What is an emergency extension?

• A. A system that quickly retracts the landing gear during emergencies.
• B. A manual override for engine start.
• C. Primarily a free fall aided by stored energy in the MLG shock absorber and hydraulic system no. 2B pressure.
• D. A feature that deploys the arresting hook automatically.

Answer: (C)

An emergency extension is a backup method to put the landing gear down and locked when normal hydraulic power isn’t available. In this mode, the system uses stored energy in the main landing gear shock absorber and the second hydraulic system (2B) to drive the gear down, with gravity helping the motion. This is why it’s described as a free-fall aided by that stored energy—no active hydraulic pressurization is required for deployment. The goal is to ensure the aircraft can still achieve a safe, locked gear configuration for landing even if the primary gear-extension system has failed.

This concept doesn’t involve retracting the gear, isn’t about an engine-start override, and isn’t about automatically deploying the arresting hook, which is why those options don’t fit.