APR power on a single engine is limited to how many minutes?

• A. 5 minutes
• B. 10 minutes
• C. 15 minutes
• D. 20 minutes

Answer: (B)

APR power on a single engine is limited to ten minutes. This temporary boost provides enough performance to reach a safe landing after an engine failure, while protecting the operating engine from overheating and excessive stress. Use this window to get to the nearest suitable airstrip or to set up the planned approach, then revert to normal operation and secure the failed engine as procedures dictate. The time limit isn’t meant for extended use; exceeding it could risk engine damage, so the goal is to get to safety within those ten minutes.