Deferred maintenance
Airbus A220 family deferred maintenance records review
This review examines the open deferred maintenance on a specific Airbus A220 and confirms each item is deferred against a valid basis and is still inside its allowable interval. A records specialist runs it before acceptance, at redelivery, or when the deferral log has grown unwieldy, working from the deferred maintenance log, the MEL and CDL references cited, and the corrective actions that closed prior items. Each open deferral is checked for a category, a start date, and a clearing path. You receive an exception list of items out of interval or without a basis, a source map to each deferral and its clearing entry, and a closure plan for this airframe.
When this review is needed
- An A220 is being accepted and every open deferral must be shown to sit on a valid MEL basis and inside its interval.
- A redelivery condition limits open items and the lessor needs the deferral log reconciled before handover.
- The deferred maintenance log has grown across several checks and needs pruning to current, valid entries.
- Deferrals cleared in prior periods need confirming as closed so they do not carry forward as open.
The problem
A deferred maintenance log is a live list that only stays honest if every item carries its MEL or CDL category, its deferral date, and a clearing path, and those fields erode under operational pressure. An item deferred at the line gets a category but no firm interval tracking, a repetitive deferral gets re-raised without linking to the original, and items cleared during a check sometimes stay open on the log because the clearing entry landed in a work package instead of the deferral system. The count of open items stops meaning what it should.
What gets reviewed
- Each open deferral checked for a valid MEL or CDL category and a recorded start date
- The elapsed time against each item's allowable deferral interval
- Corrective actions and clearing entries reconciled against items shown as closed
- Repetitive deferrals linked to their originating item rather than re-raised in isolation
- Items cleared in work packages confirmed as closed on the deferral log
- Deferrals with no basis, no start date, or an expired interval flagged for closure
Scope this review
Tell us the asset, the event, and the evidence in scope, and we will outline a focused first engagement.
Send a representative, redacted record set and we will scope the review.
What gets validated
- Every open deferral cites a valid MEL or CDL category with a recorded deferral date
- No open item has run past its allowable deferral interval without action
- Items shown as cleared have a corrective action or clearing entry behind them
- Repetitive deferrals trace back to the original item and its accumulated history
- The open-item count on the log matches the deferrals genuinely still open
Evidence normally required
- The current deferred maintenance log for the airframe
- The MEL and CDL applicable to the operator and type, with the categories cited
- Corrective action and clearing records for closed deferrals
- Work packages that may hold clearing entries not reflected on the log
- Logbook entries raising and clearing deferrals
Common discrepancies
- An open deferral with no MEL or CDL category recorded against it
- An item that has run past its allowable interval still shown as an active deferral
- A deferral cleared in a work package but still open on the deferred maintenance log
- A repetitive item re-raised without linking to its original deferral history
What is at stake
A deferral that has run past its allowable interval or that cites no valid category is not a deferral at all, and carrying it as one misstates the airworthiness position the receiving operator inherits. On a transaction, open items outside interval either block acceptance or become the buyer's cost to clear, and a log that has drifted from its clearing records forces a line-by-line reconciliation in the window where there is least time for it.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Take the open log
Start from the deferred maintenance log as the set of items claimed still open.
Test basis and interval
Check each item for a valid MEL or CDL category, a start date, and time remaining in interval.
Reconcile the clearings
Match items shown closed to a clearing record and find clearings stranded in work packages.
Sequence the closure
Recommend for each item whether it is cleared, re-based, or corrected on the log.
What the buyer receives
- An exception list of deferrals without a basis, out of interval, or wrongly shown open
- A source map linking each deferral to its MEL basis and its clearing record
- A closure plan sequencing which items are cleared, re-based, or corrected on the log
Who uses the output
- Asset managers assessing the open-item position before acceptance or redelivery
- CAMO and records teams reconciling the deferral log to its clearing records
- Line-maintenance leadership responsible for clearing items within interval
How the work fits into the transaction or program
The deferred maintenance review settles the open-item position that acceptance and redelivery both hinge on. It gives the receiving operator a log where every entry has a basis and an interval, and it feeds the clearing team a prioritized set of items rather than a count that has drifted from reality.
Aircraft-specific considerations
The A220 uses an MEL and CDL structure like any Part 25 transport, and its avionics and cabin systems generate the deferrals most likely to be re-raised repetitively rather than closed. Because the type is often on a young operator's expanding fleet, the deferral log can reflect several rapid check cycles, so a review commonly finds clearing entries stranded in work packages rather than a deep backlog of genuinely open items.
Jurisdiction-specific considerations
MEL approval and the acceptable form of deferral tracking sit with the operator's authority, so an A220 moving between FAA and EASA operators will have its deferrals framed against a different approved MEL. The review notes where an item's category or interval was based on the outgoing operator's MEL and needs re-basing against the receiving operator's approved document.
Regulatory limits
The review reports whether deferrals are supported and within interval. It does not approve an MEL, authorize a deferral, issue an airworthiness determination, or replace the operator's dispatch and continued-airworthiness decisions.
What this review does not cover
- Clearing or rectifying any deferred item on the aircraft
- Approving or amending the operator's MEL or CDL
- Making a dispatch decision on any open item
Specific to this review
- An expired deferral is not a deferral, so an item past its allowable interval misstates the airworthiness position until it is re-based or cleared.
- Clearing entries stranded in work packages are the most common reason a log shows more open items than truly remain.
- On the A220 the avionics and cabin systems drive repetitive deferrals that must link to an origin rather than be re-raised fresh each time.
- A deferral's MEL category and interval depend on the operator's approved document, so they do not carry unchanged across an operator transition.
Sources
U.S. Government (eCFR). Maintenance recordkeeping content and approval-for-return-to-service requirements, including 43.9, 43.11, and Appendix B.
U.S. Government (eCFR). Records an owner or operator must keep, including total time in service, current status of life-limited parts, and AD compliance.
European Union / EASA. Continuing airworthiness, maintenance records, CAMO responsibilities, and the airworthiness review process in the EASA system.
International Civil Aviation Organization. International standards for aircraft operation, including maintenance program and recordkeeping expectations.
Frequently asked questions
Why check the deferral log against the MEL if the items are already recorded?
Because a recorded deferral only holds if it cites a valid category and sits inside its interval. The review confirms each open item still has a basis and time remaining, and it catches deferrals that expired or that were cleared in a work package but never closed on the log.
Relevant glossary terms
Related pages
Where this fits
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