C.  Remove electric actuator (18, Fig. 401) and autopilot actuator (9) from jackscrew gearbox (8).
(1)  
Disconnect electric connector (11) at actuator.

(2)  
Remove bolt (12), two places, that secures wire bundle clamp support clip to jackscrew gearbox cover.

(3)  
Remove three actuator mounting bolts (15) and remove actuator from jackscrew gearbox.

D.  Remove cable guards from cable drum (24).
(1)  
Remove four forward cable guards (26) and support plate (25) by removing four bolts securing cable guards between support plate (25) and gearbox housing, and nut securing bottom of aft cable guard (23) to support plate.

(2)  
Remove aft cable guard (23) by removing three bolts.

E.  Disconnect STB cable (17) from cable drum.
NOTE:  The spline adapter may be needed to get additional slack to remove the initial cable coil.
F.  At the stab trim gearbox, pull the STA and STB cables aft to remove slack and install cable clamps at the pulley just aft of the pressure bulkhead.
G.  Insert adapter into jackscrew gearbox internal spline. Actuate jackscrew to full stabilizer leading edge up position. As stabilizer is moved, pull STB cable into tail compartment and wind onto spool or reel keeping the cable coils stacked in the same order as they were when on the drum.
H.  With ball nut and jackscrew upper stops in contact, note and record number of turns of STA cable (16) on drum. Tag cable terminal with this information. Disconnect cable from drum, and secure so the coil does not unwind.
I.  Install lower horizontal stabilizer lock. Actuate jackscrew in stabilizer leading edge down direction until stabilizer truss contacts lock. Install upper horizontal stabilizer lock. Tag stabilizer trim control system wheel to prevent further system operation.
NOTE:  If nutplates for locks are occupied by wire bundle clamps, remove wire bundle clamps to allow installation of locks.
502 
27-41-81  Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Apr 01/97 

J.  Connect hoist to jackscrew gearbox.
(1)  
Install hoist adapter on sleeve (7) at base of jackscrew (2).

(2)  
Install hoisting bar between frames at top of compartment above access door.

(3)  
Support hoist on hoisting bar and connect to hoist adapter.

K.  Deleted.
L.  Disconnect bonding jumper (10) from jackscrew gearbox. Retain bonding jumper bolt with jackscrew gearbox.
M.  Remove safety straps (14) at lower gimbal.
N.  Remove two safety bolts (4) from-jackscrew fitting (3) on stabilizer truss.
0.  Disconnect jackscrew from stabilizer.
CAUTION:  STABILIZER IS BALANCED SO THAT 230-POUND FORCE IS REQUIRED TO RESTRAIN UPWARD MOTION OF LEADING EDGE. ENSURE THAT LOCK IS INSTALLED.
(1)  
Remove four bolts and pull two upper gimbal pins (20) from upper gimbal (5).

(2)  
Move ball nut (1) downward to clear jackscrew fitting by rotating jackscrew.

(3)  
Install two upper gimbal pins (20) and secure with four bolts.

P.  Remove cotter pin, nut and washer from each lower gimbal pin (13) and remove the two pins.
CAUTION:  SUPPORT JACKSCREW VERTICALLY WHILE REMOVING PINS.
Q.  Lover jackscrew to clear fitting on stabilizer truss and lower jackscrew with gearbox and ball nut from airplane.
R.  Remove hoist adapter from jackscrew gearbox.
S.  Remove spline adapter from jackscrew gearbox.
T.  Install cable guards (23 and 26) and support plate (25) on jackscrew gearbox.
516 
Feb 01/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-41-81 Page 403 

G10872 G10900
Stabilizer Ball Nut Jackscrew Gearbox Installation  516 
27-41-81 Page 404  Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/86 

516  Stabilizer Ball Nut and Jackscrew Gearbox Installation 
Feb 01/74  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-41-81 Page 405 

4.  Prepare Stabilizer Jackscrew for Installation
A.  Check that autopilot stabilizer trim servo, stabilizer trim actuator, and stabilizer trim control circuit breakers on panel P6 are open.
B.  Remove electric actuator (18, figure 401) and autopilot actuator (9), if installed.
(1)  Remove three actuator mounting bolts and lift actuator to disengage splines from gearbox.
　
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