Normal takeoff power and maximum power (two engines) is limited to how many minutes?

Normal takeoff power and maximum power (two engines) is limited to how many minutes?

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

Answer: (A)

High-thrust takeoff settings on both engines are only allowed for a short, defined period. For the two-engine configuration on this aircraft, normal takeoff power and maximum takeoff thrust can be used for up to five minutes. This limit exists because sustained high-thrust operation generates extra heat and stress on the engines and related systems, so the checklist and performance data require you to back off to a lower thrust setting after that window to stay within safe limits. After five minutes you should reduce thrust to climb or normal cruise power to remain within the engine's allowed operating envelope. The other options would extend beyond what the engine and airframe are designed to tolerate for takeoff power.

High-thrust takeoff settings on both engines are only allowed for a short, defined period. For the two-engine configuration on this aircraft, normal takeoff power and maximum takeoff thrust can be used for up to five minutes. This limit exists because sustained high-thrust operation generates extra heat and stress on the engines and related systems, so the checklist and performance data require you to back off to a lower thrust setting after that window to stay within safe limits. After five minutes you should reduce thrust to climb or normal cruise power to remain within the engine's allowed operating envelope. The other options would extend beyond what the engine and airframe are designed to tolerate for takeoff power.