Definition
The highest reverse thrust setting available from a turbopropeller engine, achieved by moving the power lever fully aft of the beta range into the reverse range, which commands the largest negative propeller blade angle and the highest engine power permitted in reverse. It produces the strongest rearward thrust the system can deliver and is used to maximize deceleration during the landing rollout.
Plain English
It is the strongest braking push the propeller can give you on the ground, made by pulling the power lever as far back as it will go after landing.
Context Anchor
Used during landing rollout, rejected takeoff, and reverse-thrust training, especially when the pilot needs extra stopping help on the runway.
Derivation
Maximum' comes from Latin maximus meaning 'greatest.' 'Reverse' comes from Latin reversus, 'turned back.' Together the term simply names the greatest amount of turned-back thrust the propeller can produce.
Why Pilots Care
Selecting maximum reverse shortens landing distance and reduces brake wear, but requires careful handling to maintain directional control and avoid engine stress.
Intuition Check
Maximum reverse does not mean the airplane is meant to back up, and on propeller airplanes it does not mean the propeller spins backward. It means the system is set to create the strongest approved braking force after the airplane is on the runway.
Example Sentence 1
After touchdown on the short runway, the pilot lifted the power levers over the gate and selected maximum reverse to slow the airplane quickly.
Example Sentence 2
In a strong crosswind the crew used less than maximum reverse to keep the airplane straight on the runway.