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4. The hydraulic systems in an aircraft have tree major modules. Two modules have a reliability of 098, and the third has a r

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Answer #1

4.

A.

Reliability of the hydraulic system = Reliability of module 1 *Reliability of module 2 *Reliability of module 3

Reliability of the hydraulic system = .98*.98*.99

Reliability of the hydraulic system = .9507 or .95

B.

when backup modules are added to each of the three modules with the same reliability,

Reliability of the system = (.98 + .98*(1-.98)) * (.98 + .98*(1-.98)) * (.99 + .99*(1-.99))

Reliability of the system = .9991 or 1

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