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11.  Leading Edge Slat Trailing Edge Gap Mismatch Record
 A.  Check that leading edge slat trailing gaps are per Fig. 506.
12.  Flight Controls Surface Mismatch Record
A.  Figure 504 conveniently summarizes the control surfaces mismatch dimensions. It should be used to check for mismatch prior to first flight after major overhaul, rigging, or replacement of a control surface. The mismatch record will also be useful for isolating problem areas following flight crew trim discrepancy reports. A continuous mismatch record may be kept for each airplane. This will spotlight possible trouble areas at an early time, rather than after excessive trim problems are encountered.
500 
May 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-09-400 Page 519 

G03006
737 Flight Controls Surface Mismatch Record  501 
27-09-400  Figure 504 (Sheet 1)  Oct 20/85 
Page 520 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

501  737 Flight Controls Surface Mismatch Record 
Feb 20/89  Figure 504 (Sheet 2)  27-09-400 
Page 521 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

G42327G03058 G03064
 Mid-to-Aftflap Gap Measurement  500 
27-09-400  Figure 505  Feb 20/89 
Page 522 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

513  Leading Edge Symmetry Mismatch 
May 15/78  Figure 506  27-09-400 
Page 523 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Trim Correction Graphic Aid  500 
27-09-400  Figure 507  May 15/78 
Page 524 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FLIGHT CONTROL SHEAR RIVETS - MAINTENANCE PRACTICES
1.  Shear Rivets
A.  Shear rivets provide a means by which normal operation of essential flight systems can be maintained in the event of failure or jamming of related or interconnected secondary systems. Each shear rivet location is marked by a placard or marker stating Shear Joint and the quantity and type of shear fastener used. The accompanying chart contains a list of all shear joints used in the flight control systems along with part numbers and references to maintenance manual sections where maintenance procedures can be found.
Subject No. Rivet Type  Part Containing Fastener
27-11-101 BACB30GP6-5 Aileron Bus Drums 27-61-41 MS 20470D Spoiler Control Quadrant 27-61-61 BACBB4ADAPTER Flight Spoiler Control Quadrant
500 
May 15/81  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-09-500 Page 201 

FLIGHT CONTROLS SURFACE - INSPECTION/CHECK
1. General
A.  The following section defines the allowable limits for trailing edge movement of flight control surfaces with the airplane on the ground.
B.  Measurement is to be made with control surface in approximate faired position at surface inboard trailing edge unless otherwise noted.
C.  Movement within limits is acceptable provided that the wear at the mechanical parts is distributed evenly throughout the points in the system. However, if inspection and checking reveals that wear is noticeably present at a local area, then that portion of the system should be restored to serviceability.
2.  Equipment and Materials
A.  Dial Indicator - Accurate to 0.001 inch
B.  Spring Force Scale, Push Type - Capable of 33 ±0.2 pounds
C.  Mounting Device to hold the dial indicator
3.  Ailerons and Aileron Tabs (Fig. 601)
A.  Do a check of the play of one aileron with no movement of the opposite aileron or the control wheel:
WARNING:  KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES AND THE LANDING GEAR WHEN HYDRAULIC POWER IS SUPPLIED. THE AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, STABILIZER, LANDING GEAR AND THRUST REVERSERS CAN MOVE QUICKLY WHEN SUPPLIED WITH POWER BY THE HYDRAULIC SYSTEMS. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(1)  
Pressurize the aileron trim control hydraulic systems A and B (Ref 27-11-0, MP).

(2)  
Make sure the control wheel is centered.

(3)  
Attach a mounting device to the top wing structure (outboard of the aileron) and do these steps:

(a)  
Attach the dial indicator so you can take measurements from the outboard corner of the aileron trailing edge.

　
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