B737 Leading Edge Devices Annunciator Panel

LE DEVICES Annunciator Panel

  • Indicates the position of individual LE flaps and slats.
  • Extinguished: Related LE device retracted.
LE Annunciator Panel
P5 AFT OVERHEAD

Leading Edge Devices TRANSIT Lights

  • Illuminated (amber): Related LE device in transit.

Leading Edge Devices Extended (EXT) Lights

  • Illuminated (green): Related LE slat in extended (intermediate) position.

Leading Edge Devices Full Extended (FULL EXT) Lights

  • Illuminated (green): Related LE device fully extended.

Leading Edge Annunciator Panel TEST Switch

  • Press: Tests all annunciator panel lights.

Indications on ENGINE DISPLAY

Leading Edge Flaps (LE FLAPS TRANSIT) Light

  • Illuminated (amber):
    • Any LE device in transit.
    • Any LE device not in programmed position with respect to TE flaps.
    • A LE uncommanded motion condition exists (two or more LE flaps or slats have moved away from their commanded position).
    • During alternate flap extension until LE devices are fully extended and TE flaps reach flaps 15.
  • Note: Light is inhibited during autoslat operation in flight.
  • Note: Light is inhibited when trailing edge flap position is provided by SMYDs.

Leading Edge Flaps Extended (LE FLAPS EXT) Light

  • Illuminated (green):
    • All LE flaps extended and all LE slats in extended (intermediate) position (TE flap positions 1, 2, 5, 10, 15, and 25).
    • All LE devices fully extended (TE flap positions 30 and 40).
  • Note: Light is inhibited when trailing edge flap position is provided by SMYDs.