(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 432-032
 (14)
 Install the R7715 relay (WDM 49-11-14)

 S 862-041

 (15)
 Do this task:  Put the Air/Ground Relay System Back in the Ground Mode (AMM 32-09-02/201).

 S 842-040

 (16)
 Do this task:  Put Safety Systems Back to the Condition Before Air Mode Simulation (AMM 32-09-02/201).

 S 862-033

 (17)
 Remove the DO-NOT-CLOSE tag and close the APU INLET DOOR CIRCUIT breaker on the P83 panel.

 (18)
 Make sure the air inlet door closes.

 S 862-035

 (19)
 Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 panel.

 S 862-034
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 49-15-05
 ALL  ú ú 01 Page 206 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AIR INLET SCREEN - REMOVAL/INSTALLATION
_______________________________________
 1.  General_______
 A. This procedure contains the tasks to remove and install the inlet screen
 (9)
 for the APU.

 B.  
The air inlet screen (9) is attached to the air inlet plenum that attaches to the lower flange of the air inlet duct. You must remove the APU to get access to the air inlet screen (9).

 TASK 49-15-06-004-001
 2.  Air Inlet Screen Removal (Fig. 401)________________________
 A.  Reference
 (1)  
AMM 49-11-01/401, Auxiliary Power Unit

 (2)  
AMM 49-41-03/401, Ignition Exciter

 (3)  
AMM 49-52-03/401, Inlet Guide Vane Actuator

 (4)  
AMM 49-61-05/401, Air Temperature Sensors

 (5)  
AMM 49-61-06/401, Inlet Pressure Sensor

 B.  
Access

 (1)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 C.  
Procedure

 S 014-002
 (1)  Remove the APU (AMM 49-11-01/401).
 S 024-006
 CAUTION: MAKE SURE YOU DO NOT HIT THE INLET PLENUM WITH YOUR HANDS OR
_______ TOOLS. IT CAN CAUSE DAMAGE TO THE COMPOSITE MATERIAL.
 MAKE SURE YOU DO NOT LEAN OR SIT ON THE INLET PLENUM WHEN YOU REMOVE THE INLET SCREEN. IT CAN CAUSE DAMAGE TO THE COMPOSITE MATERIAL.
 MAKE SURE YOU COLLECT ALL REMOVED ITEMS. LOOSE ITEMS CAN CAUSE INTERNAL DAMAGE TO THE APU.
 (2)
Do the steps that follow to remove the left inlet screen (9):

 (a)  
Disconnect the P1 pressure sensor connector to gain access to the inlet screen (AMM 49-61-06/401), if necessary.

 (b)  
Loosen the fastener studs from the left inlet door. 1) Remove the left inlet door.

 (c)  
Remove the P17 electrical connector from the IGV actuator (AMM 49-52-03/401), if necessary.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 49-15-06
 ALL  ú ú 01 Page 401 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE A
RIGHT PLENUM
5. WASHER (10 LOCATIONS)
4. BOLT (12 LOCATIONS)
3. THREADED END ROD
2. NUT 5. WASHER
(3 LOCATIONS) (10 LOCATIONS)
1. BOLT (3 LOCATIONS)
4. BOLT PLENUM LEFT (12 LOCATIONS)
RIGHT INLET
DOOR (LOWER)
10. WASHER (CUT ON ONE SIDE) (2 LOCATIONS)
4. BOLT (12 LOCATIONS)
7. WASHER
(10 LOCATIONS) 
6. NUT 
8. BOLT (10  8. BOLT  (10 LOCATIONS) 

(10 LOCATIONS)
LOCATIONS)
7. WASHER (10 LOCATIONS)
LEFT 9. SCREEN INLET DOOR
8. BOLT  FWD (10 LOCATIONS)
7. WASHER (10 LOCATIONS)
A
Air Inlet Screen Installation Figure 401
　
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