Airworthiness is the condition of an aircraft conforming to its approved design and being in a state for safe flight — with all required maintenance done, ADs complied with and defects handled per the MEL. Legally, an aircraft is airworthy or it does not fly.
Airworthiness is the condition in which an aircraft conforms to its approved type design and is in a state for safe operation: all required maintenance performed, ADs complied with, defects rectified or properly deferred, required documents and certificates valid. It is a binary legal state — an aircraft is airworthy, or it does not fly.
The system distinguishes initial airworthiness (the certification that a design and each manufactured aircraft meet the standards, expressed in the Certificate of Airworthiness) from continuing airworthiness (keeping each aircraft in that condition through its life — the world of maintenance programmes, CAMOs, ARCs and records). Day to day, a training aircraft's airworthiness is asserted at dispatch through the tech log's maintenance statement and the pilot's pre-flight determination.
Why it matters for flight schools
Every operational decision in a flight school ultimately hangs on this state: the PIC is legally required to determine the aircraft is airworthy before flight, and the organisation is required to make that determinable — current maintenance status, visible deferrals, valid ARC. The gap that hurts schools is informational, not mechanical: the aircraft was fine, but nobody at dispatch could actually demonstrate it from the records at hand. Airworthiness you cannot show is, for audit purposes, airworthiness you do not have.
How FlightLogger handles it
FlightLogger and FL Maintenance make the airworthiness state explicit at the moment it matters: dispatch shows each aircraft's live status — maintenance margin, open deferrals, document validity — so the legal determination rests on data, not assumption.
Frequently asked questions
Who is responsible for an aircraft's airworthiness?
Responsibility is layered: the owner/operator (or contracted CAMO) for continuing airworthiness management, the maintenance organisation for correctly performed and released work, and the pilot in command for determining the aircraft is airworthy before each flight.
What makes an aircraft legally unairworthy?
Any unmet mandatory requirement: overdue inspection or AD, an unassessed or expired deferred defect, an invalid ARC or CofA, or non-conformity with the approved type design. Physical condition and legal status must both be satisfied.