b) Install the four washers and nuts.
c) Tighten the 1/4-inch nuts to 50-70 pound-inches.
d) Tighten the 5/16-inch nuts to 100-140 pound-inches.
e) Install the cotter pins in the nuts.

6)  Install the access panels.
(19) Adjust flap jackscrew preload cup (Fig. 505).
(a)  
If installed, remove aft fairing.

(b)  
Remove flap jackscrew preload cup from aftflap.

(c)  
With flaps retracted, measure dimension B. If dimension B is within limits, proceed to step (d) if not, adjust shims in gimbal as follows: 1) Position flap control lever to FLAP DOWN detent. 2) Support flap so that weight of flap is not on trunnions. Loosen gimbal bushing

clamp-up bolts. Remove gimbal bushing retaining bolts and slightly withdraw horizontal bushings to free shims. Adjust shim laminations to attain dimension B (Section A-A, Fig. 504).
NOTE:  A 0.003-inch shim lamination will change dimension B 0.0167 inch. Transfer shim equally to maintain 0.006- to 0.010-inch clearance between bushings and gimbal. Also clearance between inner faces of midflap gimbal attach fitting and gimbal shall be 0.01 inch minimum.
Oct 20/91 27-51-72 Page 508A/508B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

G16598 G17441
535  Flap Jackscrew Preload Cut Adjustment 
May 15/78  Figure 505 (Sheet 1)  27-51-72 
Page 509 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Flap Jackscrew Preload Cut Adjustment  535 
27-51-72  Figure 505 (Sheet 2)  Oct 20/84 
Page 510 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3)  Install gimbal bushing retaining bolts, and tighten gimbal bushing clamp-up bolts to 60-85 pound-inches.
(d)  With flaps extended, check that jackscrew end fitting has 0.03-inch minimum vertical clearance with fitting on midflap. If clearance is not adequate, adjust ball nut shims as follows: 1) Support flap so that weight of flap is not on trunnions. Remove ball nut bushing
retaining bolts and slightly withdraw vertical bushings to free shims. Adjust shims laminations to attain clearance.
NOTE:  Transfer shims equally to maintain 0.006 to 0.010 inch between bushings and ball nut.
2)  Install ball nut bushing retaining bolts in gimbal.
(e)  
Position flap control lever to FLAP UP detent to retract flaps.

(f)  
During retraction check that flap jackscrew clears all linkage and structure.

(g)  
With flaps retracted place up load on aftflap and measure dimension A.

(h)  
Position flap control lever to 1-unit position to partially extend flaps.

(i)  
Install flap jackscrew preload pad and shim so that dimension C is as specified in Detail B, Fig. 505.

NOTE:  If dimension C is greater than specified when no shims are installed, dimension A may be increased, as required, per step (d).

(j)  
Position flap control lever to FLAP UP detent.

(k)  
Check that flap jackscrew end fitting enters preload pad slightly before flap full up position and seats firmly against preload pad when flap is retracted.

(l)  
Position aft fairing on center fairing and install attaching screws.

(m)  
Check aftflap operates smoothly with no binding or structural interference.

(20)
With flap in normal retracted position, measure and record dimension X from ball bearing nut to upstop on jackscrew for inboard transmission assembly of outboard flap. This dimension will be called X1.

(21)
Provide system A hydraulic power (Ref 27-51-0).

(22)
Position flap control lever to FLAP DOWN (40-unit) detent.

(23)
Two minutes after flaps are extended, measure dimension X2 from ball bearing nut to upstop on jackscrew on inboard transmission assembly. Check that dimension X2-X1 is

21.48 to 21.95 inches and that jackscrew and ball bearing nut do not contact. If X2-X1 is not within limits, adjust ballscrew (Ref 27-51-01 A/T).

(24)
Check seal at leading edge of aftflap. When fully retracted, aftflap leading edge shall be

0.15 +0.03 inch aft of seal retainer. Determine position and adjust as follows:
(a)  
With aftflap extended mark a line on lower surface of aftflap 2.00 inches aft of leading edge.

(b)  
Retract aftflap then mark a line on lower surface of midflap 2.15 inches forward of line marked in step (a).

(c)  
With aftflap extended check that aft face of seal retainer vertically aligns with line marked in step (b).
　
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