27-58-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 737-300/400/500MAINTENANCE MANUAL 
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY  
not within tolerance zone Indicator pointer Indicator pointer for one flap does not move when flaps move  indicator defective Flaps are not properly Flap position transmitter out of adjustment Flap position transmitter extending defective Flap position  Check for 28V AC at transmitter plug pin 11 Visually inspect flap position that pointer is within tolerance zone at flaps up Retract flaps and check Check for 28V AC at indicator plug pin 5 (left indicator) or pin 2 (right indicator  Replace transmitter Adjust transmitter (AMM 27-58-41/401) Adjust flap drive system Repair wiring or Repair wiring or Replace indicator  
functioning Flap asymmetry test switch not  between pin 3 and 8 Check switch for continuity and pin 2 and 7 (left flaps) or between pin 4 (right flaps) and 9 and pin 5 and 10  Replace switch 
Trailing Edge Flap Position Indicating System Trouble Shooting Chart Figure 101 
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 27-58-01
 ALL  ú ú 01 Page 102 ú Jul 12/99 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 
737-300/400/500MAINTENANCE MANUAL
 TRAILING EDGE FLAP POSITION INDICATING SYSTEM - ADJUSTMENT/TEST
_______________________________________________________________
 1.  General
_______
 A.  There is one task in this procedure, a functional test of the position indicating system for the trailing edge flaps. You must make sure the trailing edge flap system is adjusted correctly before you do the test of the position indicating system.
 TASK 27-58-01-725-001
 2.  Trailing Edge Flap Position Indicating System Functional Test
_____________________________________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control
 (2)  
27-32-00/501, Stall Warning System
 (3)  
27-51-00/201, Trailing Edge Flap System
 (4)  
27-51-00/501, Trailing Edge Flap System
 B.  
Access
 (1)  
Location Zone
 101, 102 Control Cabin
 C.  
Procedure
 S 865-002
 (1)  
Supply the electrical power (Ref 24-22-00/201).
S 865-003
 (2)  
Supply the system B hydraulic power (Ref 27-51-00/201).
S 825-004
 (3)  
Make sure the trailing edge flap system is adjusted correctly (Ref 27-51-00/501).
 (4) 
Put the flap control lever in the UP detent to retract the flaps.
 (5) 
Examine the pointers on the flap position indicator (Fig. 501):
 S 865-005
 S 725-006
 NOTE: Lightly hit the position indicator with your finger to remove
____
 the friction error.
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