Definition
A compliance category used in an Airworthiness Directive (AD) requiring that the corrective action specified in the AD be completed before the aircraft is flown again. The aircraft is not airworthy, and no further flight is permitted, until the AD requirement has been satisfied and properly recorded.
Plain English
The fix called out in the AD must be done before the next flight. The aircraft cannot be flown until it is taken care of and signed off.
Context Anchor
Seen in Airworthiness Directives when the FAA requires an aircraft problem to be handled before any more normal flying occurs.
Derivation
“Compliance” comes from an older meaning of “to fulfill” or “to carry out.” That fits the aviation use: the pilot or owner is not just aware of the directive; the required action has actually been carried out.
Why Pilots Care
It grounds the aircraft until the safety issue is resolved, directly affecting flight scheduling and regulatory compliance.
Analogy
It is like a safety notice on a machine that says, “Do not use again until this part is fixed.” The key point is not speed in general; it is that use stops until the required action is complete.
Intuition Check
Do not read “immediate” as “soon” or “when convenient.” Here it means before the aircraft’s next flight. Do not read “prior to further flight” as “before some later trip.” It means before any more flying, unless a specific limited exception is allowed.
Example Sentence 1
The new AD required immediate compliance prior to further flight, so the aircraft was grounded until the inspection was completed and logged.
Example Sentence 2
Because the directive stated immediate compliance prior to further flight, the owner cancelled the trip until the inspection was finished.