(6)
AIPC 21-51-03 Fig. 2
(7)
AIPC 21-51-03 Fig. 3
(8)
AIPC 21-51-03 Fig. 4
(9)
AIPC 21-62-56 Fig. 1
(10)
AIPC 21-62-56 Fig. 2
C. Access
(1)
Location Zone
133 Air Conditioning Equipment Bay, LH
134 Air Conditioning Equipment Bay, RH
(2)
Access Panel
191E-L Air Conditioning Access Panel
191M-L Air Conditioning Access Panel
192E-R Air Conditioning Access Panel
D. Prepare for the Removal
S 864-005
(1) Release the pressure from the pneumatic system (AMM 36-00-00/201).
(a) Make sure the DUCT PSI L and R, on the EICAS ECS synoptic page, are less than 0.50 (AMM 45-10-00/201).
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A
747-400
MAINTENANCE MANUAL
SEE C
SEE A 1. BOLT (20) 2. ACCESS DOOR RAM AIR DUCT
DUCT RAM AIR 5. 4. 3. (4 PLACES) RETAINER SLEEVE SEAL
SEE B PACK 2 HEAT EXCHANGER (REF)
A
7. 8. (26 PLACES) WASHER BOLT AND 6. ELECTRICAL CONNECTOR
ACTUATOR EXIT DOOR RAM AIR
B
Figure 401 (Sheet 1) Heat Exchanger Installation
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A
28.
BOLT
29.
NUT
30.
WASHER (2 PLACES)
26.
BOLT
27.
WASHER (12 PLACES)
25.
747-400 MAINTENANCE MANUAL
13. BOLT
11. BOLT
14. WASHER
12. WASHER (2 PLACES)
(16 PLACES)
9.
BOLT
10.
WASHER
15. FILLER
(8 PLACES)
16.
BOLT (4)
17.
NUT (4)
18.
WASHER (4) (2 PLACES)
FILLER
19. JUMPER
19.
ASSY
24. GASKET
20. EXIT DOOR
23. GASKET ASSY
21. HEAT
22. WATER EXCHANGER
ASPIRATOR SEE C
FITTING
C
31. SCREW
32. CLIP
RAM AIR
EXIT DOOR LIMIT SWITCH
D
Heat Exchanger Installation
Figure 401 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
S 864-041
(2) Turn the applicable PACK selector, on the overhead panel, P5, to the OFF position.
(a) Put a DO-NOT-OPERATE tag on the selector.
S 864-006
(3) Open the applicable circuit breaker, on the DC power distribution panel, P180.
(a)
180J2, PACK 1 PROT
(b)
180F2, PACK 2 PROT
(c)
180J17, PACK 3 PROT
S 014-007
(4) Open the applicable access panel (AMM 06-09-03/201):
(a)
191E-L for pack 1.
(b)
191M-L for pack 2.
(c)
192E-R for pack 3.
S 014-040
(5)
Remove the bolts (20) from the access door (2) in the ram-air duct.
S 014-045
(6)
Remove the access door (2) from the ram-air duct.
E. Remove the Heat Exchanger
S 034-008
(1)
Disconnect the electrical connector (6) from the actuator for the ram-air exit door.
(2)
Remove the bonding jumper (19) from the support bracket.
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