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What if engines fail on takeoff?
If an aircraft suffered engine failure on takeoff, the standard procedure for most aircraft would be to abort the takeoff. If the engine failure occurs just after liftoff, the pilot must make a decision if there is enough runway to achieve an emergency runway landing, or if an off field landing is required.
What is a flex takeoff?
An assumed temperature takeoff (also known as “flex” on Airbus/Fokker aircraft) is where the engine thrust is reduced to match the performance on a higher-temperature day, up to either the maximum thrust reduction allowed or the maximum assumed temperature that meets takeoff distance requirements.
What happens when thrust is reduced for takeoff?
For airplanes fitted with engines that can be derated for takeoff, reduction of thrust will result in reduction in the amount of yaw effect. So, the amount of force required to counter that yaw can be generated at a lower speed. This results in V MCG reduction and the potential for reduction in V 1.
What’s the takeoff procedure for a Boeing 737?
Procedure. A rolling takeoff procedure is recommended for setting takeoff thrust as it expedites the takeoff (uses less runway length) and reduces the risk of foreign object damage or engine surge/stall due to a tailwind or crosswind. After thrust has reached 40%N1, wait for it to stabilise (roughly 2-3 seconds).
How does the thrust control work on a 737?
An electrically operated “balk” blocks each lever at the reverse-idle position until the thrust reversers deploy. Then each balk is removed to allow selection of full-reverse thrust. This electrically operated balk replaces the thrust control cable interlock used on previous 737s.
When to use thrust limit in alternate mode?
When in alternate mode, thrust can exceed the certified engine rating at forward thrust-lever positions. To avoid overboost, flight crews should use the flight management computercalculated thrust limit to set thrust for the current flight mode (takeoff, climb, or cruise).