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A
747-400
MAINTENANCE MANUAL
SEE A
HYDRAULIC FITTING (4 PLACES) (ABOVE BRACKET, 4 PLACES) HYDRAULIC FITTING
SEE B SWIVEL BRACKET
LOWER SHEAR PANEL STATION 2598
HYDRAULIC (4 PLACES) FITTING A FWD
LOWER SHEAR PANEL STATION 2598
FWD
B
Internal Lightning Strike Areas Figure 202 (Sheet 1)
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747-400
MAINTENANCE MANUAL
HYDRAULIC
FITTING
SEE C (4 PLACES)
HYDRAULIC FITTING
(ABOVE BRACKET,
4 PLACES)
SWIVEL BRACKET
SEE D
STATION 2598
FWD
C
HYDRAULIC
FITTING
(4 PLACES)
FWD
LOWER SHEAR PANEL STATION 2598
D
Internal Lightning Strike AreasFigure 202 (Sheet 2)
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747-400 MAINTENANCE MANUAL
S 032-047
(3) If leaks are found do the following:
(a)
Remove the pressure from hydraulic systems No. 1, 2, 3, and 4 (Ref 29-11-00/201).
(b)
Remove the hydraulic fittings which were written down as leaking.
NOTE: Use an appropriate container to collect the
____
hydraulic fluid.
1) Disassemble the hydraulic fittings which were written down as leaking. 2) Examine the hydraulic fitting part(s) for surfaces which
are pitted. 3) If the part(s) are pitted, replace the part(s). 4) Reassemble the hydraulic fittings. 5) Tighten the hydraulic fittings.
(c)
Pressurize hydraulic systems No. 1, 2, 3, and 4 (AMM 29-11-00/201).
(d)
Do a check of the replaced hydraulic fittings and look for leakage.
E. Examine the bonding jumpers.
S 212-049
(1) Examine the bonding jumper between stabilizer rear spar and station 2598 partial bulkhead, outboard of stabilizer right and left hinge bearings.
(a)
Face the aft side of station 2598.
(b)
Put hand into the hole in the skin by the elevator power package pushrod.
(c)
Examine the two bonding jumper terminals for discoloration due to an overheat condition.
(d)
Examine the two bonding jumpers for melted or broken strands.
(e)
Make sure the two bonding jumper attach bolts are tight.
S 212-062
(2) Examine the bonding jumpers between horizontal stabilizer center box and the fuselage hinge fitting at Station 2598 (2 left and 2 right).
(a) Examine all of the bonding jumper terminals for signs of discoloration due to an overheat condition.
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747-400 MAINTENANCE MANUAL
(b)
Examine all of the bonding jumpers for melted or broken strands.
(c)
Make sure all of the bonding jumper attach bolts are tight.
S 962-063
(3) Replace any damaged bonding jumpers (AMM 20-11-15/401).
F. Examine the Passenger Entertainment System
S 212-068
(1) If time permits, make a check of the area video, in-seat video, and cabin entertainment system operation (AMM 23-32-00/501).
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