attaches the door position switch to the mounting adapter.

 (d)  
Remove the door position switch from the mounting adapter. 1) Keep the key washer and the nut with the switch.

 TASK 49-15-05-402-008
 3.  Door Position Switch Installation (Fig. 201)_________________________________
 A. References
 (1)  
IPC 49-15-51 Fig. 1

 B.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | | Switch (Air Inlet Door Position | 49-15-51 | 01 | 135 | | | | Switch) | or | | | | | | | 49-15-51 | 01A | 41 | 2.......….......…...................................…...........…......….......1

 C.
Access

 (1)  
Location Zone

 318AR  APU Compartment-Forward Side of Air Inlet Plenum Above Actuator Container, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 D.
Procedure

 S 422-036
 (1)  
Install the door position switch:

 (a)  
Move the nut and the washer to the end of the switch with the nameplate on it.

 (b)  
Install the door position switch in the mounting adapter. 1) Do not connect the switch or tighten the nut at this time.

 (c)  
Adjust the door position switch (Ref par. 4).

 S 862-012
 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

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747-400 MAINTENANCE MANUAL
 S 862-013
 (3)  
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 panel.

 S 412-014

 (4)  
Close the APU access doors:

 (a)  
Do a visual check of the EGT 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.
　
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