27-41-00
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A
747-400
MAINTENANCE MANUAL
BALLSCREW
STOP
BALLNUT
STOP
SEE A
STABILIZER
TRIM
JACKSCREW
HYDRAULIC
BRAKES
HYDRAULIC
MOTORS STABILIZER TRIM
HYDRAULIC JACKSCREW GEARBOX
BRAKE
A SEE B
JACKSCREW
GEARBOX
DUST
COVER
ADAPTER MOTOR HYDRAULIC WRENCH
B
Stabilizer Trim Drive Mechanism Figure 201
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27-41-00
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747-400 MAINTENANCE MANUAL
S 022-006
(5)
Do this task to remove one hydraulic brake: "Stabilizer Trim Hydraulic Brake Removal" (AMM 27-41-05/401).
S 492-007
(6)
Install the air motor tool, the dust cover and the adapter.
S 862-008
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ HORIZONTAL STABILIZER CONTROL SURFACES BEFORE YOU MOVE THE STABILIZER. A MOVEMENT OF THE STABILIZER CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
CAUTION: USE THE AIR MOTOR TOOL WITH THE FREE SPEED LESS THAN 1200 RPM.
_______ IF THE SPEED IS TOO HIGH, THE AIR MOTOR TOOL CAN CAUSE DAMAGE TO THE AIRPLANE COMPONENTS.
(7)
Use the power wrench of the air motor tool to move the stabilizer jackscrew through the adapter.
S 862-009
(8)
Move the stabilizer to the necessary position.
S 092-010
(9)
Remove the air motor tool, the dust cover and the adapter.
S 422-011
(10)
Do this task: "Stabilizer Trim Hydraulic Motor Installation" (AMM 27-41-10/401).
S 422-012
(11)
Do this task: "Stabilizer Trim Hydraulic Brake Installation" (AMM 27-41-05/401).
TASK 27-41-00-822-026
3. Horizontal Stabilizer Neutral Rig Position (Fig. 202)
__________________________________________
A. General
(1) This task is used to set the horizontal stabilizer to the neutral rig position. It can also be used to set the stabilizer to other positions.
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747-400
MAINTENANCE MANUAL
STABILIZER
SEE A TRIM LIMIT SWITCHES
STABILIZER
JACKSCREW
STABILIZER TRIM
CONTROL MODULE
BALLSCREW
STOP
MANUAL ELECTRICAL
STABILIZER TRIM
SWITCHES
B"
BALLNUT
STOP
UPPER GIMBAL
A
Horizontal Stabilizer Neutral Setting Figure 202
STABILIZER TRIM POSITION INDICATORS
ALTERNATE ELECTRICSTABILIZER TRIM SWITCHES
STABILIZER TRIM CUTOUT SWITCHES
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MAINTENANCE MANUAL
(2)
The horizontal stabilizer is at the neutral rig position when the "B" dimension is at 7.42 |0.05 inches (188.5 |1.3 millimeters) and the stabilizer position indicator is at 3 units of trim (Fig. 202).
(3)
The "B" dimension is the distance along the ballscrew between the surfaces of the ballnut stop and the ballscrew stop.
