Definition
The redirection of engine exhaust or propeller airflow forward instead of rearward, producing a rearward force on the airplane to help slow it down after landing or during a rejected takeoff.
Plain English
Engine power is temporarily aimed forward instead of backward so it pushes the airplane to slow down rather than speed up.
Context Anchor
Pilots encounter thrust reversal during landing rollout procedures, stopped takeoffs, and aircraft operating limitations.
Derivation
Thrust comes from Old Norse 'thrysta', meaning to push or force. Reversal comes from Latin 'reversus', meaning turned back. Together: the pushing force is turned back the other way.
Why Pilots Care
Reduces landing distance and brake wear, especially useful on wet or contaminated runways.
Grounding Statement
The airplane is still moving forward, but part of the engine force is being used to help slow it down.
Intuition Check
Thrust reversal does not mean the engine runs backward. It means the thrust is redirected so it helps oppose the airplane’s forward motion.
Example Sentence 1
After touchdown, the pilot selected reverse thrust to help slow the airplane on the wet runway.
Example Sentence 2
On a short runway, thrust reversal helps the jet stop within the available distance.