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Gravity Gear Panel

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API Documentation: Gravity Gear Panel API

Description

The Gravity Gear Panel is used to control the gravity extension of the landing gear (L/G) on the A380.

Usage

L/G GRVTY sw

The L/G GRVTY panel has two switches that are linked together for simultaneous operation, and protected by a cover. However, if the link is removed, the switches can be used separately, for maintenance purposes only. Each switch controls one FFCM.

  • OFF POSITION:
    • When the L/G GRVTY sw is in the OFF position (normal position), the landing gear lever can be used for the normal extension/retraction of the L/G.
  • DOWN POSITION:
    • The extension of the landing gear by gravity is selected.
    • The L/G GRVTY sw remains in the DOWN position until the flight crew selects another position.
    • Note: Both switch-guards should be removed before the DOWN position is selected.

  • RESET POSITION:

    • After a gravity landing gear extension, the RESET position is selected to restore the LGERS in the normal configuration.
    • When the L/G GRVTY sw is in the RESET position:
      • The cut-out valves open
      • The retraction actuators switch from the gravity mode to the normal mode.
      • The L/G GRVTY sw should be back in the OFF position before the L/G lever can be used again to extend/retract the L/G.

    The L/G GRVTY sw can be reset either in flight or on ground.

    However:

    • A reset on ground of the L/G GRVTY sw must be performed only by maintenance as BLG doors will collide with forward BLG wheels when closing (a specific prior maintenance action is needed before reset)
    • A reset in flight must be restricted to training in absence of any gear system failure.

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