Which of the following is not an listed extension mode?

• A. Normal
• B. Electrical Override
• C. Alternate gear extension
• D. Manual Override

Answer: (D)

Extending the landing gear involves defined methods that the system can use to deploy the gear when the primary path isn’t available. Normal extension is the standard path that uses the primary hydraulics and controls. Electrical Override is a backup path that powers the extension from an alternate electrical source, still aiming to deploy the gear through the same general mechanism. Alternate Gear Extension is another built-in method that bypasses the failed portion of the system to get the gear down, often via a mechanical or hydraulic alternative.

Manual Override would imply a hands-on, manual method to release or extend the gear. While pilots or technicians might perform a manual release or hand crank in some aircraft, this is not typically listed as one of the formal extension modes in the system documentation. That’s why it’s the option that’s not considered an listed extension mode.