A
737-300/400/500MAINTENANCE MANUAL
 FLAP LIMIT SWITCHES - ADJUSTMENT/TEST
_____________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is an adjustment and a functional test of the flap limit switches. The limit switches included in these tasks are the FLAPS UP and the FLAPS DOWN switches. These two switches and five other flap position switches are installed on the forward part of the flap control unit.
 TASK 27-51-87-825-001
 2.  Flap Limit Switch Adjustment____________________________
 A.  Special Tools and Equipment
 (1)  
Ohmmeter

 (2)  
Wrench Set - F80197-5

 B.  
References

 (1)  
24-22-00/201, Manual Control

 (2)  
27-51-00/201, Trailing Edge Flap System

 (3)  
27-51-32/401, Inboard Flap Track Fairing

 C.  
Access

 (1)  
Location Zone
 101, 102 Control Cabin
 217 Right Main Wheel Well

 D.  
Prepare for the Adjustment

 S 865-002
 (1)
Do this task: "Supply Electrical Power" (Ref 24-22-00/201).

 S 865-003

 (2)  
Do this task: "Hydraulic System B Pressurization"
 (Ref 27-51-00/201).

 S 865-004

 (3)  
If the flaps are extended, put the flap control lever in the UP detent to retract the flaps.

 S 865-005

 (4)  
Stop for 2 minutes with hydraulic system B pressurized and the flap control lever in the UP detent.

 NOTE:____The flap power unit can move during this time. The movement will be small, and will be different on different airplanes.
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737-300/400/500MAINTENANCE MANUAL
 (5)  S 865-006Do this task: "Hydraulic System B Depressurization" (Ref 27-51-00/201).
 (6)  S 015-007Do this task: "Inboard Flap Track Fairing Removal" (Ref 27-51-32/401).
 NOTE:____ You can remove the No. 4 or the No. 5 flap track fairing. The procedure refers to the No. 4 fairing and ballscrew. You can use the No. 4 or the No. 5 ballscrew to do the adjustment.
 (7)  S 225-008Measure the Dimension X at the No. 4 ball screw (Fig. 502). (a) Write down this dimension as X1. 

SEE A
FLAPS 10-DEGREE SWITCH, S584
RETAINING NUTS
PIN
ROLLER GUIDE
(EXAMPLE)
FLAPS UP
SWITCH,
S245

STALL WARNING
SWITCH, S856
INBD
B
SWITCH COVER BSEE  UNIT CONTROL FLAP 
SWITCH, S290 MACH TRIM 
SWITCH, S138 LANDING WARNING  FWD  INBD
A 
SWITCH, S130 TAKEOFF WARNING 
SWITCH, S246 FLAPS DOWN 
Flap Flap Control Unit Figure 501 

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737-300/400/500
MAINTENANCE MANUAL

SEE  A 
FLAP TRANSMISSION ASSEMBLY  UPSTOP  DOWNSTOP  DOWNSTOP 
BALLSCREW NUT  BALLSCREW 
SCREW YOKE  UPSTOP BSEE  A  FWD 
(SCREW YOKE) UPSTOP  UPSTOP (BALL NUT) 
DIMENSION "X" 
B 
Ballscrew Figure 502 

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A
737-300/400/500MAINTENANCE MANUAL
 S 015-009
 (8)
Remove the switch cover from the flap control unit (Fig. 501).

 S 865-010
　
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