Definition
A device fitted to an aircraft engine's exhaust system that reduces the noise produced by exhaust gases as they leave the engine. It works by slowing the gases, breaking up the pressure pulses, and absorbing or redirecting sound energy before it reaches the surrounding air.
Plain English
A part attached to the engine's exhaust that makes it quieter, similar in idea to a muffler on a car.
Context Anchor
Seen in powerplant and exhaust-system maintenance discussions, especially when inspecting or replacing exhaust parts.
Derivation
From 'sound' (what you hear) and 'suppressor', from Latin 'supprimere' meaning 'to press down' or 'hold back'. So literally a device that holds back sound — a fitting name for what it does.
Why Pilots Care
It helps the aircraft meet FAA noise certification standards and reduces disturbance to people on the ground.
Analogy
It works much like a car muffler: the engine still makes noise, but the exhaust sound is reduced before it reaches the outside air.
Intuition Check
Do not read “suppressor” as “silencer.” A sound suppressor reduces exhaust noise; it does not make the engine quiet or noise-free.
Example Sentence 1
During the inspection, the technician checked the sound suppressor for cracks and loose mounting hardware.
Example Sentence 2
A properly functioning sound suppressor keeps the aircraft within airport noise limits during takeoff.