(2)
Remove support plate (25) and cable guards.
E. Check applicable parts for allowable wear tolerances. Refer to Stabilizer Ball Nut and Jackscrew Gearbox - Inspection/Check.
5. Install Stabilizer Trim Jackscrew Gearbox
A. Hoist jackscrew with ball nut and gearbox (8, figure 401) into airplane. Insert jackscrew through jackscrew fitting on stabilizer truss.
B. Align jackscrew gearbox with lower gimbal.
C. Install lower gimbal pins (13).'
(1)
Install pin with grease fitting outboard.
(2)
Secure pin with washer and nut.
(3)
Install cotter pin.
D. Install safety straps (14, two places).
(1)
Position strap to engage pin on jackscrew gearbox.
(2)
Install each strap with two bolts with head outboard to secure straps.
(3)
Secure each bolt with washer and locknut.
E. Connect jackscrew to stabilizer.
(1)
Remove four bolts and pull two upper gimbal pins (20) from upper gimbal (5).
(2)
Disassemble gimbal fittings (21) and yokes (22) from ball nut.
(3)
Using grease lubricate yoke bushings and faying surfaces between yoke and gimbal fittings.
(4)
Install yokes on ball nut and engage gimbal fittings on yokes.
(5)
Rotate jackscrew to move ball nut upward to engage gimbal fittings (21) with jackscrew fitting (3) on stabilizer truss.
(6)
Install two upper gimbal pins (20) to connect jackscrew to stabilizer.
(7)
Secure pins to gimbal fittings (21) by installing four bolts with washers.
(8)
Lockwire adjacent boltheads on each upper gimbal pin together.
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F. Install two safety bolts (4) in jackscrew fitting (3) on stabilizer truss.
(1)
Brush or swab all areas of safety bolthole with primer.
WARNING: PRIMER IS TOXIC AND FLAMMABLE. USE ONLY IN WELL VENTILATED AREA. DO NOT GET IN EYES OR 0 N SKIN.
(2)
Install safety bolt washer under bolthead. Position bolthead to right.
(3)
Secure bolt with washer and nut.
(4)
Tighten nut finger-tight, then back off nut to nearest cotter pin hole.
(5)
Install new cotter pin.
G. Install bonding jumper (10).
(1)
Remove upper left aft bolt on jackscrew gearbox (8).
(2)
Clean area around bolt to provide electrical bonding.
(3)
Install bolt with bonding jumper under head and securing with washer and locknut.
(4)
Use the milliohmmeter to make sure that the maximum electrical resistance of the bonding jumper connection is 0.010 ohm.
H. Deleted.
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I. Remove hoist adapter from jackscrew and remove hoisting bar and hoist from airplane.
J. Remove upper and lower stabilizer locks. If wire bundle clamps were removed to allow use of locks, secure wire bundles.
K. Lubricate upper and lower gimbals at grease fittings.
L. Insert adapter and operate jackscrew to move stabilizer to full leading edge up position.
M. Apply a light coat of grease to unused jackscrew threads between ball nut and jackscrew upstop.
N. Connect STA cable (16) to cable drum (24).
(1)
Wrap cable onto drum approximately 7-3/4 turns..
NOTE: Check number of turns STA cable had on original cable drum, information is on tag attached to cable.
(2)
Insert cable terminal into lower terminal slot of drum.
(3)
Install lockwire to secure terminal. Insert ends of lockwire into terminal slot.
O. Remove STA cable clamp.
P. Using adapter operate jackscrew to move stabilizer to full leading edge down position. Guide STA cable one coil at a time, onto drum during operation. Maintain tension on STB cable as it unwinds from spool or reel.
Q. Apply a light coat of grease to unused jackscrew threads between ball nut and jackscrew downstop.
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