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Which of the following is not a common mode failure?

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in Avionics by (87.1k points)
Which of the following is not a common mode failure?

(a) Lightning strike

(b) Fire/explosion/battle damage

(c) Bird strike

(d) Incorrect maintenance

This question was addressed to me in an internship interview.

My question is from Redundancy and Failure Survival in FBW in chapter Fly by Wire Flight Control of Avionics

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Best answer
The correct answer is (c) Bird strike

The best explanation: The type of failure which can affect all systems at the same time is termed a Common Mode Failure. Examples of common mode failures are the Lightning strike, Electro-magnetic interference, Fire/explosion/battle damage, Incorrect maintenance, Common design errors – e.g., software.

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