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What is the failure probability figure of a commercial aircraft?

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What is the failure probability figure of a commercial aircraft?

(a) 1×10^-4/hr

(b) 1×10^-6/hr

(c) 1×10^-11/hr

(d) 1×10^-20/hr

The question was asked by my college director while I was bunking the class.

The origin of the question is Redundancy and Failure Survival in FBW in section Fly by Wire Flight Control of Avionics

1 Answer

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Correct choice is (b) 1×10^-6/hr

Easiest explanation: The statistical level of safety currently being achieved with civil aircraft transport corresponds to a figure of around 1 × 10^-6/hour. This figure is derived from the total number of civil aircraft crashes occurring in a year from all causes divided by the total number of aircraft flying and their annual operating hours.

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