What is the correct sequence for manual gear extension on most transport-category aircraft?

What is the correct sequence for manual gear extension on most transport-category aircraft?

• A. Access the manual extension handle, apply mechanical force per manual, disengage locks, allow gear to extend and lock, verify position with indicators and door status
• B. Verify door status first, then pull handle, disengage locks, retract gear
• C. Cycle hydraulic pump; verify door status; then manually push wheel
• D. Turn off hydraulics; jettison gear doors; deploy gear automatically

Answer: (A)

When hydraulic control is lost, you must physically take control of the gear through the manual extension system. The process starts by locating the manual extension access and applying the force specified in the aircraft’s manual to operate the mechanism. This action unlocks the gear from its stowed position and allows it to begin extending under its own weight or spring force. Once the gear has extended, it must lock into place and the flight deck indicators, along with the gear doors, should confirm that the gear is down and properly seated. This sequence ensures the gear is moved and secured safely when normal hydraulic power cannot be used, and it provides clear confirmation that the aircraft is configured for landing. Other sequences don’t reflect how manual extension is designed to work. Cycling hydraulic pumps or pushing a wheel manually doesn’t achieve a true mechanical extension of the gear with proper locking. Verifying door status or attempting to deploy through non-manual means without first using the manual extension mechanism would not reliably achieve a safe, validated gear down and locked condition.

When hydraulic control is lost, you must physically take control of the gear through the manual extension system. The process starts by locating the manual extension access and applying the force specified in the aircraft’s manual to operate the mechanism. This action unlocks the gear from its stowed position and allows it to begin extending under its own weight or spring force. Once the gear has extended, it must lock into place and the flight deck indicators, along with the gear doors, should confirm that the gear is down and properly seated. This sequence ensures the gear is moved and secured safely when normal hydraulic power cannot be used, and it provides clear confirmation that the aircraft is configured for landing.

Other sequences don’t reflect how manual extension is designed to work. Cycling hydraulic pumps or pushing a wheel manually doesn’t achieve a true mechanical extension of the gear with proper locking. Verifying door status or attempting to deploy through non-manual means without first using the manual extension mechanism would not reliably achieve a safe, validated gear down and locked condition.