The following data give the times between successive failures of an aircraft air

ID: 2250447 • Letter: T

Question

The following data give the times between successive failures of an aircraft air-conditioning unit: 48,

29, 502, 12, 70, 21, 29, 386, 59, 27, 153, 26 and 326 hours. When a unit fails it is repaired in situ .

Repairs can be assumed to be instantaneous.

a Examine the distribution of failure times, treating the unit as a component on the aircraft.

b Examine the trend of failures, viewing the air- conditioning system itself as a repairable system.

c Describe clearly the conclusions to be drawn from both these analyses.

The answer of following question is as follows.

The distribution of failure time is cubic in nature.

The trend of failure is bilateral in nature.

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