(4)  
Adjust torque tubes for 15-unit discrepancy as follows:

(a)  
Provide system A hydraulic power (Ref 27-51-0).

(b)  
Position flap control lever in 15-unit detent.

(c)  
Remove system A hydraulic power and depressurize hydraulic system A  (Ref 27-51-0).

(d)  
If reported discrepancy is right wing heavy condition requiring excessive left trim, proceed as follows: 1) Remove screws attaching torque tube coupling sleeves to splines to disconnect

torque tubes from inboard coupling of No. 2 and/or 7 flap transmission.
2)  Rotate torque tube to lower right outboard flap or raise left outboard flap or some combination of both to obtain required correction. See Fig. 501 for amount of correction.
NOTE:  One turn (360 degrees) equals 96-degree flap transmission rotation.
If a lateral trim torque tube correction cannot be made with flaps in 15-unit position due to the ball screw nut upstop exceeding 1/4 to 5/6 turns from contact at FLAP UP position, a shim correction shall be made. See Fig. 501 to determine the control wheel position change that will occur with flaps in 15-unit position. A shim correction for flaps in 15-unit position will affect lateral trim for FLAP UP.  See Fig. 501 to determine control wheel position change that will occur for FLAP UP position.
(e)  If reported discrepancy is left wing heavy condition requiring excessive right trim, proceed as follows: 1) Remove screws attaching torque tube coupling sleeves to splines to disconnect
torque tubes from inboard coupling of No. 7 and/or 2 flap transmission.
501 
Feb 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-09-400 Page 511 

2)  Rotate torque tube to lower left outboard flap or raise right outboard flap or some combination of both to obtain required correction. See Fig. 501 for amount of correction.
NOTE: One turn (360 degrees) equals 96-degree flap transmission rotation.
If a lateral trim torque tube correction cannot be made with flaps in 15-unit position due to the ball screw nut upstop exceeding 1/4 to 5/6 turns from contact at FLAP UP position, a shim correction shall be made. See Fig. 501 to determine the control wheel position change that will occur with flaps in 15-unit position. A shim correction for flaps in 15-unit position will affect lateral trim for FLAP UP.  See Fig. 501 to determine control wheel position change that will occur for FLAP UP position.
(f)  Connect torque tubes, secure couplings and lockwire heads of torque tube coupling screws.
CAUTION:  DO NOT APPLY END LOAD TO TRANSMISSION INPUT SHAFT WHEN INSTALLING TORQUE TUBES.
(5)  
Provide system A hydraulic power (Ref 27-50-0).

(6)  
Position flap control lever in FLAP UP detent.

(7)  
Operate trailing edge flaps by moving flap control lever from FLAP UP to FLAP DOWN (40-unit) position and back to UP. Pause at UP and DOWN position to allow flap to respond fully. Repeat for at least 2 cycles and check the following:

(a)  
The ball screw nut upstop must stop in the range of 1/4 to 5/6 turns from contact at FLAP UP position.

(b)  
The ball screw nut downstop must stop at least 1/8 turn from contact at FLAP DOWN (40-unit) position.

(8)  
If the ball screw upstop exceeds 5/6 turn at FLAP UP position, recheck the following:

(a)  
The ball screw nut downstop must stop at least 1/8 turn from contact at FLAP DOWN (40-unit) position.

(b)  
With flaps in up position, check that clearance of seal support (on wing lower trailing edge panel) with respect to leading edge of midflap is 0.003 to 0.06 inch. If adjustment is necessary, loosen seal support retaining screws, position seal support to obtain clearance and tighten retaining screws. Fil1 gap between skin and seal support with pressure, environmental and fuel cavity sealant.

(9)  
Check flap asymmetry shutoff mechanism (Ref 27-51-301 MP).

(10)
Check flap position transmitters (Ref 27-58-0 AT).

(11)
Check spoiler to flap clearance (Ref 27-61-0 AT and 27-62-0 AT).

(12)
Check that outboard flap leaf springs are deflected 0.42 to 0.62 inch when flaps are retracted.

(a)  
Position flap control lever in FLAP DOWN (40-unit) detent to extend flaps.

(b)  
Measure dimension A as shown in Fig. 502.

(c)  
Position flap control lever in FLAP UP detent to retract flaps.

(d)  
With flaps in retracted position, check that dimension A is 0.42 to 0.62 inch less than in step (b).

(e)  
If leaf spring is not properly positioned, add or remove shims to obtain proper deflection. 1) Position flap control lever in FLAP DOWN (40-unit) detent to extend flaps. 2) Remove three fasteners securing leaf spring. 3) Add or remove shims and reposition tapered filler as required.
　
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