Use when you must evaluate airworthiness directive compliance: test each aircraft in an operator fleet against the directive effectivity by affected model and serial range, compute the remaining compliance margin in the directive's own basis (flight cycles, flight hours, or calendar months from the effective date), classify each aircraft as open, due, or overdue against the directive grace band, and roll up the per-directive fleet compliance report with applicable, open, due and overdue counts and the strict compliance rate.
