Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Õhusõidukid
Kui rikete analüüs näitab, et osa peab säilitama eriti kõrge töökindluse taseme ja selle osa rikked esinevad ainult äärmiselt ebatõenäolisel juhul, siis seda õhusõiduki osa nimetatakse kriitiliseks.
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Where the failure analysis shows that a part must achieve and maintain a particularly high level of integrity if Hazardous Effects are not to occur at a rate in excess of Extremely Remote then such a part shall be identified as a Critical Part.
In addition to the requirement of point 21.A.804, each manufacturer of a part to be fitted on a type-certificated product which has been identified as a critical part shall permanently and legibly mark that part with a part number and a serial number.
