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 1.  General_______
 A.  High lift leading edge devices are used in combination with the trailing edge flaps to allow airplane operation from short runways. The use of leading edge devices allows a change in wing camber which greatly increases lift. The leading edge lift devices consist of four Krueger flaps and six slats (Fig. 1).
 B.  Three leading edge slats are installed outboard of the engine and two leading edge flaps are installed inboard of the engine on each wing. The slats and flaps are numbered from left to right as shown in Fig. 1. Leading edge slats 1 thru 6 are actuated by a three-position hydraulic actuator. If hydraulic pressure is low, a blocking valve will create a hydraulic lock to prevent actuator movement. This locking action will hold the slat in the position at which the loss of hydraulic pressure occurs. Each leading edge flap is actuated by a two-position hydraulic actuator. The flap actuator will also lock in position if hydraulic pressure is low. Locking the acutators prevents blowback of the flaps and slats if hydraulic pressure is lost during takeoff or landing. Restrictors installed in the flap and slat actuator hydraulic pressure lines limit the actuating speed of the leading edge devices.
 C.  The leading edge flaps and slats are normally powered by hydraulic system
 B. A three-position spool-type control valve is operated by the flap control unit. The control valve ports hydraulic fluid to the leading edge flap and slat actuators. When the trailing edge flaps are between 1 and 5 units, the control valve ports pressure to fully extend the leading edge flaps and extend all leading edge slats to the intermediate position. When the trailing edge flaps are positioned to 10 units or more, the control valve ports pressure to fully extend all leading edge slats.
 D.  On flap retraction, all leading edge flaps and slats remain fully extended until the trailing edge flaps are retracted to less than 10-unit extension. Between 10 units and 5 units, all leading edge slats retract to intermediate positions, and all leading edge flaps remain fully extended. As the trailing edge flaps move from 1 unit to fully retracted position, all leading edge flaps and slats move to the fully retracted position. Control lever movement toward the UP detent is stopped momentarily at the 1-unit position by a gate on the flap control quadrant.
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 27-81-00
 ALL  ú ú 01 Page 1 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FLAP CONTROL LEVER

Leading Edge Flap and Slat Control System - Component Location
Figure 1 (Sheet 1)

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 27-81-00
 ALL  ú ú 01 Page 2 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
LEADING EDGE FLAP AND SLAT CONTROL VALVE
TRAILING EDGE FLAP CONTROL VALVE
FLAP 
CONTROL 
UNIT 
FWD  INBD 
A 
STANDBY RUDDER 
ACTUATOR SHUTOFF 
VALVE 
LEADING EDGE 
STANDBY DRIVE 
SHUTOFF VALVE 

WHEEL WELL AFT BULKHEAD
B
Leading Edge Flap and Slat Control System Component Location Figure 1 (Sheet 2)
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 27-81-00
 ALL  ú ú 01 Page 3 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
AUXILIARY SLAT TRACK
SLAT ACTUATOR 
DOOR 
SLAT MAIN TRACK 
LEADING EDGE SLAT 
AUXILIARY 
SLAT TRACK 
LEADING EDGE 
SLAT ACTUATOR  AUXILIARY 
SLAT TRACK 
THERMAL ANTI-ICE 
FWD  INBD  TELESCOPING DUCT 
C 

Leading Edge Flap and Slat Control System Component Location
　
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