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A
747-400 MAINTENANCE MANUAL
 CAUTION: FAILURE TO SET TRANSFER SCREW TO MANUAL (180 DEGREES
_______ COUNTERCLOCKWISE) PRIOR TO CRANKING WILL RESULT IN ACTUATOR DAMAGE. DO NOT EXCEED 25 LB-IN (2.825 N-m) OF TORQUE AT DRIVE SOCKET. A SHARP TORQUE RISE WILL OCCUR AT END OF ACTUATOR TRAVEL. APPROACH CAUTIOUSLY.
 (4)  The door may be opened or closed by handcrank if a component failure prevents electrical operation. Prior to using handcrank, the electrical/manual transfer screw must be set to the manual position (180-degree turn counterclockwise). The drive socket must be rotated counterclockwise to close door and clockwise to open door. When returning to electrical mode, clockwise pressure must be applied to the transfer screw while the manual crank is used to rotate the gears into position. When in position, the transfer screw will complete the 180-degree clockwise rotation to the electrical mode position. For more details on the APU air inlet system, refer to these wiring diagrams and functional schematic: WDM 49-11-11: APU Start Control Circuit WDM 49-15-11: APU Inlet Door Control and Indication SSM 49-15-01: APU Inlet Door Control and Indication.
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747-400 FAULT ISOLATION/MAINT MANUAL
APU AIR INLET
COMPONENT  FIG. SHT 102  QTY  ACCESS/AREA  REFERENCE AMM 
SCREEN - AIR INLET SWITCH - AIR INLET DOOR POSITION, S1598 SEAL - AIR INLET DUCT DOOR - AIR INLET ACTUATOR - AIR INLET DOOR, M83 
 1 1 2 1 1  COMPARTMENT) 317AL, 318AR/310 (APU COMPARTMENT) 317AL, 318AR/310 (APU COMPARTMENT) 317AL, 318AR/310 (APU COMPARTMENT) 317AL, 318AR/310 (APU COMPARTMENT) 317AL, 318AR/310 (APU  49-15-05 49-15-02 49-15-06 49-15-03 49-15-04 

APU Air Inlet - Component Index
Figure 101

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747-400
FAULT ISOLATION/MAINT MANUAL

SEE A
SEE  C 
DUCT AIR INLET 
SEE  B 
FWD 
APU COMPARTMENT  FWD  SEAL FOR THE AIR INLET DUCT 
DOOR, S1598 POSITION SWITCH FOR THE AIR INLET  AIR INLET DOOR (OPEN POSITION)  A 

AIR INLET DUCT 
AIR INLET DOOR ACTUATOR, M83  (2 LOCATIONS) AIR INLET SCREEN 
FWD 
B 

FWD
C
APU Air Inlet - Component Location Figure 102
F58286
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747-400 MAINTENANCE MANUAL
 APU AIR INLET - MAINTENANCE PRACTICES
_____________________________________
 1.  General_______
 A.  This procedure contains the tasks to do the deactivation and the activation of the air inlet door for the APU. Use these tasks if the air inlet door does not operate correctly. This procedure gives the steps to do these tasks:
 (1)  
APU Air Inlet Door Deactivation In Closed Position (Manual Actuator Operation)

 (2)  
APU Air Inlet Door Deactivation (Fixed Link Installation)

 (3)  
APU Air Inlet Door Activation (Fixed Link Removal)

 (4)  
APU Air Inlet Door Activation (Manual Actuator Operation)

 B.  
If the air inlet door is open during the flight, close the door as soon as it is possible. A closed air inlet door will not permit the APU to turn freely during the flight.
　
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