Definition
On a constant-speed propeller system, a full cycle is the complete movement of the propeller blades from their lowest pitch (high rpm) setting to their highest pitch (low rpm) setting and back again, accomplished by moving the propeller control through its full range during runup to verify the governor and pitch-change mechanism are working correctly.
Plain English
It is the act of moving the propeller control all the way out and all the way back in during the engine runup, so the blades change angle through their full travel and you can confirm the system is working before flight.
Context Anchor
Used during the before-takeoff engine check for an airplane with a constant-speed propeller.
Derivation
Cycle comes from an old word meaning “circle” or “wheel.” In aviation use here, it means a complete action that returns to where it started: back, then forward again.
Why Pilots Care
Verifies that the propeller governor and pitch-change mechanism are operating correctly before flight.
Intuition Check
Do not read “full cycle” as running the engine through every power setting. Here it means one complete back-and-forward movement of the propeller control during the propeller check.
Example Sentence 1
During runup, the pilot exercised the propeller through a full cycle to circulate warm oil and verify governor operation.
Example Sentence 2
After an oil change the mechanic cycled the propeller through a full cycle to bleed air from the system.