These procedures should be thorough enough to ensure that the system is free of leaks and the operational integrity of the system has been restored following maintenance.
Operational checks cover three distinct areas.
They are the operation of the landing gear and doors, the operation of the landing gear position indicator and warning system, and the operation of the landing gear emergency system. The first step in the drop check procedures is to place the aircraft on jacks. Refer to chapter 3 of this training manual. Further preparation includes connection of a hydraulic test stand and external electrical power, removal of landing gear maintenance safety locks, and the proper placement of the landing gear control handle. As the operational procedure begins, check to make sure that the landing gear doors do not close in the path of the retracting main struts.