5.

6.

A
737-300/400/500MAINTENANCE MANUAL
 B.  The flap and slat position indication module with the built-in-test equipment (BITE) will help you with the trouble shooting, test the proximity sensor, and test the system configuration (Fig. 3).
Leading Edge Flap and Slat Position Indicator
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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 and 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.
Leading Edge Devices Annunciator Panel
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 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 individual lamp circuits from any set of indicators are completed in the applicable logic card in the module.
Operation
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 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 on.
 B.  When the trailing edge flaps are extended to between 1, 2, and 5 units, 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 turns on the LE FLAPS TRANSIT indicator on the center panel and the ten 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 turns off all transit indicator lights and turns on the LE FLAPS EXT indicator on the center instrument panel and the FLAPS FULL EXT, and SLATS 1 thru 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 come on and the LE FLAP TRANSIT indicator will remain lighted. On the annunciator panel, the transit indicator will remain on for the flap or slat not reaching the selected position. The full extend indicator will come on for the flaps reaching the selected position. The extend indicator will come on for the slats reaching the selected position.
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A 737-300/400/500MAINTENANCE MANUAL

PROXIMITY

PROXIMITY SENSORS
SENSORS
TYPICAL FOR SLATS 1 THRU 6 TYPICAL FOR FLAPS 1, 2, 3 ,4
Leading Edge Flap and Slat Position Indicating Circuit Figure 2

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A 737-300/400/500MAINTENANCE MANUAL

Flap/Slat Indication Module (FSIM) Menu Hierarchy
Figure 3

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