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What is a Critical Engine
This engine would most adversely affect the performance of the airplane if it were to fail.
minimum controllable airspeed, minimum speed at which the aircraft is directionally controllable
Critical Engine Failed, Operating Engine Takeoff Power, Most Unfavorable Weight, Bank less than 5 degrees, Aft CG, Takeoff Configuration, Sea level conditions, Ground Effect, Gear Up
Critical Engine Failed Factors Affecting Airplane
Torque, P-Factor, Accelerated Slipstream, Spiraling Slipstream
Critical Engine Failed Torque Factor
Due to the direction of rotation of the props a yawing tendency occurs when the left engine fails, making it the critical engine
Critical Engine Failed P-factor
Operating right-hand engine will produce a more severe yaw towards the dead engine due to the direction of rotation of the props. More "bite" from downward blade which is further from the center of the aircraft.
Critical Engine Accelerated Slip Stream
Due to accelerated air over the wing it causes greater lift and a rolling tendency.
Critical Engine Spiraling Slipstream
Left Engine Critical, The airflow from the left engine is moving around the aircraft and pushing on the rudder causing a yaw to the left. Right engine has no effect.
Most Unfavorable Weight Factor
Light is unfavorable. An increase in weight causes Vmc to decrease because of the greater horizontal component of lift. With a greater horizontal component of lift (max 5 degrees) less rudder is required thus decreasing Vmc.
Critical Engine Factor Bank up to 5 Degrees
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