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 27-81-00
 ALL  ú ú 01 Page 4 ú Jul 15/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
LEADING EDGE FLAP ACTUATOR
HINGE
LEADING EDGE FLAP
UPPER FLAP SPRING LINK ROD
KRUEGER
SEAL

INBD
LOWER FLAP NOSE ROD
D
FLAP NOSE
HINGE
SPRING
LEVER
SEAL
INBD CAM ROLLERLINK SEAL DOOR
E
Leading Edge Flap and Slat Control System Component Location Figure 1 (Sheet 4)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-81-00
 ALL  ú ú 01 Page 5 ú Jun 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 E.  A standby hydraulic system is provided to extend the leading edge flaps and slats in the event hydraulic system B fails. The system is controlled by the alternate trailing edge flap switches on the overhead panel. Actuating the switches automatically pressurizes the standby hydraulic system. Pressurized fluid from the standby system is directed to the flap and slat actuators by a motor-operated shutoff valve in the standby system modular package. Fluid flow to the actuators is regulated by a flow limiting valve and a hydraulic fuse.
 F.  An autoslat system is provided to automatically extend the leading edge slats from the intermediate position to the fully extended position at a predetermined angle of attack. The slats automatically retract to the intermediate position when the angle of attack is reduced (Ref 27-83-00).
 2.  Leading Edge Flaps__________________
 A.  Two Krueger-type leading edge flaps are installed on each wing. The flaps are numbered 1 thru 4 (Fig. 1). Each flap is a machined aluminum casting containing integral ribs and stiffeners. Flaps 1 and 4 each have three gooseneck hinges and flaps 2 and 3 each have five gooseneck hinges attached to fittings in the leading edge of the wing. A fitting is also provided on each flap for connecting the flap to a hydraulic actuator. A seal door and a hinged door are installed on the outboard end of flaps 1 and 4. The seal door and hinge door open to provide space for the thrust reverser to move aft. The seal door and hinge door are spring loaded and actuated by contact with the moving thrust reverser. A hinged tailgate is installed on the trailing edge of flaps 1 and 4 and two tailgates are installed on the trailing edge of flaps 2 and 3. A single linkage rotates the hinged tailgate as the leading edge flap 1 and 4 extend. Three linkages rotate the two hinged tailgates as the leading edge flaps 2 and 3 extend. Each linkage consists of two pushrods and a differential bar attached to a bracket on the flap casting. One pushrod extends from the tailgate to the differential bar and the other pushrod connects the bar to the fixed leading edge of the wing. When the leading edge flap retracts, the linkage folds the tailgate inward against the flap. When the leading edge flap extends, the tailgate also extends, allowing air to flow smoothly over the surface of the flap.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-81-00
 ALL  ú ú 01 Page 6 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3.  Leading Edge Slats
__________________
 A.  Three leading edge slats are installed on each wing outboard of the engine. The slats are numbered 1 thru 6 (Fig. 1). The slats consist of ribs attached to a beam, inner and outer clad aluminum skins, and a honeycomb trailing edge. A void between the inner and outer skins provides a path for thermal anti-icing. Anti-icing ducts installed in the slat leading edge connect with hot air supply lines through a telescoping tube. A three-position hydraulic actuator is attached at the center of all leading edge slats (1 thru 6). Each slat has two main tracks and two auxiliary tracks which ride on rollers in the wing leading edge. A third auxiliary track is installed at the outboard end of slats number 1 and 6. Structural stops are provided in both the extended and retracted slat positions. The downstops are attached to the slat tracks and contact with track guides in the extended position. The upstops consist of three adjustable plates which contact with the slat beam when the slats are retracted. All slats (1 thru 6) are stabilized at the intermediate position by a torsion rod and support arm assembly attached to the front spar between the auxiliary slat tracks. In the fully extended position, the number 1 and 6 slats do not extend as far as the other four slats.
　
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