(d)  
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the left access door.

 (e)  
Install the two quick-release pins in the two brackets on the left APU compartment bulkhead.

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

 (g)  
Lift the left access door until the two APU access doors are approximately aligned.

 (h)  
Close the two APU access doors.

 (i)  
Close the six latches on the right access door.

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747-400 MAINTENANCE MANUAL
 APU CONTROLLER - REMOVAL/INSTALLATION
_____________________________________
 1.  General
_______
 A.  This procedure has these tasks:
 (1)  
A removal of the APU controller

 (2)  
An installation of the APU controller.

 B.  
The APU controller is installed on the E8 aft equipment center. The E8 aft equipment center is above and aft of the aft cargo compartment. You can get access to the APU controller through an open access area in the aft cargo compartment.

 TASK 49-61-07-004-001
 2.  APU Controller Removal (Fig. 401)
______________________
 A.  References
 (1)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 31-61-00/201, Integrated Display System

 B.  
Access

 (1)  
Location Zones 271 Main Deck - Station 2040 to Station 2360, Left 273 Area Above Ceiling - Station 2040 to Station 2360, Left

 (2)  
Access Panels
 835L No. 5 Main Entry Door - Left

 C.  
Prepare for the Removal

 S 864-002
 (1)  
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.

 S 744-028

 (2)  
Get access to the APU maintenance page. To get access to it, do this task: Obtain Airplane System Information (AMM 31-61-00/201).

 (a)  
Look at the APU maintenance page and write the data that follows:

 NOTE: This data is the maintenance record of the APU and can
____ be used to monitor the APU performance.
 1)  The total number of APU operation hours
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747-400 MAINTENANCE MANUAL
 2) The total number of APU starts (cycles) 3) The APU serial number.
 S 864-003
 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 D.
APU Controller Removal

 S 024-029
 CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ APU CONTROLLER. A FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (1)  Remove the APU controller (1). To remove it, do this task: ESDS Metal Encased Units - Removal Handling (AMM 20-41-02/201).
 TASK 49-61-07-404-007
 3.  APU Controller Installation (Fig. 401)___________________________
 A. References
 (1)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 49-11-00/501, Auxiliary Power Unit

 B. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | APU Controller | 49-61-07 | 01 | 5 | 2.......….......…...................................…...........…......….......1
　
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