(2)
Access Panel
312AR Service Access Door
D. Prepare to Remove the Pivot Pin
S 864-073
WARNING: APPLY ELECTRICAL POWER TO OPEN THE STABILIZER TRIM SHUTOFF AND
_______ PREVENT HYDRAULIC OPERATION OF THE HORIZONTAL STABILIZER. IF ELECTRICAL POWER IS NOT AVAILABLE, ATTACH A PLACARD TO THE MANUAL CONTROL LEVERS FOR THE HORIZONTAL STABILIZER. ACCIDENTAL OPERATION OF THE HORIZONTAL STABILIZER CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Put the leading edge of the horizontal stabilizer up (nose-up) before you open the circuit breakers.
NOTE: This position will give you the best access when you remove
____
and install the pivot pin.
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A
747-400
MAINTENANCE MANUAL
HORIZONTAL STABILIZER
PIVOT FITTING
SEE A
313AL
LOWER SEAL
FAIRING
312AR HORIZONTAL
STABILIZER
OUTBOARD HINGE
A
INBOARD HINGE
SEE B
SEE C
A
HORIZONTAL
STABILIZER
FWD INBD
HORIZONTAL STABILIZER
PIVOT FITTING
A
Horizontal Stabilizer Pivot Pin
Figure 401 (Sheet 1)
E30554
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A
747-400 MAINTENANCE MANUAL
5. PIVOT 6. PIVOT FITTING
FITTING BEARING RETAINERHINGE
Horizontal Stabilizer Pivot Pin
Figure 401 (Sheet 2)
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E29033
A
747-400
MAINTENANCE MANUAL
HORIZONTAL STABILIZER PIVOT FITTING
B B
HORIZONTAL STABILIZER
85.00 "G" 85.06 84.94 INCHES
B-B
Horizontal Stabilizer Pivot Pin
Figure 401 (Sheet 3)
G87051
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747-400 MAINTENANCE MANUAL
(2) S 864-004Put the STAB TRIM NO. 2 and NO. 3 HYD switches on the control stand in the CUTOUT position.
(3) S 864-005Open these circuit breakers on the overhead circuit breaker panel, P7, and attach DO-NOT-CLOSE tags: (a) 7E7, STAB TRIM L S/O VALVE. (b) 7E20, STAB TRIM R S/O VALVE.
S 014-074
WARNING: BEFORE YOU BEGIN TO WORK, MAKE SURE THAT THERE IS NO MOVEMENT
_______ OF THE HORIZONTAL STABILIZER.
(4) Open the Service Access Door, 312AR (AMM 06-09-05/201).
S 944-008
WARNING: MAKE SURE THE SERVICE PLATFORM IS INSTALLED ABOVE THE SERVICE
_______ ACCESS DOOR OPENING. IF YOU DO NOT INSTALL THE SERVICE PLATFORM, YOU CAN FALL THROUGH THE SERVICE ACCESS DOOR OPENING AND INJURY CAN OCCUR.
(5)
Install the service platform above the opening of the service access door.
S 494-010
(6)
Install the horizontal stabilizer jacking equipment.
S 494-011
(7)
Attach the dial indicator bracket to the flange of an intercostal bracket above and behind the torque box.
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