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When using the pressurized nitrogen bottle system for emergency landing gear extension…

  • A
    The emergency system is automatically activated upon failure of the main system, allowing a one-shot extension of the landing gear.
  • B
    The emergency system is automatically activated upon failure of the main system and can be used several times.
  • C
    The emergency system is activated manually by pulling a handle in the cockpit, allowing a one-shot extension.
  • D
    The emergency system is activated manually by pulling a handle in the cockpit, allowing the system to be used several times.

Refer to figure.
EMERGENCY GEAR EXTENSION

When you establish that the gear has failed to extend, you should be ready to use whatever type of emergency landing gear system is available in the aeroplane. The most common kinds you will see are the hand crank, hand pump hydraulic, free fall and pressurized nitrogen bottle systems. These systems are designed for emergency gear extension - not retraction. Failure of gear to retract is not an emergency unless it retracts partially and cannot be extended again
  • In the pressurized nitrogen bottle system, the emergency gear extension system is activated by pulling the red EMER GEAR CONTROL handle, allowing a one shot extension of the landing gear. Once activated, nitrogen pressure from the emergency air bottle is released through a shuttle valve to the extend side of the landing gear actuators, extending the gear towards the down and locked position.
    Once the gear has fully extended, the down locks inside the actuators will engage and the down and locked micro switches will be energised causing the three green down and locked lights to illuminate. Once the emergency gear extension procedure has been used, subsequent retraction of the landing gear cannot be achieved. Ground servicing of the system is required prior to normal use of the system.

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