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Repair Classifications

Structural Repair Classifications:

(1) Category A.   A permanent repair for which the Baseline Zonal Inspection (BZI)  is adequate to ensure continued airworthiness (inspectability) equal to the unrepaired surrounding structure. The operator should demonstrate to the FAA that its maintenance or inspection program is at least as rigorous as the Baseline Zonal Inspection (BZI) .

(2) Category B.   A permanent repair that requires supplemental inspections to ensure continued airworthiness.

(3) Category C.   A temporary repair that will need to be reworked or replaced before an established time limit. Supplemental inspections may be necessary to ensure continued airworthiness before this limit.

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