(c)  
Put a 1/4-inch square ratchet into the access hole and engage the socket on the actuator.

 CAUTION: DO NOT GO ABOVE 25 POUND-INCHES (2.8 N.M) OF TORQUE WHEN
_______ YOU TURN THE ACTUATOR SOCKET. THE TORQUE THAT IS NECESSARY TO TURN THE CRANK WILL INCREASE AS THE ACTUATOR ROD BECOMES FULLY EXTENDED. DAMAGE CAN OCCUR IF YOU APPLY TOO MUCH TORQUE ON THE CRANK.
 (d)  
Use 25 pound-inches (2.8 N.m) or less of torque to turn the socket counterclockwise until the door is closed. 1) If the door does not close, do this task: APU Air Inlet

 Door Deactivation (Fixed Link Installation).

 (e)  
Remove the ratchet from the actuator socket.

 (f)  
Turn the transfer socket for the electrical or manual operation to the ELECTRICAL position.

 (g)  
Install the access cover for the manual override on the actuator container.

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747-400 MAINTENANCE MANUAL
 S 412-011
 (5)  
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.

 (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 492-012
 (6)  
Replace the DO-NOT-CLOSE tags with collars on these circuit breakers:

 (a)  
P83 Panel, E8 Aft Equipment Center
 1) AIR INLET DOOR
 2) APU PRIMARY CONT
 3) APU START

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

 S 492-013
 (7)  Replace the DO-NOT-OPERATE tag on the APU control switch with an APU INOPERATIVE tag.
 TASK 49-15-00-412-031
 3.  APU Air Inlet Door Deactivation In Closed Position (Fixed Link Installation)____________________________________________________________________________ (Fig. 201)
 A.  Special Tools and Equipment
 (1)  G57NB-5 Collar - Circuit Breaker, Nylon Molding Corp., 1617 S. California, Monrovia, CA. 91016 (four are necessary)
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.
E.
A
747-400 MAINTENANCE MANUAL
 (2)
MIT65B98813 - Link, Air Inlet Door Actuator ReplacementConsumable Materials

 (1)
G00039 Cord-Nylon, MIL-C-5040 (minimum of 3 feet)References

 (1)  
49-15-04/401, Air Inlet Door Actuator

 (2)
IPC 49-15-04 Fig. 1Access

 (1)  Location Zone 318 APU Compartment-Upper Forward Side of Air Inlet Duct, RH
 (2)  Access Panel 317AL APU Access Door 318AR APU Access Door

Procedure
 S 862-032
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 862-033

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

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

 (b)  
P83 Panel, E8 Aft Equipment Center 1) AIR INLET DOOR 2) APU PRIMARY CONT 3) APU START

 S 012-040
 (3)  
Remove the actuator (Ref 49-15-04/401).

 S 492-014

 (4)  
Install the fixed link assembly:

 (a)  
Remove the bolt that attaches the clevis to the bottom of the actuator.

 (b)  
Attach the clevis to the end of the link identified ACTUATOR CONTROL END with a bolt, a bushing, the washers, and a nut.
　
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