(g)
Move the trim switches to LEFT WING DOWN and hold the switches until the movement of the control wheels stops.
(h)
Turn the captain's wheel counterclockwise to the 85-degree position and then clockwise to the 85-degree position. Release the wheel.
(i)
Make sure the captain's wheel goes back counterclockwise to the neutral position.
(j)
Make sure the control wheels and the trim control system are again at the neutral position.
S 722-046
(3)
Do a test of the trim system at the center:
(a)
Operate the trim switch to turn the control wheel to the neutral position as shown by the trim indicator.
(b)
Manually move the wheel clockwise to a position of 1 unit of trim. Release the wheel.
(c)
Make sure the wheel goes back approximately 2 degrees from the neutral position.
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747-400 MAINTENANCE MANUAL
(d) Do steps (b) and (c) again but move the control wheel counterclockwise.
TASK 27-11-06-202-047
7. Aileron Trim Actuator and Trim and Feel Mechanism Inspection/Check
__________________________________________________________________
A. General
(1)
This procedure is to do a load check/adjustment of the trim feel and centering springs.
(2)
This procedure is an examination of the worn areas of the link/bearing (2), link/bushing (26), sleeve/bearing (32), link/bolt (33), bushing/bolt (34) and bracket/bushing (35).
B.
Standard Tools and Equipment
(1)
Micrometer, to measure internally and externally
C.
Consumable Materials
(1)
C00528 Corrosion Preventive Compound - MIL-C-16173, grade 2
D.
References
(1)
Paragraph 2. through 5.
E.
Access
(1)
Location Zone
135 Wing Landing Gear Well, LH
136 Wing Landing Gear Well, RH
F.
Do a Load Check/Adjustment to the Trim Feel and Centering Springs.
S 432-062
(1)
Install rig pin A/S-2 in the trim feel and centering unit.
S 022-063
(2)
Remove the aileron trim actuator.
S 492-064
(3)
Attach a push-pull scale to the hole where the upper end of the trim actuator was attached.
(4)
Apply a force vertically (up or down) at this location.
S 012-065
NOTE: You can get easier access if you remove the cover of the trim
____
feel and centering unit.
S 822-066
(5) Make sure the force to move the roller out of the cam detent is 10.2 to 11.7 pounds (Torque= 28 to 32 inch-pounds).
NOTE: The cam roller is out of detent when a shim of 0.002-0.004
____ inch can be installed between the roller and cam on the unloaded side.
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747-400 MAINTENANCE MANUAL
S 822-067
(6)
If the force reading is not between 10.2 pounds and 11.7 pounds do the adjustment that follows:
(a)
Remove one spring.
(b)
Adjust the other spring such that you can move the roller out of detent when you apply a force between 5.1 and 5.9 pounds
(c)
Install and adjust the spring removed earlier such that you can move the roller out of the cam detent when you apply a force between 10.2 and 11.7 pounds.
G.
Do a Check of the Aileron Trim Actuator and Trim and Feel Mechanism
S 022-048
(1)
Remove the aileron trim actuator and the trim and feel mechanism (Refer to par. 2 and 4).
S 222-049
(2)
Do a check of the aileron trim actuator and trim and feel mechanism (Fig. 201):
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本文链接地址：747-400 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 1(107)
