NOTE: The lanyard will hold the right access door on the APU
____
 compartment bulkhead.

 (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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 49-91-01
 ALL  ú ú 05 Page 406 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AIR-COOLED OIL COOLER - CLEANING
________________________________
 1.  General_______
 A.  This procedure contains the task to clean the air-cooled oil cooler.
 B.  It is necessary to remove the air-cooled oil cooler from the APU to clean the air-cooled oil cooler.
 TASK 49-91-01-117-001
 2.  Air-Cooled Oil Cooler - Cleaning________________________________
 A.  References
 (1)  
AMM 49-91-01/401, Air-Cooled Oil Cooler

 B.  
Standard Tools and Equipment

 (1)  
Spray Wash Machine

 C.  
Consumable Materials

 (1)  
B00820 Blue Gold Spray Wash (Low Foam) 5-10% by volume.

 (2)  
B00820 Adrox 6333 (Low Foam) 2-10% by volume.

 D.  
Procedure

 S 027-002
 (1)  
If it is necessary, do the procedure to remove the air-cooled oil cooler from the APU (AMM 49-91-01/401).

 S 037-003

 (2)  
Put protection caps on the two oil ports.

 S 167-008
 WARNING:_______USE SAFETY GOGGLES WHEN YOU USE THE COMPRESSED AIR. IF YOU DO NOT USE SAFETY GOGGLES, AN EYE INJURY CAN OCCUR.
 (3)  
Use compressed air at 80 to 100 psig to remove loose contamination from the air ducts of the air-cooled oil cooler.

 S 117-005

 (4)  
Use a spray wash machine with solvent and spray wash the air-cooled oil cooler in a 5 to 30 minute wash cycle.

 S 177-006

 (5)  
Flush the air-cooled oil cooler fully with hot water at 90° to 200° F (32° to 93° C).

 S 167-007

 (6)  
Use dry, compressed air at 80 to 100 psig to dry the air ducts of the air-cooled oil cooler.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 49-91-01
 ALL  ú ú 01 Page 701 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FUEL-COOLED OIL COOLER - REMOVAL/INSTALLATION
_____________________________________________
 1.  General
_______
 A.  This procedure has these tasks:
 (1)  
A removal of the fuel-cooled oil cooler

 (2)  
An installation of the fuel-cooled oil cooler.

 B.  
The fuel-cooled oil cooler is installed on the bottom right side of the accessory gearbox and adjacent to the oil sensor housing.

 TASK 49-91-02-004-001
 2.  Fuel-Cooled Oil Cooler Removal (Fig. 401)
______________________________
 A.  Equipment
 (1)  
Container - Fuel Resistant, 5 U.S. Gallons (19 Liters)

 (2)  
Container - Oil Resistant, 1 U.S. Gallon (4 Liters)

 B.  
Access

 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 C.  
Prepare for the Removal

　
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