(2)
AMM 07-11-01/201, Airplane Jacking
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 29-11-00/201, Main Hydraulic Supply System
C.
Access
(1)
Location Zone 311 Area Aft of Pressure Bulkhead, LH 312 Area Aft of Pressure Bulkhead, RH 315 Area Aft of Stabilizer Box Compartment, LH 316 Area Aft of Stabilizer Box Compartment, RH
(2)
Access Panel
315A Access Door
D.
Prepare for Adjustment
S 862-038
(1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
(2)
Do this task: "Supply Hydraulic Power" (AMM 29-11-00/201).
S 862-039
(3)
Use the STAB TRIM ALTN switches to set the horizontal stabilizer to the neutral rig position (3 units of trim).
(4)
Set the STAB TRIM 2 and 3 switches to CUTOUT.
S 862-041
(5)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7E7, L STAB TRIM S/O VLV
2) 7E20, R STAB TRIM S/O VLV
S 862-066
S 862-040
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747-400
MAINTENANCE MANUAL
S 862-042
(6) Do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).
S 862-043
(7) Set all FLT CONTROL HYD POWER TAIL switches on the P461 Pilots'
Overhead Maintenance Panel in SHUTOFF.
S 862-069
(8) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P180, DC Power Distribution Panel
1) 180E7, ELEV/RUD VLV SYS 2
2) 180E22, ELEV/RUD VLV SYS 4
3) 180H8, ELEV/RUD VLV SYS 1
4) 180H23, ELEV/RUD VLV SYS 3
S 012-044
(9) Open the access doors 312A and 315A.
NOTE:____ Position upper lobe access ladder if used.
S 032-046
(10)
If it is necessary, disconnect the hydraulic lines and remove the support brackets.
S 032-047
(11)
Remove the upper and lower stabilizer-to-body seal fairings on the side to which the hinge access is necessary.
S 012-048
(12)
If it is necessary, remove the 334GB or 344GB panel (AMM 06-09-06/201).
S 492-049
(13)
Use the check tool to lift the stabilizer until there is no load applied to the stabilizer hinges.
S 032-050
(14)
Remove the internal lockbolt nut (10), the washer (11), the cotter pin (21), the internal lockbolt (9), and the antirotation plate (12).
S 032-051
(15)
Loosen the inner nut (20).
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747-400 MAINTENANCE MANUAL
E. Adjust the Stabilizer Hinge
S 822-064
(1)
Measure the distance d.
(a)
Measure the distance d between the inboard face of the stabilizer hinge fitting (16) and the hinge support fitting (14) at the same locations on the left and right sides of the airplane.
(b)
Adjust the stabilizer hinges until the distances d on the left and right sides agree in |0.030 inch (|0.76 millimeter).
S 822-067
(2)
Adjust the hinges.
(a)
Make sure the adjustment screw (6) and the outer nut (22) are loosened sufficiently to permit the necessary lateral movement of the stabilizer.
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