Definition
Toothed wheels designed to engage with the links of a chain, used to transmit rotational motion between shafts. In tailwheel and some light aircraft contexts, sprockets and chains are part of mechanical linkages such as those connecting steering or control systems.
Plain English
Wheels with teeth that grab the links of a chain, like the gears on a bicycle. They let one shaft turn another by pulling a chain along.
Context Anchor
Seen in discussions of airplane mechanical systems, especially linkages used for ground steering or control movement.
Derivation
From Middle English 'sprocket', originally meaning a projection or tooth on a wheel. The aviation use is the same as the bicycle and motorcycle use: a toothed wheel that drives a chain.
Why Pilots Care
Worn or misadjusted sprockets and chains can cause slack, slipping, or jammed control inputs, so they show up in preflight inspections and maintenance discussions for aircraft that use them.
Analogy
Think of a bicycle: the pedals turn a sprocket, which pulls the chain, which turns the rear sprocket. Aircraft sprockets work the same way, just driving a different system.
Intuition Check
A sprocket is not just any wheel. It is a toothed wheel made to grip a chain, belt, or similar part and move it.
Example Sentence 1
During the inspection, the mechanic checked the sprockets and chain for proper tension and signs of wear.
Example Sentence 2
The maintenance manual warned that worn sprockets in the trim system could cause binding or slippage during flight.