Deferred maintenance
Airbus A320 family deferred-maintenance records review
This review examines the carried and cleared defects on a specific A320-family aircraft so a buyer, lessor, or new operator can see what is actually open against the airframe. It is run by or for the party taking on the asset, usually ahead of a transfer or an entry onto a new program. It reconciles each deferral to its MEL or CDL basis, its category time limit, and the corrective action that later cleared it or the reason it still stands. You receive an open-item register, a cleared-deferral trail with closure evidence, and a list of entries where the log and the source records disagree.
When this review is needed
- An A320-family tail is transferring and the receiving side needs a settled count of what defects it inherits.
- The deferral log shows items past their MEL category interval with no visible extension or clearance.
- A parked aircraft is returning to service and its accumulated deferrals must be worked down before dispatch.
- A prior operator cleared items verbally or in a system the new operator cannot read back to source.
The problem
A deferral log looks orderly until you try to trace one entry to the fix that closed it. On an A320-family aircraft that has run high daily utilization, the MEL is exercised constantly, and items get raised, extended, and cleared across shift handovers and system migrations. The record of what is truly open at handover blurs into the record of what was once deferred, and a defect nobody flagged becomes the new operator's problem on day one.
What gets reviewed
- Every open deferral matched to its MEL or CDL item, category, and remaining time before it must be cleared
- Cleared deferrals traced to the work order and sign-off that closed them
- Repeat deferrals on the same system flagged where a recurring defect is being reset rather than fixed
- Extensions applied to category-limited items checked for an authorized basis
- Deferrals raised against equipment the aircraft's configuration no longer carries
- Reconciliation of the deferred-maintenance log against the technical log and work-order history
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
- Each open item cites an MEL or CDL reference that applies to this aircraft's configuration
- A cleared deferral shows a corrective action and a return-to-service entry, not just a status change in the log
- Category time limits on open items have not lapsed without a recorded and authorized extension
- Repeat deferrals on one system are visible as a pattern rather than hidden as separate one-off entries
- The open count in the log agrees with what the technical log and dispatch records show as carried
Evidence normally required
- The current deferred-maintenance log or open-defect list for the tail
- MEL and CDL applicable to the aircraft's configuration and operator
- Technical log pages and work orders covering the deferral period
- Return-to-service entries for items recorded as cleared
- Any deferral-extension approvals the operator applied
Common discrepancies
- An open deferral past its category limit with no extension recorded against it
- A cleared item with a status change in the log but no corrective-action record behind it
- The same fault deferred repeatedly on one system, each time reset rather than resolved
- A deferral raised against equipment removed by an earlier cabin or avionics modification
What is at stake
An open deferral carried into service without a valid basis is a dispatch exposure the new operator owns immediately. Cleared items with no closure evidence reopen at the first audit, and a defect that was deferred but never worked can sit dormant until an inspection finds it, by which point the party that raised it has moved on and the cost lands elsewhere.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Pull the open position
Establish the current open-defect list and confirm each item's MEL or CDL basis and remaining category time.
Trace the clearances
Follow each cleared deferral to the corrective action and return-to-service entry that closed it.
Test for patterns
Group deferrals by system to expose repeat items that were reset rather than fixed.
Report the exceptions
List lapsed items, unsupported clearances, and log-to-source conflicts with the evidence for each.
What the buyer receives
- An open-item register listing each carried deferral, its basis, and its remaining time
- A cleared-deferral trail linking each closed item to its corrective action and sign-off
- A discrepancy list where the log disagrees with the technical log or work-order history
Who uses the output
- Asset managers settling what defects transfer with the aircraft at handover
- Continuing-airworthiness teams working the open list down before return to service
- Records teams reconciling the deferral log to source before the next audit
How the work fits into the transaction or program
The deferral review usually runs alongside the broader records read on an incoming A320-family tail, because the open-defect position drives what has to be worked before the aircraft dispatches. Its open-item register feeds the induction plan, and its cleared-deferral trail becomes part of the evidence the new operator relies on at its first review.
Aircraft-specific considerations
A320-family aircraft accumulate deferrals fast under the high daily cycle counts typical of the type, and cabin and avionics modifications over a long service life mean some historic deferrals point at equipment that is no longer fitted. Landing-gear and system deferrals raised during heavy utilization are the ones most likely to be reset rather than cleared, so the review weights those.
Regulatory limits
The review reports what the deferral records support and where they conflict. It does not clear a deferral, grant an MEL extension, authorize dispatch, or make any airworthiness determination on the open items it lists.
What this review does not cover
- Performing or signing off the corrective action behind any deferral
- Granting or extending an MEL or CDL relief
- Any dispatch or airworthiness decision on the open list
Specific to this review
- The dangerous entry is the cleared deferral with a log status change but no corrective-action record, because it reads as closed until an audit asks for the fix.
- Repeat deferrals on one system are the tell that a defect is being reset each cycle rather than resolved, and a flat log hides that pattern.
- On a long-lived A320-family tail, a deferral can name equipment a prior modification already removed, which means the item can neither be worked nor cleanly closed.
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
Does a cleared entry in the deferral log mean the defect was actually fixed?
Not on its own. A log can be updated to cleared without a corrective-action record behind it. This review traces each cleared item to the work order and return-to-service entry, and flags the ones where the closure exists only as a status change.
Relevant glossary terms
Related pages
Where this fits
Talk to an engineer who has done this work
We will walk through your current state, the records or evidence involved, and a scoped first engagement.
Talk through the aircraft, records, evidence, deadline, and next useful step.