FWD
SEE C
B
FWD FAN COOLING (2 LOCATIONS) AC GENERATOR
C
Figure 1 (Sheet 2) APU Cooling Air System Components
L77528
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49-51-00
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A
747-400 FAULT ISOLATION/MAINT MANUAL
APU COOLING AIR SYSTEM
COMPONENT 102 SHT FIG. QTY ACCESS/AREA AMM REFERENCE
FAN - COOLING SCREEN - COOLING AIR INLET 1 2 1 1 317AL, 318AR/310 (APU COMPARTMENT) 317AL, 318AR/310 (APU COMPARTMENT) 49-51-02 49-51-04
APU Cooling Air System - Component Index
Figure 101
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A
747-400 FAULT ISOLATION/MAINT MANUAL
SEE A
SEE B
FWD
APU COMPARTMENT
COOLING AIR INLET SCREEN
COOLING FAN
FWD
A
APU Cooling Air System - Component Location
Figure 102 (Sheet 1)
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L78078
A
747-400 FAULT ISOLATION/MAINT MANUAL
FWD
SEE C
B
FWD AC GENERATOR
COOLING (2 LOCATIONS)
FAN
C
APU Cooling Air System - Component Location
Figure 102 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
COOLING FAN - REMOVAL/INSTALLATION
__________________________________
1. General_______
A. This procedure has these tasks:
(1)
A removal of the cooling fan
(2)
An installation of the cooling fan.
B.
The cooling fan supplies cooled air for the two APU ac generators, air-cooled oil cooler and the APU compartment. The cooling fan is installed on the load gearbox and above the two APU ac generators.
TASK 49-51-02-004-001
2. Cooling Fan Removal (Fig. 401)___________________
A. References
(1)
AMM 49-11-01/401, Auxiliary Power Unit
(2)
AMM 49-51-04/401, Cooling Air Inlet Screen
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 864-054
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 864-055
(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
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