27-88-00
 ALL  ú ú 01 Page 9 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F44884
 C.

D.
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A
737-300/400/500MAINTENANCE MANUAL
When trailing edge flaps are extended to 10 units or more, all leading edge slats fully extend. As the slats move from the intermediate position, actuation bars move away from the intermediate position sensors on each slat. This turns off the LE FLAPS EXT indicator and turns on the LE FLAPS TRANSIT indicator on the center instrument panel. At the same time, the SLATS EXT indicators on the annunciator panel go off and the SLATS TRANSIT indicators come on. The FLAPS FULL EXT indicators on the annunciator panel remain on. When the slats are fully extended, actuation bars are adjacent to the full extend position sensors on each slat. In this slat position, the LE FLAPS TRANSIT indicator on the center panel is off and the LE FLAPS EXT indicator is on. Simultaneously, the SLATS TRANSIT indicators on the annunciator panel are off and the SLATS FULL EXT indicators are on. If either slat does not reach the fully extended position, the indicator on the center panel will continue to show the in-transit condition and the malfunctioning slat will be located on the annunciator panel.When the trailing edge flaps are extended 10 units or more, the leading edge flaps and slats remain fully extended.When the trailing edge flaps are retracted to between 10 and 5 units, slats will be retracted to the intermediate position. As the slats retract, the center instrument panel and annunciator panel full extend indicators will be off and the transit indicators will be on. When the slats reach the intermediate position, the transmit indicators on both panels will be off and the LE FLAPS EXT indicator on the center panel and SLATS EXT indicators on the annunciator panel will be on.When the trailing edge flaps are retracted to the UP position, the leading edge flaps and slats are fully retracted. As the slats and flaps retract, the extend indicators will be off and the transit indicators on the center instrument panel and annunciator panel will be on. When the flaps and slats reach the retracted position, all indicator lights are off.
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 27-88-00
 ALL  ú ú 01 Page 10 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 LEADING EDGE FLAP AND SLAT POSITION INDICATING SYSTEM - TROUBLE SHOOTING
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 1.  General_______
 A.  Green and amber leading edge position indicating lights are provided on the center instrument panel and leading edge flap and slat position annunciator panel to indicate position of the leading edge devices. One amber and one green indicator light on the center instrument panel indicate collective position of all leading edge flaps and slats. The position annunciator panel has one amber and one or two green annunciator lights for each flap and slat.
 B.  The amber indicator and annunciator lights indicate that the applicable flap or slat is in transit. The green lights indicate that the flap or slat is extended. No light illuminated indicates that the flap or slat is retracted.
 C.  The green EXT annunciator light indicates that the leading edge flaps are fully extended and slats are in intermediate (mid) extend position. The green FULL EXT light indicates that the slats are in full extend position.
 (1)  
Leading edge flaps extend fully when trailing edge flaps are extended to 1-unit or more.

 (2)  
Leading edge slats extend to intermediate position when trailing edge flaps are at 1 to 5 units, and fully extend when trailing edge flaps are extended to 10 units or more.

 D.  
This trouble shooting procedure assumes that electrical wiring, indicator lights on center instrument panel and annunciator lights on position annunciator panel are good. Placing the master dim and test switch in TEST position will confirm the indicator lights. Pressing the TEST switch on the position indication module will confirm the annunciator lights. If the trouble shooting procedures do not isolate the trouble, a further check of the wiring will be required.

 E.  
Troubleshooting for Leading Edge Flap and Slat Position Module (FSIM) is included in this procedure.

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