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A
747-400
MAINTENANCE MANUAL
KEEL BEAM
SEE A
WING REAR SPAR BULKHEAD FITTING (REF)
WING REAR
SPAR (REF)
A
A
STA 990SPLICE FITTING DRAG STRUT ATTACH FITTING
STA
KEEL BEAM
CENTER WEB
AIRPLANE
KEEL BEAM BOX
STA 1480
UPPER
1232 TIE
LOWER WEB
KEEL BEAM A
MAIN VERTICAL STIFFENER
Keel Beam
Figure 601
CORNER BRACE
FITTING
UPPER CHORD
LOWER CORNER FITTING
LOWER LOWER WEB
CHORD
A-A
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747-400 MAINTENANCE MANUAL
C. Procedure
S 416-007
(1)
Install the door locks for the main landing gear (Ref 32-00-30/201).
S 216-003
(2)
Examine the external surfaces of the webs and the lower chords for the conditions that follow:
Distortion
The removal of paint
Cracks
Fasteners that are not there.
NOTE: The vertical web of the keel beam, aft of the station line,
____ 1232 can contain wrinkles. These wrinkles do not decrease the structural quality of the keel beam.
S 216-004
(3)
Examine the splice fittings at each end of the keel beam for cracks and fasteners that are not there.
S 216-009
(4)
Examine the bulkhead fittings for cracks and fasteners that are not there.
S 216-008
(5)
If you find these conditions on the external surface of the keel beam, examine the internal structure in the same area.
(6)
Examine the keel beam for corrosion.
(7)
Examine the drain holes with a 0.31-inch diameter for blockage.
S 216-005
S 216-006
NOTE: These drain holes are in the underwing keel beam.
____
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747-400 MAINTENANCE MANUAL
FLAP-TO-BODY RUB STRIP - CLEANING/PAINTING
__________________________________________
1. General (Fig. 701)
_______
A. This procedure contains one task. The task is to paint the flap-to-body rub strip.
B. The flap-to-body rub strips attach to the wing-to-body fairing in the area of the trailing edge (TE) flaps. The rub strips prevent damage to the body skin by the inboard TE flap.
C. Paint the rub strips before you install them.
TASK 53-12-02-307-001
2. Paint the Flap-to-Body Rub Strip
________________________________
A. Consumable Materials
(1)
C00064 Alodine 1000
(2)
C00259 Enamel - Primer, Green, BMS 10-11
B. References
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
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