27-51-73
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLAP CONTROL UNIT - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task for the removal and a task for the installation of the flap control unit.
 B.  The flap control unit includes the flap control valves for the leading edge and the trailing edge flaps, the control linkage, the follow-up linkage, and the flap limit switch actuation cams. The flap limit switches are installed on the flap control unit but they are not part of the replacement control unit assembly.
 TASK 27-51-74-004-001
 2.  Flap Control Unit Removal_________________________
 A.  Special Tools and Equipment
 (1)  
F80197-5 Wrench Set

 B.  
References

 (1)  
27-51-00/201, Trailing Edge Flap System

 C.  
Access

 (1)  
Location Zone
 217 Right Main Wheel Well

 D.  
Procedure

 S 864-002
 (1)  
Retract the trailing edge flaps if it is necessary:

 (a)  
Do this task: "Hydraulic System B Pressurization" (AMM 27-51-00/201).

 (b)  
Put the flap control lever in the UP detent to retract the flaps.

 (c)  
Do this task: "Hydraulic System B Depressurization" (AMM 27-51-00/201).

 (2)
Remove the lower pan from the flap control unit (Fig. 401):

 (3)  
Remove the switch cover from the flap control unit.

 S 034-005

 (4)
Remove the flap limit switches from the flap control unit:

 (a)  
Use the wrench set to remove the limit switches.

 (b)  
Install a tag on each switch to identify the correct switch location.

 (c)  
Install the retaining nuts and roller guides on the switches.

 S 014-003
 S 014-004
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 27-51-74
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 
MOUNTING STUD 
FLAP CONTROL UNIT  (3 LOCATIONS) 
LEADING EDGE 
FLAP CONTROL VALVE 
FLAPS 10-DEGREE SWITCH 

SWITCH COVER
TRAILING EDGE FLAP CONTROL VALVE
SWITCHES (7 LOCATIONS)
MOUNTING BOLT (4 LOCATIONS) FWD
SEE D
SEE C
NOTE:THE FLAP CONTROL UNIT IS SHOWN WITH THE LOWER PAN REMOVED.
A
Flap Control Unit Installation Figure 401 (Sheet 1)
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 27-51-74
 ALL  ú ú 01 Page 402 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

INPUT CRANK FLAP CONTROL UNIT 
FWD 
QUADRANT SHAFT FLAP CONTROL  B  (2-1/2 TURNS) CABLE WFFB 
CABLE GAURD 

CAM FOLLOWER  (1-1/2 TURNS) CABLE WFFA  C  FOLLOW-UP DRUM  FWD 
RIG PIN F-1 
CAM 
LEADING EDGE LINK THREAD ENGAGEMENT 1.00 INCH MAX 
TRAILING EDGE CAM LINK 
FWD 
D  Figure 401 (Sheet 2) Flap Control Unit Installation 

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 27-51-74
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 034-006
 (5)  
Remove the cables WFFA and WFFB from the follow-up drum.

 (a)  
　
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