D.  With flap supported so that weight of flap is off trunnions, remove three bolts through each jackscrew fitting (horizontal plane) and remove gimbal bushings and retainers from fitting  (Fig. 403). Note location and number of shims to ensure proper installation. Maintain position of ball nut on jackscrew to retain transmission adjustment. Support jackscrew using flap drive screw support assembly.
E.  Remove carriage stop from lower surface of flap track (Fig. 401).
F.  Using sling or other suitable means of supporting flap, roll flap aft and down off flap tracks.
CAUTION:  DO NOT ALLOW SLING CABLES TO CUT TRAILING EDGE OF SPOILERS. DISCONNECT SPOILERS AND FOLD FORWARD IF NECESSARY TAKING CARE THAT THEY DO NOT FOUL WITH ESCAPE ROPE ATTACHMENT FITTING.
NOTE: The mid and aft flap assembly weighs approximately 250 pounds.
G.  If a different midflap is to be installed on airplane:
(1)  
Remove bolts connecting aftflap pushrods to aftflap (Fig. 401).

(2)  
Remove bolts connecting fairing support pushrods to flaptrack fairing support arms (Fig. 402).

(3)  
Remove bolts connecting flap track fairing support pushrods, to flap carriages.

(4)  
Remove access panels from upper surface of midflap to gain access to each carriage bearing support.

(5)  
Remove bolts attaching carriage bearing support to midflap forging.

(6)  
Remove and record thickness of shims installed between each carriage bearing support and forging. If shims removed are intact, save for installation on replacement flap.

5.  Install Outboard Trailing Edge Flap
A.  If a replacement midflap is to be installed:
(1)  
Position flap track fairing support arms on flap carriages and install attaching bolts (Fig. 401 and 402).

(2)  
Position fairing support pushrods on fairing support arms, secure each with bolt washer and nut. Tighten nut and install cotter pin.

(a)  Make sure the starting length of the fairing support pushrods is 7.40 +0.10 inch.

(3)
Connect aft pushrods to aftflap with boltheads up. Tighten nuts and install cotter pins.

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27-51-72 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/92 

CAUTION:  BOLTS MUST BE INSTALLED WITH HEADS UP TO PREVENT BOLTS FROM DAMAGING MIDFLAP AND/OR AFTFLAP PUSHRODS AND AFTFLAP.
DO NOT INSTALL WASHERS ON BOLT HEAD. THE WASHER INSTALLATION CAN CAUSE DAMAGE TO THE MIDFLAP AND AFTFLAP.
(4)  
Apply grease liberally around slotted hole and on bearing periphery at aft end of carriage spindle.

(5)  
Position carriage bearing support over end of flap carriage with shims installed between carriage bearing support and midflap forging, install bolts with washers and nuts (Fig. 402). Tighten 3/8-inch nut 160 to 190 pound-inches. Tighten 5/16-inch nut 100 to 140 pound-inches.

NOTE: Use shims removed in step 4.G. (6) or shims of equal thickness.
B.  Using sling or other suitable means of supporting flap, and with toggle forward roller down in track detent, start flap carriages together on flap track and roll forward. With flap carriages near aft end of tracks, check that clearance between flap track web and end of each of the four carriage track roller bolts is 0.050 inch minimum (Section C-C, Fig. 401). If clearance is less than 0.050 inch, correct as follows:
CAUTION:  DO NOT ALLOW SLING CABLES TO CUT TRAILING EDGE OF SPOILERS. DISCONNECT SPOILERS AND FOLD FORWARD IF NECESSARY TAKING CARE THAT THEY DO NOT FOUL WITH ESCAPE ROPE ATTACHMENT FITTING.
(1)  
Remove flap from tracks.

(2)  
Remove track roller bolts and add shims under head of bolt as required to increase clearance between bolt and track web. Install cotter pin so it does not extend beyond end of roller bolt.

C.  Roll flap forward on tracks.
D.  Install carriage stops on lower flange of flap track as follows.
(1)  
Locate stop and install bolts.

(2)  
Roll flaps aft and check clearance between carriage and carriage stop is 0.06 inch minimum with airload rollers contacting flap track.

NOTE: Flaps must be lifted for airload rollers to contact flap track.

(3)  
Fully extend flaps. Check engagement between carriage and carriage stop is 0.05 inch minimum with deadweight rollers contacting flap track.

(4)  
Roll flaps forward to clear stops.

(5)  
Lockwire adjacent bolts.

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Aug 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-72 Page 405 

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Outboard Trailing Edge Flap Positioning  535 
　
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