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Two aircraft concepts have to be compared regarding their reliability. Concept 1
contains four identical engines, two on the left and two on the right wing. The
concept fails if at least two engines fail on one wing. Concept 2 contains three
engines, one main engine at the center and one engine both on the left and on the
right wing.
(a) Visualize the reliability paths for both concepts using series and/or parallel
systems.
(b) Compare the concept reliabilities if all engines have equal failure probability p.
(c) Which engine reliability is required in both concepts to provide a system reliability of 0:9999? Which concept should be preferred?