What this relates to
The flight control system is used to control the aircraft about its three axes and includes the various control surfaces and their control mechanisms; for helicopters, these are primarily the main and tail rotor controls.
Example
An aircraft is making its landing approach with a flap position of 20 degrees. The crew selects a flap position of 30 degrees, but the flaps fail to move. The message MASTER CAUTION FLAPS FAIL comes on. The crew decides to abort the landing approach and apply the standard procedure for missed approaches. The procedure is performed, followed by a new approach and a trouble-free landing executed with a 20 degree flap position.
