(3)
Install bolt with washer and nut (Fig. 502). Tighten 3/8 inch nut 160 to 190 pound-inches and tighten 5/16 inch nut 100 to 140 pound-inches. Install cotter pins.
NOTE: A lateral trim correction for flap up position will affect the flaps at the 15-unit position. To ensure that the correction will not result in a 15-unit flap position trim discrepancy a compensating torque tube adjustment may be required. Refer to Fig. 501 to determine the control wheel position change that will occur with flaps in 15-unit position. If this change when added to flaps at 15-unit recorded wheel position exceeds allowable limits then an adjustment is required. Refer to Fig. 501 to determine the compensating torque tube adjustment required. For details of procedure see par. 3. (Adjust trailing edge flaps for 15-unit discrepancy.)
(4)
Check spoiler to flap clearance (Ref 27-61-0 A/T and 27-62-0 A/T).
(5)
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.
NOTE: Shim thickness between leaf spring and midflap must be changed an equal amount when shim thickness between carriage bearing support and midflap is changed (i.e. add same thickness shim under leaf spring as removed from under carriage bearing support). Tapered filler between leaf spring and midflap may be used individually or at both track locations and may be positioned with thick end forward or aft or reversed relative to each other.
4) Secure leaf spring with bolt at forward attach point.
5) Secure retainer with radius filler, washer and nut at each aft attach point. Tighten 3/8 nut 160 to 190 pound-inches and tighten 5/16 nut 100 to 140 pound-inches. Install cotter pins.
6) Repeat steps (a) thru (d) to check adjustment.
500
27-09-400 Page 506 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/87
G02999 G03003
501 Trailing Edge Flap Adjustment
Aug 01/74 Figure 502 (Sheet 1) 27-09-400
Page 507
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Trailing Edge Flap Adjustment 501
27-09-400 Figure 502 (Sheet 2) Aug 01/74
Page 508
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(5a) If shim thickness between midflap carriage bearing support and midflap forging has been changed, adjust flap jackscrew preload cup (Ref 27-51-72 A/T).
CAUTION: ADJUSTMENT OF SHIM THICKNESS BETWEEN MIDFLAP CARRIAGE BEARING SUPPORT AND MIDFLAP FORGING CHANGES PRELOAD CUP ADJUSTMENT. INCORRECT ADJUSTMENT MAY CAUSE DAMAGE TO PRELOAD CUP.
(6)
Check adjustment of outboard flap track fairings (Ref 27-51-121 A/T).
(7)
Check that clearance between deflection control ramp and roller at outboard end of midflap is per Fig. 502. Adjust, if required (Ref 27-51-72 R/I).
E. Restore Airplane to Normal
(1)
Remove system A hydraulic power (Ref 27-51-0 MP).
(2)
Apply sealant to carriage access panel and midflap faying surface and install access panels on upper surface of midflap.
(3)
The amount of aileron trim required on following flight shall be noted to determine whether or not sufficient correction was made.
3. Adjust Trailing Edge Flaps for 15-Unit Discrepancy
A. It is essential to verify that a misrigged or out of tolerance system is not giving an incorrect trim reading or flight discrepancy. Prior to determining amount of adjustment required following checks shall be made.
(1)
With flaps in up position, check that each outboard flap transmission is positioned so that angular clearance between stop on ball screw nut and upstop on screw yoke is 170 to 190 degrees (1/2 turn +10 degrees) turn (1/4 to 5/6 turn if previous trim correction has been made). If not within limits adjust flap transmissions (Ref 27-51-01 A/T).
