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A.  The leading edge flap and slat position indicator provides an indication of normal flap and slat operation (Fig. 1). The position indicator is located on the pilots' center instrument panel and consists of an amber LE FLAPS TRANSIT light, a green LE FLAPS EXT light. Each light includes a fuse and a press-to-test switch. The indicators receive 28-volt dc power from the airplane lighting system. Individual lamp circuits are completed in the transistorized control circuitry in the module.
5  Leading Edge Devices Annunciator Panel
A.  The leading edge devices annunciator panel indicates the position of each leading edge flap and slat by means of transit and position indicator lights (Fig. 1). The annunciator panel is mounted in the aft overhead panel and includes a test switch. The annunciator panel also contains a transformer and a full-wave rectifier. The transformer primary receives power from the 28-volt ac transfer bus. Transformer output is delivered to the indicator lamps. The individual lamp circuits from any set of indicators are completed in the applicable logic card in the module.
6.  Operation
A.  The position of the leading edge flaps and slats is displayed on two indicator light panels (Fig. 1). Indication of flap and slat system operation is shown by indicator lights on the center instrument panel. If these lights do not indicate the anticipated condition, an annunciator on the aft overhead panel will indicate the discrepent flap or slat. When the leading edge devices are retracted, none of the indicator lights on either panel are illuminated.
B.  When the trailing edge flaps are extended to 1 unit, the leading edge flaps are fully extended, and leading edge slats 1 thru 6 are in the intermediate position. As each flap leaves the retracted position, an actuation bar mounted on the flap hinge moves away from the retract proximity sensor coil (sensor). As each slat leaves the retracted position, the reed switch in the actuator closes. The resultant changes in current flow are sensed by transistorized switch cards in the position indication module. The switches then operate to complete logic card circuits which control annunciator panel indicators and flap and slat position indicators on the center instrument panel (Fig. 2). This illuminates the LE FLAPS TRANSIT indicator on the center panel and the 10 FLAPS and SLATS TRANSIT indicators on the annunciator panel. When the flaps reach the extended position, and slats 1 thru 6 reach the Intermediate position, actuation bars are adjacent to the flap extend sensors on each slat. This extinguishes all transit indicator lights and illuminates the LE FLAPS EXT indicator on the center instrument panel, and the FLAPS FULL EXT, and SLATS 1 through 6 EXT indicators on the annunciator panel. If any flap or slat does not reach the selected position, the LE FLAPS EXT indicator on the center panel will not illuminate and the LE FLAP TRANSIT indicator will remain lighted. On the annunciator panel, the transit indicator will remain illuminated for the flap or slat not reaching the selected position. The full extend indicator will illuminate for the flaps reaching the selected position. The extend indicator will illuminate for the slats reaching the selected position.
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Feb 01/96  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-88-0 Page 5 

C.  When trailing edge flaps are extended to 10 units, 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 extinguishes the LE FLAPS EXT indicator and illuminates the LE FLAPS TRANSIT indicator on the center instrument panel. At the same time, the SLATS EXT indicators on the annunciator panel extinguish and the SLATS TRANSIT indicators illuminate. The FLAPS FULL EXT indicators on the annunciator panel remain illuminated. 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 extinguished and the LE FLAPS EXT indicator is illuminated. Simultaneously, the SLATS TRANSIT indicators on the annunciator panel are extinguished and the SLATS FULL EXT indicators are illuminated. 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.
D.  When the trailing edge flaps are extended 10 units or more, the leading edge flaps and slats remain fully extended.
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G43016
531  Leading Edge Flap and Slat Position Indicating Circuit 
May 15/71  Figure 2  27-88-0 
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