757
MAINTENANCE MANUAL
S 494-013
(12)
Do the steps that follow to install the removal equipment for the stabilizer ballscrew (Fig. 402):
(a)
Do the steps that follow to lock the stabilizer:
1) Install the four bracket assemblies to the first two upper bulkheads aft of the access door, 311AL.
NOTE: Refer to Fig. 402 for the bracket position on the
____ bulkheads in relation to the airplane centerline.
2) Use the four pins that are supplied to install the I-frame to the brackets. 3) Use the pin that is supplied to install the turnbuckle assembly to the I-frame. 4) Use the bolts and pins that are supplied to install the trunnion assembly to the stabilizer lugs.
NOTE: The stabilizer lugs are on the top of the stabilizer
____
wing box.
5) Install the lateral frame assembly to the front of the I-frame. 6) Turn the turnbuckle assembly until it can be attached to the trunnion with the pin that is supplied.
7) If you turn the turnbuckle assembly and it is too short to connect to the trunnion, do the steps that follow: a) Remove the mid-length pin. b) Extend the turnbuckle until it can be connected to the
trunnion. c) Install the mid-length pin. d) Adjust the turnbuckle and attach it to the trunnion. e) Make sure that the turnbuckle is installed vertically
at the centerline of the airplane.
(b) Do the steps that follow to install the sling: 1) Remove the mid-length safety pin. 2) Install the spring-loaded telescoping beam assembly between
the bulkheads on each side of the access door, 311AL.
NOTE: Refer to Fig. 402 for the beam position in relation
____ to the airplane centerline.
3) Install the mid-length safety pin.
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757 MAINTENANCE MANUAL
4) Install the inverted T-track and trolley between the lateral front frame of the I-beam and the rail hanger of the telescoping beam. Use the two pins that are supplied to install the T-track.
NOTE: This will let you move the stabilizer ballscrew
____ actuator forward and left outboard to a position above the access door.
5) Attach the fishpole hoist to the trolley. 6) Move the trolley to a position above the stabilizer ballscrew actuator. 7) Install the sling around the upper gimbal of the stabilizer ballscrew actuator.
E. Remove the Stabilizer Ballscrew Actuator (Fig. 402)
S 824-014
WARNING:_______ONLY APPROVED PERSONS MUST OPERATE THE LEVER CHAIN HOISTS. DO NOT USE FORCE TO MOVE THE CONTROL LEVER OR KNOB INTO THE NEUTRAL OR THE FREE CHAIN POSITION. THIS CAN CAUSE A CHAIN HOIST WITH A LIGHT LOAD TO RELEASE ITS LOAD. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Adjust the hoist until it holds the weight of the stabilizer ballscrew actuator.
NOTE: A hoist with too much tension will cause the gimbal pins to
____
get caught.
S 034-015
(2)
Remove the two bolts that attach the anti-rotation cables to the actuator housing.
S 034-016
(3)
Do the steps that follow to disconnect the upper gimbal:
(a)
Loosen the bolts for the upper and lower gimbal pins.
(b)
Remove the four bolts that hold the left and right upper gimbal retainers.
CAUTION:_______DO NOT USE METAL TOOLS TO REMOVE THE RETAINERS. DO NOT USE TOO MUCH FORCE TO REMOVE THE GIMBAL. DAMAGE TO THE UPPER GIMBAL AND THE RETAINER FLANGES CAN OCCUR.
(c)
Remove the left and right upper gimbal retainers (4 locations).
NOTE: Use hardwood wedges between the retainer flanges and the
____ gimbal to start the removal of the retainers.
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27-41-10
ALL ú ú 01 Page 409 ú Sep 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 034-017
(4) Do the steps that follow to disconnect the lower gimbal: (a) Remove the two bolts that hold the safety shaft. (b) Remove the four bolts that hold the left and right retainers to the lower gimbal.
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