Activation of the DN LOCK RLS button during takeoff is permitted only when it is required for obstacle clearance. Which statement best describes this constraint?

• A. It is required for obstacle clearance
• B. It is required for taxi clearance
• C. It is required for engine start
• D. It is required for landing

Answer: (A)

The essence here is that this downlock release is a controlled contingency action. Releasing the downlock during takeoff is not routine; it’s allowed only if there is a need to meet obstacle clearance. Keeping the gear down and locked during the early takeoff climb helps maintain safe clearance from obstacles and ensures stable handling and braking margins until it’s safe to retract the gear. Only when an obstacle dictates that retraction or a different gear state is required do you use this switch.

So the best description is that it is permitted only when obstacle clearance requires it. It isn’t about taxi clearance, engine start, or landing—those phases don’t justify activating this release during takeoff.