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F.  Roll aftflap slowly forward to retracted position and back to extended position. Check for binding or other evidence of incorrect installation.
NOTE:  Pushrods should be held clear of aftflap while flap installation is checked for binding or other defects.
G.  Install bolts and nuts to connect pushrods to leading edge of aftflap. Do not tighten nuts.
NOTE:  Rod ends are connected temporarily for flap retraction and so that retracted position of aftflap may be checked.
H.  Position ALTERNATE FLAPS arm switch at ARM. Use ALTERNATE FLAPS control switch to retract flaps slowly. Position flap control lever in FLAP UP detent. Position arm switch at OFF.
I.  With flaps fully retracted electrically, check clearance between leading edge of aftflap and trailing edge of midflap bottom skin. Clearance must be large enough to permit retraction of flaps hydraulically to normal retracted position. If necessary, adjust pushrods to increase this clearance.
J.  Provide hydraulic system A power. Refer to AMM 27-51-0. Maintain system pressure for 5 minutes.
K.  Remove hydraulic system A power. Refer to AMM 27-51-0.
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27-51-31 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/79 

L.  Check that distance from bottom trailing edge of midflap to trailing edge of aftflap is 16.00 (+ 0.12) inches as shown in figure 401. Adjust pushrod ends to obtain required dimension. Tighten checknut to engage key and install lockwire. Extend and retract flaps as necessary to make adjustments and check dimensions.
M.  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:
(1)  
With aftflap extended mark a line on lower surface of aftflap 2.00 inches aft of leading edge.

(2)  
Retract aftflap then mark a line on lower surface of midflap 2.15 inches forward of line marked in step (l).

(3)  
Extend aftflap and check that aft face of seal retainer vertically aligns with line marked in step (2).

(4)  
If seal retainer does not align, add or remove shims under seal retainer at each fastener to obtain correct position.

N.  With rod ends and seal retainer properly adjusted, install bolts, washers, and nuts to connect pushrods to leading edge of aftflap. Tighten nuts and install cotter pins.
O.  Pressurize hydraulic system A, extend flaps, and remove system A hydraulic power. Refer to AMM 27-51-0.
P.  Install midflap trailing edge.
Q.  Check gap between midflap trailing edge and top of aftflap with flaps fully retracted. Gap shall be no less than 0.01 inch and no more than 0.15 inch. Adjust rod ends within limits of step L., or replace aftflap or midflap trailing edge to obtain proper gap. Seal compression shall remain within limits of step M.
R.  Provide hydraulic system A power. Refer to AMM 27-51-0.
S.  Operate flaps through one complete cycle. Check aftflap for binding or other evidence of faulty installation.
T.  With flaps retracted, remove hydraulic system A power. Refer to AMM 27-51-0.
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Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-31 Page 405 

INBOARD TRAILING EDGE AFT FLAP -INSPECTION/CHECK
1.  General
A.  This data consists of illustrations and a wear limit chart. There will be no procedure given for gaining access to the component for removal or replacement after inspection for wear. Refer to Inboard Trailing Edge Aft Flap -Removal/Installation for this information.
2.  Inboard Trailing Edge Aft Flap Wear Limits (Fig.601).

G13009
500  Inboard Trailing Edge Aft Flap Wear Limits 
Aug 15/73  Figure 601  27-51-31 
Page 601 
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INBOARD FOREFLAP - REMOVAL/INSTALLATION
1. General
A.  The inboard foreflap may be removed from the airplane when the flaps are partially extended, or it may be removed from the flap assembly after the flap assembly is removed from the airplane.
B.  For removal of the foreflap, the foreflap tracks must be disconnected from the foreflap, or, the foreflap track stops must be removed to permit removal of tracks with foreflap. Removal of foreflap track stops requires removal of the midflap lower surface panels. It is recommended that, with flap assembly on the airplane, tracks be disconnected from the foreflap.
　
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