Definition
A type of jet engine thrust reverser that uses two curved, hinged doors located at the rear of the engine. When activated, the doors swing closed across the exhaust path and redirect the engine's exhaust gases forward, producing a braking force that helps slow the aircraft after landing.
Plain English
A pair of shells at the back of a jet engine that can close over the exhaust and bounce the thrust forward instead of backward, helping the airplane stop on the runway.
Context Anchor
Seen in jet aircraft engine systems, especially during landing rollout and other approved ground operations where reverse thrust may be used.
Derivation
Named after a clamshell because the two curved doors hinge open and shut like the two halves of a clam's shell. This shape is what gives the system its mechanical action and its name.
Why Pilots Care
It provides additional deceleration force after touchdown, shortening the landing distance and reducing brake wear on jet aircraft.
Intuition Check
Do not picture the whole engine turning around. In a clamshell thrust reverser, doors inside the exhaust path move to redirect the exhaust forward.
Example Sentence 1
After touchdown, the pilot selected reverse thrust and the clamshell thrust reverser doors swung closed to redirect the exhaust forward.
Example Sentence 2
During the preflight walk-around the crew confirmed that both clamshell thrust reverser doors were fully stowed and latched.