27-81-00
 ALL  ú ú 01 Page 16 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
LEADING EDGE FLAPS AND SLATS - TROUBLE SHOOTING
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Leading edge flaps and slats fail to extend during normal system operation Leading edge flaps and slats fail to extend during alternate system operation flaps and slats do not extend or retract at speci-fied trailing edge flap angle Leading edge  valve Defective leading edge flap and slat control valve Hydraulic fuse (extend or pressure at leading edge standby shutoff valve leading edge standby shutoff Leading edge standby shutoff still in normal (Position 1) (closed) position Leading edge flap and slat control valve out of adjustment No dc power to Low hydraulic closed retract) has  Remove lower pan from flap control unit and disconnect adjustment link from cam follower arm. Manually actuate valve and check leading edge flap opera-tion. If flaps fail to extend -Check that standby hydrau-lic system low pressure warning light is extin-guished. If light is illuminated, refer to Hydraulic System Trouble Shooting, Chapter 29 Remove connector from leading edge standby shut-off valve and check for 28 volts dc. If power is not available, check wiring from valve to power source for open circuit Check that FLAPS VALVES circuit breaker is closed and that alternate flap master switch is at ARM. Retract trailing edge flaps to FLAP UP position. Re-move lower pan from flap control unit and install rigging pin Check for power across standby shutoff valve. If power is not present, valve is defective  Replace leading edge flap and slat control Leading Edge Flap and Slat Control Valve - Removal/ Installation, valve. Ref 27-81-81 fuse (Ref 27-81-61, R/I) Reset hydraulic Repair wiring as required Replace standby shutoff valve. Ref Leading Edge Standby Valve -Removal/ Installation, 27-81-91 Adjust leading edge flap and slat control valve 

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 27-81-00
 ALL  ú ú 01 Page 101 ú Nov 15/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Uncommanded lead-ing edge device extension through standby system with hydraulic surized system B depres-pressure off. slowly. One or more leading edge surfaces operate Leading edge flap droops excessive-ly with hydraulic  Leading edge standby drive shutoff valve is open due to one of the following: Defective leading edge flap or slat actuator Defective leading edge flap actuator  Keep leading edge extended standby rudder switch. Pressurize hydraulic system tion alternate flap drive control switch and alter-nate flap master switch to OFF position. Open flap shutoff valve circuit breaker (P6-2 panel) and by maintaining standby hydraulic pressure using lever to FLAPS UP. Posi-B and position flap control flap shutoff valve circuit breaker and check for the following: position standby drive shutoff valve position lever midway between position 1 (CLOSED) and position 2 (OPEN). Close gaps. can result in much larger with hydraulic pressure off defective. A longer time inches for inservice hauled actuators or 4.0 inches for new or over-1 minute, gap exceeds 2.0 actuators, actuator is surface. If, after System - A/T). If leading edge surfaces required for flaps and slats to extend from faired position; check time required for flaps and slats to retract from down to faired position (Ref Leading Edge Flap and Slat With hydraulic system B depressurized, measure gap between lower surface of operate slowly, check time flap trailing edge and adjacent wing skin lower  R/I). or 17-81-41, R/I). (Ref 27-81-31, ator (Ref 27-81-31, R/I actuator Replace leading edge flap or slat Replace leading edge flap actu-

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 27-81-00
 ALL  ú ú 01 Page 102 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Continuity between Standby drive shutoff valve
Replace leading pins B1 and B2 on
position lever moves to
edge standby drive leading edge
position 1 (CLOSED)
shutoff valve standby drive
relay K3 shutoff valve relay K3
　
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