When is the use of the downlock release button for landing gear retraction authorized?

The use of the downlock release button for landing gear retraction is authorized during takeoffs when obstacle clearance is required. This procedure is specifically designed for situations where the aircraft needs to minimize the amount of time the landing gear is extended due to the presence of obstacles in the intended takeoff path. It allows the pilot to retract the landing gear quickly to gain altitude and avoid potential hazards.

In regular operations such as normal landings or emergency landings, the downlock release button should not be used, as it could lead to unintended land gear retraction, compromising safety. Similarly, during maintenance checks, the equipment is typically not in flight and does not involve the need for gear retraction associated with takeoff scenarios. Thus, option B accurately reflects the situation where the use of the downlock release button is considered appropriate and safe in the operational context.