737-300/400/500
MAINTENANCE MANUAL

RAM AIR BAY
SEE G
TO LE SLAT
AUTOSLAT
ACTUATORS
VALVE
(FULL EXTEND)
RETURN TO RESERVOIR 
FROM LEADING EDGE FLAP AND SLAT CONTROL VALVE (FULL EXTEND) 
FROM LEADING EDGE FLAP AND SLAT CONTROL VALVE (INTERMEDIATE EXTEND)  NO. 1 SOLENOID 
NO. 2 SOLENOID 
G  FWD 
Figure 1 (Sheet 3) Leading Edge Autoslat System - Component Location 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STALL MANAGEMENT ú

 27-83-00
 COMPUTER P/N 65-52822  ú  CONFIG  2
 ú  01  Page 4
 ú  Mar 15/90 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 3.

4.

5.

A
737-300/400/500MAINTENANCE MANUAL
 (3) E-11 Landing Gear Logic ShelfAutoslat Flight Deck Indication (Fig. 1)
_______________________________
 A.  Autoslat operation modifies the usual function of the LE FLAPS EXT and LE FLAPS TRANSIT indicator lights on the P2 center instrument panel. When the autoslats are not in operation, the LE FLAPS TRANSIT light comes on and the LE FLAPS EXT light goes off while the leading edge devices are extending or retracting. The LE FLAPS TRANSIT light indicates that the LE devices are not in the position corresponding to the TE devices. During an autoslat extension in the air, the stall management computer keeps the LE FLAPS TRANSIT light off and allows the LE FLAPS EXT light to remain on.
 B.  An amber AUTO SLAT FAIL light in the flight control module on the P5 overhead panel provides failure annunciation for the autoslat system. A fault signal that both stall management computers are disabled will immediately turn on the AUTO SLAT FAIL light, and will also turn on the FLT CONT and MASTER CAUTION lights on the P7 glareshield panel. Pressing the master caution reset will turn off the FLT CONT and MASTER CAUTION lights, but the AUTOSLAT FAIL light will remain on to indicate that the autoslat system is not functional.
 C.  A fault signal that one stall management computer is disabled will turn on the AUTOSLAT FAIL light only when the master caution recall button is pressed. The AUTOSLAT FAIL light can then be turned off by pressing the master caution reset button.
Autoslat Valve (Fig. 1)
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 A.  The autoslat valve ports pressure to fully extend the LE slats when it is activated by either SMC. The valve is located in the the aft end of the right ram air duct bay. It is accessed for servicing through the right underwing fairing access panel.
 B.  The autoslat valve is normally closed and does not affect the operation of the leading edge slats. The valve has two control solenoids, one activated by SMC 1 and the other activated by SMC 2. If either or both solenoids are activated, hydraulic pressure is ported from the intermediate extend hydraulic line to the full extend side of the slat actuators. This moves the slats to the full extend position if they were at the intermediate extend position. When the solenoid is deactivated, a spring returns the valve to its closed position.
 C.  The autoslat valve has two stages. Either solenoid opens a first stage valve. The first stage valve ports hydraulic pressure to open a second stage valve. The second stage valve then ports the intermediate extend pressure to the full extend side of the slat actuators.
Operation (Fig. 2)
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 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STALL MANAGEMENT ú

 27-83-00
 COMPUTER P/N 65-52822  ú CONFIG 2 ú 01 Page 5 ú Mar 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

LE DEVICES TO LE SLAT
SMC 2 SIMILAR CONTROL VALVE ACTUATORS
Leading Edge Autoslat System Schematic Figure 2
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