(2)
Access Panel
573CB Hydraulic Access Panel-System 1
664AB Main Tank Access Door-System 1
544AB Main Tank Access Door-System 2
644AB Main Tank Access Door-System 3
673AB Hydraulic Access Panel-System 4
646AB Main Tank Access Door-System 4
C.
Procedure
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-002
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REAR SPAR
TUBE CLAMP (3 LOCATIONS)
MOUNTING BOLT WASHER (QTY 2) NUT SHIM (6 LOCATIONS)
SKIN STRINGERS ON THE LOWER WING
FWD SEE A
HEAT EXCHANGER INLET AND OUTLET FITTINGS
SEE B
BOND
JUMPER
OUTBD
A
747-400 MAINTENANCE MANUAL
SEE A
ADAPTER FITTING
A
FILLET SEALANT
REAR
SPAR PACKING
A
B
HEAT
EXCHANGER
PACKING
FILLET SEALANT
REAR
SPAR
A-A
A
Heat Exchanger Installation Figure 401
BULKHEAD
NUT
WASHER
HEAT
EXCHANGER
FITTING
ADAPTER FITTING
HEAT EXCHANGER FITTING
BACKUP RING
PACKING
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A 747-400 MAINTENANCE MANUAL
(2) S 864-003Release the pressure in the pneumatic system (AMM 36-00-00/201).
(3) S 864-004Release the pressure in the hydraulic system (AMM 29-11-00/201).
(4) S 684-005Drain the fuel from the applicable main fuel tank (AMM 28-26-00/201).
(5) S 014-035Remove the access door for the applicable fuel tank (AMM 28-11-02/401).
(6) S 844-006Prepare the fuel tank for entry (AMM 28-11-00/201).
(7) S 014-036Get access to the tube connections for the heat exchanger: (a) On system No. 1, open the hydraulic access panel 573CB (AMM 06-09-08/201). (b) On system No. 2, the tube connections are in the wheel well for the left wing landing gear. (c) On system No. 3, the tube connections are in the wheel well for the right wing landing gear. (d) On system No. 4, open the hydraulic access panel 673CB (AMM 06-09-08/201).
(8) S 024-033Remove the heat exchanger: (a) Disconnect the hydraulic tubes for the heat exchanger at the rear spar. 1) Install caps on all the open tubes to prevent contamination. (b) Remove the adapter fittings and the bulkhead nuts from the heat exchanger inlet and outlet fittings. (c) Remove the six mounting bolts, the washers, the shims, and the nuts from the heat exchanger. (d) Remove the bond jumper.
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A
747-400 MAINTENANCE MANUAL
(e) Remove the heat exchanger from the fuel tank.
NOTE: The packings in the grooves of the inlet and the
____ outlet fittings can cause the fittings to attach to the rear spar.
(f) Install caps on the heat exchanger fittings to prevent contamination.
TASK 29-11-22-404-014
3. Heat Exchanger Installation (Fig. 401)
___________________________
A. Consumable Materials
(1)
A00379 Sealant-Integral Fuel Tank, BMS5-26
(2)
C00307 Corrosion-Resistant Finish, BMS10-20-T2
(3)
C00862 Finish, Alodine 600
(4)
D00153 Fluid-Hydraulic, Fire-Resistant, BMS 3-11
B.
References
(1)
AMM 06-09-08/201, Wing Access Doors and Panels
(2)
AMM 12-11-01/301, Fuel Tank
(3)
AMM 12-12-01/301, Hydraulic Systems
