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Which of the following is correct? (a)Factor of safety is provided to improve safety of an aircraft

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Which of the following is correct?

(a) Factor of safety is provided to improve safety of an aircraft

(b) Lift is always same as weight

(c) Weight is never same as lift

(d) Thrust required is same as weight always

The question was posed to me during a job interview.

This interesting question is from Loads Categories in division Structures and Loads of Aircraft Design

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Correct choice is (a) Factor of safety is provided to improve safety of an aircraft

The best explanation: The factor of safety is used in order to increase safety of the aircraft. Lift is not always same as the aircraft weight. Weight will be same as the lift during cruise. Thrust required is not always same as the weight.

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