What is the maximum reverse thrust duration?

What is the maximum reverse thrust duration?

• A. 3 mins
• B. 5 mins
• C. 7 mins
• D. No limit

Answer: (B)

Five minutes. This limit exists to protect the engine and thrust reverser system from overheating and excessive wear during landing deceleration. Prolonged reverse thrust keeps the hot exhaust stream and mechanical components under high load, which can stress the reverser, nacelle, and engine cores. The time cap ensures you can still rely on other braking methods (wheel brakes, idle thrust) to finish deceleration without risking damage. Shorter times would still be safe but aren’t the published limit, while longer times would exceed approved safety margins.

Five minutes. This limit exists to protect the engine and thrust reverser system from overheating and excessive wear during landing deceleration. Prolonged reverse thrust keeps the hot exhaust stream and mechanical components under high load, which can stress the reverser, nacelle, and engine cores. The time cap ensures you can still rely on other braking methods (wheel brakes, idle thrust) to finish deceleration without risking damage. Shorter times would still be safe but aren’t the published limit, while longer times would exceed approved safety margins.