(k)
Install the attachment assembly on the ball screw with the ball lockpin.
(l)
Install the ball nut lock assembly.
(m)
Attach the hoist on the beam and the attachment assembly.
F.
Remove the Upper and Lower Gimbal Pins
S 824-010
(1) Adjust the stabilizer jacks to move the load of the upper gimbal attachment to the actuator fitting of the stabilizer center section.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
BALL SCREW STOP
STABILIZER TRIM
BALL NEUTRAL
NUT
POSITION STOP
1
SEE A SEE B
SEE C
A
1.WASHER
2.
NUT
3.
SPLIT RETAINING RING (HALF)
11. UPPER GIMBAL PIN LOCATING SCREW
3.
SPLIT
4.
BUSHING
RETAINING RING
5.
WASHER
6.
NUT
10.BOLT UPPER 7. INNER GIMBAL
GIMBAL PIN
PIN
8.OUTER GIMBAL PIN
UPPER GIMBAL ATTACHMENTS
1 STOPS IS 7.43 |0.15 INCHES SURFACES OF BALL NUT AND BALL SCREW WHEN DIMENSION BETWEEN NORMAL STABILIZER IS IN NEUTRAL POSITION B
Stabilizer Trim Drive Mechanism Installation
Figure 402 (Sheet 1)
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A
747-400
MAINTENANCE MANUAL
26. HYDRAULIC
BRAKE
UNITS
ANTIROTATION CABLE (2 LOCATIONS)
13. WASHER
12. PIN
14.
SAFETY SHAFT RETAINING BOLT
15.
WASHER
16.
LOWER GIMBAL RETAINING PIN
ZERK FITTING
25. HYDRAULIC MOTORS
17. TUBING SUPPORT BRACKET
24. LOWER GIMBAL (2 LOCATIONS)
RETAINING PIN
BOLT
18. WASHER
23. WASHER
19. NUT
21.
WASHER
22.
NUT
20. LOWER GIMBAL SAFETY SHAFT
LOWER GIMBAL ATTACHMENTS
C
Stabilizer Trim Drive Mechanism Installation
Figure 402 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
S 494-011
WARNING:_______ DO NOT MOVE THE CONTROL LEVER OR KNOB INTO THE NEUTRAL POSITION
WHEN THE LEVER CHAIN HOISTS HOLD ANY LOAD. THE HOISTS CAN
RELEASE THE LOAD AND CAUSE INJURY TO PERSONS OR DAMAGE TO
EQUIPMENT.
(2)
Adjust the hoist until it holds the weight of the mechanism and permits the gimbal pins to move freely.
S 034-012
(3)
Disconnect the hydraulic lines from the hydraulic brake units and the hydraulic motors.
(a)
Seal all the hydraulic lines with plugs and seal the ports with caps.
(b)
Release the hydraulic lines from the supports of the gearbox on the mechanism.
S 034-015
(4)
Disconnect the hydraulic lines from the stabilizer trim control module.
(a)
Remove the hydraulic line for access to the lower gimbal if it is necessary.
(b)
Seal all the hydraulic lines with plugs and seal the ports with caps.
S 034-017
(5)
Remove the pins (12) from the airplane attachment ends of the antirotation cables.
S 034-018
(6)
Disconnect the upper gimbal pins (Fig. 402):
(a)
Remove the nuts (6) that keep the upper gimbal pins (7 and 8) on the locating screws (11).
(b) 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機維護手冊 飛行操縱 FLIGHT CONTROLS 3(174)
