Defect deferral is the controlled postponement of a repair when the defect does not affect airworthiness or is permitted by the MEL, with a documented rectification deadline. Deferrals must stay visible to pilots and dispatch — invisible or expired deferrals are serious audit findings.
Defect deferral is the controlled postponement of rectifying a reported defect when doing so is permitted — because the item is covered by the MEL, because assessment shows it does not affect airworthiness, or because applicable rules allow deferral of specified minor items. A proper deferral records the assessment and its basis, sets a rectification deadline, applies any operational limitations, and keeps the item visible to crews and dispatch until closed.
Deferral is the legitimate middle path between 'fix everything immediately' (which grounds fleets over cosmetic items) and 'fly with known defects' (which is illegal and dangerous). The system works only when deferrals are visible, time-bound and actually closed — a deferral list that only grows is a maintenance backlog wearing a compliance costume.
Why it matters for flight schools
Deferral discipline separates well-run fleets from lucky ones. The characteristic failures: deferrals invisible to the pilots who dispatch the aircraft, deadlines passing unnoticed, and 'temporary' items quietly becoming permanent. Auditors read deferral logs as an X-ray of maintenance culture — ageing open items and repeat deferrals of the same defect tell them exactly where to dig. A live, honest deferral list, by contrast, is one of the strongest signals of control a school can show.
How FlightLogger handles it
FL Maintenance keeps every open deferral attached to the aircraft's dispatch status with its deadline counting down — visible to pilots, escalating to maintenance before expiry, and blocking release if it overruns.
Frequently asked questions
What is the difference between an MEL deferral and a general defect deferral?
An MEL deferral applies specifically to inoperative equipment listed in the operator's approved MEL, with category-based deadlines. Broader defect deferral covers items assessed as not affecting airworthiness or otherwise permitted for postponement — the assessment and documentation burden sits with the operator.
Who is allowed to defer a defect?
Appropriately authorised personnel — typically certifying staff or the CAMO per the operator's procedures — based on the MEL or an airworthiness assessment. A pilot's squawk cannot be self-deferred by operations staff without that assessment.