1. Origins and development of the MSG-3 method

1.1 Origin

MSG-3 is the latest evolution in a process begun in 1930 by the Transport Airline Inspection Service, forerunner of the FAA, which specified that "all instruments and accessories must be disassembled at appropriate intervals". These practices then evolved around 1947, with the advent of "on-condition" maintenance and the collection of reliability data to implement the actuarial statistical method. Then, with the advent of jet-powered commercial aircraft and the impossibility of controlling the reliability of certain equipment, commercial aircraft manufacturers and operators were led to develop new maintenance concepts. By 1967, it was clear that accumulated knowledge had to be consolidated, and maintenance techniques developed, in order to :

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