Which of the graphs correctly illustrates how the "thrust available" curve of a twin-engined aeroplane changes when it suffers an engine failure?
Refer to figure.
Provided that both engines produce the same amount of thrust (which is usually the case), the thrust available will be reduced by 50% after an engine failure on a twin engined aeroplane.
This would cause the thrust available curve to move straight downwards. The question figure does not depict it 100% accurately, as each point on the curve would be reduced to half of it's value on the Y-axis, but figure A is the best depiction by far, and the only one that could be considered correct.
Figure C is incorrect as the IAS (Indicated Airspeed) of the points on the curve would not change. The operative engine is still providing the same thrust at each airspeed that it always has, so no lateral movement of the curve would occur.
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