27-88-00
 ALL  ú ú 04 Page 104 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K33593
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
LE FLAPS TRANSIT  LE flap or  On slats 2 and 5, with 
center panel light  slat-extend or  proximity sensors S164, 
is on while leading full-extend  S165, S178, and S179 
edge surfaces are  proximity sensor  (part numbers 
in-transit;  or wiring  10-61226-21 or -28), 
overhead  measure the resistance 
annunciator panel  between sensor leads. 
shows one or more  The resistance from the 
surfaces extended  blue to the yellow leads, 
with no associated  must be 44 |2 ohms.  The 
TRANSIT lights.  resistance from the red 
to the yellow leads, 
must be 44 |2 ohms. 
On slats 1, 3, 4, and 6, 
with proximity sensors 
S162, S163, S166, S167, 
S168, S169, S176, S177, 
S180, S181, and 
LE flaps 1 thru 4 with 
proximity sensors S170, 
S171, S172, and S173 
(part no.'s 10-61226-15, 
-26, or -29/1-899-29), 
measure the resistance 
between the sensor leads. 
The resistance from the 
blue to the yellow leads, 
must be 348 |3.5 ohms. 
The resistance from the 
red to the yellow leads, 
must be 30 |3 ohms. 
Replace proximity sensor 
as given in 
AMM 27-88-11/401, 
AMM 27-88-11/501, or 
check sensor wiring for 
open or short circuit. 
Repair as necessary. 

Troubleshooting Chart
Figure 101 (Sheet 4)

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 27-88-00
 ALL  ú ú 04 Page 105 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K33594
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
indication. correct is on when leading extended; (TE flaps 10-40); annunciator shows overhead LE FLAPS TRANSIT center panel light edges are fully  Failure in M229 module  card A22. Replace M229 module. Refer to OHM 27-56-40 for test and repair. Suspect circuit 

Troubleshooting Chart
Figure 101 (Sheet 5)

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 27-88-00
 ALL  ú ú 02 Page 106 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C98509
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
normal annunciation overhead extended; edges are and LE FLAPS on when leading panel lights both EXTEND center LE FLAPS TRANSIT overhead (Cont) correct indication is on when leading extended; (TE flaps 10-40); annunciator shows LE FLAPS TRANSIT center panel light edges are fully  ground between lamp and M229 Short circuit to M229 and Stall Failure in M229 Short circuit to ground between Warning Module module module wiring associated flaps 10-degree switch, S584, or Short circuit in trailing edge  between D728B, pin 54 and to ground. S584, for a short circuit If LE FLAPS TRANSIT light still remains on, check wiring and connectors the P6-2 panel. circuit breaker, C211, on Open LE FLAP POSN IND-DC connector D728A, pin 55 exists, to ground. If continuity Check continuity from M229, If light remains on, check between light and M229 module for short circuit to ground. wiring and connectors ground. If continuity connector D728B, pin 54 to Check continuity from M229 exists,  AMM 27-88-21/501. AMM 27-88-21/401, Repair or replace necessary. wiring as cards A22, A34. Replace M229 module. Refer to OHM 27-56-40 for test and repair. Suspect circuit necessary. repair wiring as Replace stall warning module or necessary. wiring as Repair or replace S584, as given in Adjust or replace 

Troubleshooting Chart
Figure 101 (Sheet 6)

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