: an instrument that indicates to the pilot an aircraft's position relative to the ground.
What is a valve position indicator?
Valve position indicators are electrical switching devices that mount directly on a valve actuator, or indirectly on a transfer case. They are used in conjunction with a valve positioner.
What is the meaning of crash position?
To assume a brace or crash position is an instruction that can be given to prepare for a crash, such as on an aircraft; the instruction to 'Brace for impact!' or 'Brace! Brace!' is often given if the aircraft must make an emergency landing on land or water.