What procedure ensures the proper functioning of the landing gear?

The drop check is a crucial procedure for verifying the proper functioning of the landing gear system. This involves allowing the landing gear to extend and retract under controlled conditions to ensure that it operates as expected. During this check, technicians observe the gear’s deployment and confirm that it locks securely in place, both in the extended and retracted positions. This procedure is essential because landing gear is one of the critical components for aircraft safety during takeoff and landing phases. A successful drop check indicates that the mechanism is working smoothly, preventing potential issues during actual flight operations.

While the other options may involve checks or inspections of various components and systems, they do not specifically focus on the functional and operational readiness of the landing gear in the same direct manner that a drop check does. For instance, an operational check may determine if systems are active and functioning, but it does not necessarily verify the complete and correct maneuvering of the landing gear itself. Thus, the drop check is the procedure most directly responsible for assuring that the landing gear mechanics operate correctly when needed.