Definition
A component in a turbine engine fuel control system that limits the rate at which fuel flow can increase when the throttle is advanced rapidly. It prevents the engine from receiving more fuel than it can burn cleanly during acceleration, which would otherwise cause compressor stall, overtemperature, or flameout.
Plain English
A device that stops the engine from being fed fuel too quickly when the pilot pushes the power lever forward fast. It smooths out the fuel increase so the engine can keep up.
Context Anchor
Seen in turbine engine fuel system descriptions, especially when studying how a jet or turboprop engine responds as power is increased.
Derivation
Acceleration comes from the Latin accelerare, meaning to hasten or speed up. In this context it refers specifically to the engine speeding up (increasing RPM), not the aircraft speeding up through the air. The unit controls how quickly that engine speed-up is allowed to happen.
Why Pilots Care
Without proper fuel scheduling, fast throttle movement can cause flameout, compressor stall, or turbine damage.
Analogy
It is like easing onto a car’s gas pedal instead of stomping on it. The goal is not just more power, but a smooth increase the engine can handle.
Intuition Check
Do not read this as a unit that makes the aircraft accelerate. It controls fuel during engine acceleration, meaning the engine speeding up after power is added.
Example Sentence 1
When the pilot rapidly advanced the power lever, the acceleration control unit metered the fuel increase to prevent a compressor stall.
Example Sentence 2
During the post-flight inspection the mechanic checked the acceleration control unit for proper operation after a reported slow spool-up.