27-88-00
ALL ú ú 02 Page 110 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K33621
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
LE FLAPS TRANSIT annunciator shows LE FLAPS EXTEND center panel light does not come on when leading edge LE FLAPS EXTEND center panel light on when leading edge surfaces are light not on center panel indication. correct overhead extended; surfaces are not extended module light and M229 connector between wiring or Burned out lamps or failed light assembly Failure in M229 module Short circuit to ground between lamp and M229 module Open circuit in Failure in M229 module to ground. module for short circuit between light and M229 wiring and connectors If light remains on, check the P6-2 panel. circuit breaker, C22, on Open LE FLAP POSN IND-DC Press light assembly. If light assembly does not If light still does not come on, come on, card A22. Replace lamps. assembly. card A22. necessary. circuit. wiring as Replace light Replace M229 module. Refer to OHM 27-56-40 for test and repair. Suspect circuit Repair or replace Check wiring and connectors between light and M229 module for open Replace M229 module. Refer to OHM 27-56-40 for test and repair. Suspect circuit
Troubleshooting Chart
Figure 101 (Sheet 10)
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27-88-00
ALL ú ú 01 Page 111 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
leading edge indication overhead panel indication normal; Center panel abnormal, at any position when leading edge does not come on center panel light LE FLAPS TRANSIT in-transit surfaces are or failed light Failure in M229 module assembly False autoslat signal overhead wiring Open circuit in annunciator or Open circuit in wiring or connector between light and the M229 module Burned out lamps light does not come on, Press light assembly. If Simulate AIR mode by M229 module, connector D728B, pin 56 to ground. If continuity exists, both M1222 and M1223 If continuity exists with removed, do a continuity check from come on, If light still does not come on, on, If light still does not Press TEST button on overhead annunciator panel. If any light does not come pressing test switches, S1 and S3, on the E11 Landing Gear Logic Shelf; module. Refer to connectors between Replace light Check wiring and Replace lamps. assembly. Replace M229 light and M229 module for open circuit. Repair as necessary. Individually remove Autoslat and M1223, to isolate fault. Computers, M1222 short circuit to connectors for Check wiring and as necessary. OHM 27-56-40 for Suspect circuit relay K1. card A22, A34; test and repair. panel as overhead Replace lamp or necessary. circuit between Check for open annunciator and M229 module. Repair as necessary. ground and repair
Troubleshooting Chart
Figure 101 (Sheet 11)
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27-88-00
ALL ú ú 01 Page 112 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
abnormal, at any Center panel indication normal; overhead panel indication leading edge position (Cont) overhead wiring annunciator or Short circuit in Failure in leading edge flap position takeoff warning circuit Failure in M229 module and/or 4, is abnormal, remains on, overhead annunciator light P6-2 panel. If any circuit breaker, C211, on Open LE FLAP POSN IND-DC If any overhead light still remains on, If overhead annunciator indication for flaps 1 annunciator. overhead indicated on edge surface cards for leading Suspect circuit test and repair. OHM 27-56-40 for AMM 31-26-00/501. annunciator panel. as given in takeoff warning edge position Check leading the M229 module. module. Refer to Replace M229 between the Replace the necessary. Repair as annunciator and Check for a short circuit to ground
Troubleshooting Chart
Figure 101 (Sheet 12)
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