Which lock is unlocked by the emergency extension?

• A. Landing gear up lock mechanisms.
• B. Landing gear down lock.
• C. Nose gear steering lock
• D. Tailhook lock

Answer: (A)

Emergency extension bypasses the normal hydraulic lock to let the gear move from the stowed position to the extended position. The key action is releasing the up lock that holds the gear up when retracted. Once the up lock is unlocked, the gear can descend into the extended, down position, where the down lock then secures it.

So, the function of emergency extension is to unlock the landing gear up lock, enabling deployment. The other locks shown (down lock, nose gear steering lock, tailhook lock) are not the ones released by this emergency process; they’re involved in other parts of gear behavior or different systems.