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Published online by Cambridge University Press: 04 July 2016
Any system for controlling the airworthiness of aircraft engines in service should meet the following conditions:
(a) it should be such that the incidence of in-flight shut-downs is kept to an acceptably low level;
(b) it should ensure that aircraft are not flown with engines delivering significantly lower power than that used in establishing the scheduled Flight Manual performance; and
(c) it should provide maximum protection against failures of a potentially catastrophic nature, regardless of probable incident rate.
In this paper, the foregoing principles are discussed in relation to experience with turbine engines in transport aircraft. Particular emphasis is placed on the importance of monitoring, by which is meant any procedure or device that can be used to determine engine condition in flight or on the ground. Some current trends in turbine engine overhaul policies are also reviewed briefly.