Aviation glossary · Maintenance and productionDeferred defect
A defect that has been assessed and permitted to remain unrepaired for a defined period under the MEL or another approved basis.
Why it matters
Deferrals accumulate. A fleet's real condition is often better described by its open deferral list than by its last check.
In AerSynx
Open items report into the same horizon as everything else due, so a growing deferral list is visible rather than discovered. MEL / CDL →