Definition
A component of the aircraft exhaust system, typically a metal shroud or chamber surrounding the exhaust pipes, that reduces engine exhaust noise and, in many light aircraft, also serves as the heat source for cabin heat and carburetor heat by transferring heat from the hot exhaust gases to outside air passing through or around it.
Plain English
A metal cover around the engine's exhaust pipes that quiets the noise and warms up outside air for cabin and carburetor heating.
Context Anchor
Seen in aircraft engine, exhaust system, preflight inspection, and cabin heat discussions.
Derivation
From the verb 'muffle,' meaning to wrap something up to deaden sound. The aviation muffler does the same job an automotive muffler does — wraps the noisy exhaust path to quiet it — with the added role of heating cabin and carburetor air.
Why Pilots Care
A damaged or clogged muffler can increase noise, affect back-pressure, and lead to performance loss or regulatory issues.
Intuition Check
A muffler does not plug or block the exhaust. It quiets the exhaust while still letting the gases flow out of the aircraft.
Example Sentence 1
During the preflight inspection, the pilot checked the muffler for cracks because any leak could allow carbon monoxide into the cabin heat.
Example Sentence 2
Mechanics replaced the aging muffler to restore proper engine sound levels and maintain exhaust flow.