What is the maximum deploy and stow cycle time for thrust reversers?

What is the maximum deploy and stow cycle time for thrust reversers?

• A. Two seconds or less
• B. One second
• C. Three seconds
• D. Five seconds

Answer: (A)

Thrust reverser response time is a safety-related performance spec that governs how quickly the system can move from stowed to deployed and back again. The idea is to ensure rapid, predictable reversal of thrust so braking is effective and control is maintained during the landing roll or after an aborted takeoff. The required upper limit is two seconds for the entire deploy-and-stow cycle, meaning the system must complete the sequence within two seconds or less. This provides a reliable, practical bound that accounts for the actuation and mechanical dynamics involved, while still allowing for minor variations in conditions. Choosing a claim like one second would be more restrictive than necessary, though achievable, while longer times such as three or five seconds would exceed the established maximum and would not meet safety certification criteria.

Thrust reverser response time is a safety-related performance spec that governs how quickly the system can move from stowed to deployed and back again. The idea is to ensure rapid, predictable reversal of thrust so braking is effective and control is maintained during the landing roll or after an aborted takeoff. The required upper limit is two seconds for the entire deploy-and-stow cycle, meaning the system must complete the sequence within two seconds or less. This provides a reliable, practical bound that accounts for the actuation and mechanical dynamics involved, while still allowing for minor variations in conditions. Choosing a claim like one second would be more restrictive than necessary, though achievable, while longer times such as three or five seconds would exceed the established maximum and would not meet safety certification criteria.