Critical Structure – A load bearing structure/element whose integrity is essential in maintaining the overall flight safety of the aircraft. Note that there are differences in the definitions of primary structure, secondary structure, and principle structural elements (PSE) when considering the different categories of aircraft. For example, PSE’s (principle structural elements) are critical structures for Transport Category Aircraft.
This definition is important in determining whether a repair or alteration is considered either Major or Minor. If a item of structure is considered “critical”, “primary” or a “PSE” the repair of that item would be considered Major thus neccesitating the use of Approved repair data.
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