APU OIL EXTERNAL DISTRIBUTION SYSTEM
COMPONENT FIG. SHT 102 QTY ACCESS/AREA REFERENCE AMM
COOLER - FUEL-COOLED OIL COOLER - AIR-COOLED OIL 2 1 1 1 COMPARTMENT) 317AL, 318AR/310 (APU COMPARTMENT) 317AL, 318AR/310 (APU 49-91-02 49-91-01
APU Oil External Distribution System - Component Index
Figure 101
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
FAULT ISOLATION/MAINT MANUAL
SEE A
FWD
APU COMPARTMENT
AIR-COOLED OIL COOLER
COOLING AIR
OUTLET DUCT
FWD
A
APU Oil External Distribution System - Component Location
Figure 102 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L76705
A
747-400
FAULT ISOLATION/MAINT MANUAL
FWD
SEE B
APU COMPARTMENT
FWD
SEE C
B
OIL SENSOR
HOUSING
FUEL-COOLED OIL COOLER FWD
C
APU Oil External Distribution System - Component Location
Figure 102 (Sheet 2)
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L76761
A
747-400 MAINTENANCE MANUAL
AIR-COOLED OIL COOLER - REMOVAL/INSTALLATION
____________________________________________
1. General
_______
A. This procedure has these tasks:
(1)
A removal of the air-cooled oil cooler
(2)
An installation of the air-cooled oil cooler.
B.
The air-cooled oil cooler is installed on the top of the load gearbox and behind the cooling air outlet duct.
TASK 49-91-01-004-001
2. Air-Cooled Oil Cooler Removal (Fig. 401)
_____________________________
A. Equipment
(1)
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
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 864-003
(2)
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
S 014-031
(3)
Open the left APU access door, 317AL, and right APU access door, 318AR:
(a)
While you hold the two APU access doors in the closed position, open the six latches on the right access door.
NOTE: The left access door will open fully and the right
____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
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