(3)  
AMM 27-51-87/501, Flap Limit Switches

 (4)  
AMM 27-88-21/501, Flaps 10-Degree Switch

 (5)  
AMM 27-88-31/401, Stall Warning Switch

 (6)  
AMM 31-26-23/401, Flap Takeoff Warning Switch

 (7)  
AMM 31-26-12/401, Flap Landing Warning Switch

 E.  
Access

 (1)  
Location Zone
 217 Right Main Wheel Well

 F.  
Procedure

 S 835-002
 (1)  
Adjust the flap cables WFFA and WFFB (Fig. 502):

 (a)  
Make sure the index mark on the shaft and the mark on the shaft retainer of the flap power unit align in the limit of |0.03 inch.

 (b)  
If the index marks do not align, adjust the flap power unit: 1) Remove the screws that attach the two coupling sleeves on

 the torque tubes to the flap power unit. 2) Disconnect the torque tubes from the flap power unit. 3) Move the flap bypass valve to BYPASS (Position 2). 4) Use the flap drive adapter to turn the flap power unit
 until the index marks align in the limit of |0.03 inch.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE A
SEE B
LIMIT SWITCH COVER
FLAP CONTROL VALVE TRAILING EDGE 
SEE  C  LEADING EDGE FLAP CONTROL VALVE 
FWD 
NOTE:____  A Figure 501 (Sheet 1) Flap Control Unit Adjustment THE FLAP CONTROL UNIT IS SHOWN WITH THE LOWER PAN REMOVED 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL 
|0.010 INCH SURFACE INDEX 
PIN F-1 RIG 
VALVE SLIDE 
B 
CAM  CAM FOLLOWER 
THREAD ENGAGEMENT 1.00 INCH MAX. 
LEADING EDGE LINK  FWD 
CHECKNUT  0.19 INCH MAX. 0.94 INCH MAX.  TRAILING EDGE CAM LINK  C  SEE  INBD D 

TRAILING EDGE CAM LINK  SLEEVE  D  CHECKNUT 
Flap Control Unit Adjustment Figure 501 (Sheet 2) 

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 ú  01  Page 503
 ú  Mar 15/91 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 5) Connect the torque tubes to the flap power unit.
 NOTE: If you will do the transmission adjustment, it
____ is not necessary to connect the torque tubes. You will connect the torque tubes during the transmission adjustment.
 a) Put the torque tubes on the flap power unit. b) Put the sleeves in their position and install the screws. c) Install the lockwire on the heads of the screws.
 (c)  
Make sure that you can install the rig pin F-1 freely in the flap control unit (Fig. 501).

 (d)  
Adjust the tension in the cables WFFA and WFFB to the correct tension shown in Fig. 502. 1) Make sure that you can install the rig pin F-1 freely.

 (e)  
Install the lock clips on the turnbuckles.

 (f)  
Remove the rig pin F-1.

 S 825-003
 (2)  
Adjust the flap control valves (Fig. 501):

 (a)  
Make sure that the flap control lever is in the UP detent.

 (b)  
Install the rig pin F-1 in the flap control unit.

 (c)  
Make sure the valve slide and the index surface of the control valve for the trailing edge flaps align in the limit of |0.010 inch.

 (d)  
If the valve slide and the index surface do not align in the limits, adjust the cam link for the trailing edge flaps: 1) Remove the lockwire from the cam link. 2) Loosen the two checknuts on the cam link. 3) Adjust the sleeve to align the valve slide and the index
　
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