Plain English Meaning

Putting off a repair on the airplane in a way that's officially allowed, so the aircraft can keep flying for a while before the fix is actually done.

Full Definition

The authorized practice of postponing the repair or replacement of an inoperative item of aircraft equipment, allowing the aircraft to continue in service for a defined period under specified conditions. Deferrals are governed by the operator's Minimum Equipment List (MEL) or, for aircraft without an MEL, by 14 CFR §91.213(d), and each deferral must be properly documented and the inoperative item appropriately placarded.

Context Anchor

Seen when deciding whether an aircraft with inoperative equipment may legally and safely be flown.