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NOTE: Flap drive screw preload is adjusted by increasing or decreasing thickness of shims
(15) as described in AMM 27-51-12, Inboard Trailing Edge Flap - Removal/Installation. Normally, no readjustment will be required if total thickness of shims installed with gimbal shaft is identical to total thickness of shims removed with gimbal shaft.
F.  At outboard carriage, remove outer plate (3).
G.  Position foreflap to align pivot rollers (16) with access holes in cams (7) and (9). Remove pivot rollers.
NOTE:  If inner carriage half (5) is not being removed, removal of inner pivot roller will not be necessary.
H.  Remove remaining carriage retaining bolts (2) nearest to end of torque shaft and two bolts through plate (10) and carriage half (8). Remove carriage half.
I.  If carriage half (5) is to be replaced, remove remaining bolts (2). Rotate carriage half to clear foreflap toggle assembly and pull carriage half from torque shaft (4). Remove plate (10) from carriage half.
NOTE:  Removal of both carriage halves is necessary only when the second carriage half is to be replaced. Carriage halves are not matched parts and are individually replaceable.
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27-51-21 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Sep 20/81 

J.  Remove cam (7) or (9) and all rollers from carriage half being replaced. Retain shims used under side roller assembly.
4.  Install Midflap Carriage (Fig. 401)
A.  On replacement carriage half (5 or 8), install cam (7) or (9) and carriage rollers removed from old carriage. Install cam and rollers as follows:
(1)  
Install aft roller, bolt and nut. Tighten nut to between 200 and 500 pound-inches torque. Shims may be installed between roller and carriage half if necessary to align cotter pin holes. Install cotter pin and bend ends of pin around sides of nut. Cotter pin must not be bent over end of bolt.

(2)  
Attach forward and side rollers and retaining bolts to carriage half for later installation.

(3)  
Mount foreflap actuating cam on top of carriage half. Coat bolt and contacting surfaces of cam and carriage with a thin film of grease. Tighten bolts to between 10 and 30 pound-inches torque and install cotter pins.

B.  Install carriage halves (5) and (8) on torque shaft (4). Dip attaching bolts in primer and install while primer is wet. Install plate (10), and, at outboard carriage, install inner plate (3). Install nuts on retaining bolts.
NOTE:  Inner plate (3) and the top edge of plate (10) are retained by carriage half retaining bolts.
C.  At outboard carriage, install outer plate (3).
D.  Position foreflap so that toggle assembly is aligned with access. Coat all surfaces of pivot roller and shaft with a thin film of grease. Install spacer on roller shaft and install roller through access hole in foreflap cam. Install washer between foreflap arm and toggle assembly. Install washer and nut on roller shaft and tighten to between 50 and 100 pound-inches torque. Install cotter pin.
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Aug 01/96  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-21 Page 405 

E.  Install gimbal shaft (14) in end of torque shaft (4). Coat outside diameter of index plate or bearing retainer with corrosion preventive compound. Install same total thickness of shims (15) under index plate (12), or bearing retainer (19), as were removed with gimbal shaft. Refer to paragraph 3, step E.
F.  For outboard gimbal shaft only; set index plate (12) at position marked prior to removal.
G.  Install two gimbal shaft retaining bolts (13).
H.  For outboard carriage only, attach crossbeam (17) to carriage for installation when flap is installed on airplane.
I.  For carriage half (5) of inboard carriage, mount pulley and boom roller support (6) on outboard side of carriage half and install side roller assembly, with shims, on inboard side. Install side roller assembly with roller pin head down to facilitate lubrication. Dip bolts in primer and install while primer is wet. Install cotter pins in two forward bolts.
J.  For carriage half (5) of outboard carriage and for either carriage half (8), install shims and side roller with roller pin head down for easy access to lubrication fitting. Install bolts with wet primer.
K.  Check and adjust side rollers as follows:
(1)  
Tighten two roller mounting bolts to between 30 and 40 pound-inches torque.

(2)  
Locate midpoint between carriage halves (5) and (8) at side rollers.

(3)  
Check that distance between side rollers is 1.40 to 1.41 inches.

(4)  
Check that distance between each roller and midpoint between carriage halves is 0.70 to
　
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