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Over center mechanisms in landing gear systems are generally used to;
  • A
    Lock the landing gear in place
  • B
    Keep the landing gear doors closed
  • C
    Deflates the tyres automatically if the temperature rises too high
  • D
    Stops landing gear swaying

Refer to figure.

Undercarriage locks
A retractable undercarriage has to be locked when in the up (retracted) and down (extended) positions.

Types of lock
Over centre Lock
The over-centre lock or geometric lock is mainly used as a downlock. It will require a mechanical force to release the lock. The locks can be formed by using the stays bracing struts

Hook Lock
The hook lock will lock without hydraulic pressure but require hydraulic pressure to unlock. These type of locks are normally used as uplocks, but they can rarely be used as a downlock.

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