GTF non-routine work
Geared turbofan engine non-routine records review
This review confirms that the defects raised on a geared turbofan engine were dispositioned, corrected, and closed with the evidence to prove it. It is run when a GTF asset is being evaluated, transferred, or held and the non-routine history has to be trusted. It checks defect cards, engineering dispositions, corrective-action entries, and the final sign-offs that close each item against the non-routine register. You receive an exception list of items whose closure is not supported, a source map per defect, and a closure plan for the serial number.
When this review is needed
- A shop visit generated heavy non-routine findings and the closures have to be verified before acceptance.
- A defect card references an engineering disposition that no one has confirmed is on file.
- The register shows items open that the logbook implies were cleared, and the two must be reconciled.
- A GTF engine is transferring and the buyer wants the non-routine history closed with evidence.
The problem
Non-routine work is where a shop visit's real story lives, and it is the hardest part to keep clean. A defect card raises a finding, an engineering disposition decides how to treat it, a corrective action does the work, and a final sign-off closes it, but any link in that chain can be missing while the register still shows the item closed. On a geared turbofan the disposition often invokes approved repair data or a fleet campaign, and the reference that ties the closure to that basis is easy to lose.
What gets reviewed
- Each defect card matched to its engineering disposition and corrective action
- Dispositions tied to the approved or acceptable data they rely on
- Corrective-action entries showing the work that cleared each finding
- Final sign-offs closing each item, present and attributable
- The non-routine register reconciled to the logbook and shop-visit report
- Items the register shows open carried as tracked exceptions with their status
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 defect card on the register traces to a disposition and a closing sign-off
- Each disposition invoking a repair basis references approved or acceptable data
- Corrective-action entries account for the work the disposition called for
- Register status agrees with the logbook and the shop-visit report for the same event
- Items shown closed have the evidence a later auditor would accept as closing them
Evidence normally required
- The non-routine register or defect log for the engine
- Defect cards, engineering dispositions, and corrective-action records
- Approved or acceptable repair data the dispositions rely on
- Shop-visit reports that generated the non-routine work
- Logbook entries covering the same events for reconciliation
Common discrepancies
- A defect marked closed on the register with no disposition on file
- A disposition invoking a repair basis that is not referenced or attached
- A corrective action recorded without the final closing sign-off
- Register status that disagrees with the logbook for the same shop visit
What is at stake
A defect marked closed on the register but missing its disposition or corrective-action evidence is an open exposure the owner carries silently. At the next induction the finding reopens with the shop and its people no longer available, and a disposition that cannot be shown to rest on approved data can force the repair to be re-substantiated or the area re-worked.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Pull the register
List every non-routine item raised for the engine and its recorded status.
Follow each chain
Match defect card to disposition, corrective action, and closing sign-off for each item.
Confirm the basis
Check that dispositions invoking a repair reference approved or acceptable data.
Reconcile and list
Compare register status to the logbook and record the unsupported closures.
What the buyer receives
- An exception list of non-routine items whose closure is not supported by evidence
- A source map linking each defect to its disposition, action, and sign-off
- A closure plan for the unsupported items on the serial number
Who uses the output
- Records teams reconciling a shop visit's non-routine work before it enters the file
- Engineering confirming that dispositions rest on data that can be shown
- Asset managers weighing the exposure the open non-routine items represent
How the work fits into the transaction or program
Non-routine review picks up the defects that the routine task cards raised and follows each to its close. Where a disposition invoked a repair, the trail continues into the structural-repair and modification records; where a defect was deferred, it connects to the deferred-maintenance log the engine also carries.
Aircraft-specific considerations
Geared turbofan shop visits generate dense non-routine findings around the gear system and hot section, and dispositions there frequently invoke fleet campaigns or time-limited repair schemes. The review checks that each disposition names the campaign or scheme it rests on, because a closure that only cites an internal decision does not survive a later audit on this type.
Jurisdiction-specific considerations
An engineering disposition acceptable in an FAA environment may need a different substantiation basis under EASA, so a defect closed under one system can leave a receiving operator in the other without a valid closing basis. The review flags dispositions whose data basis does not carry across the two systems.
Regulatory limits
The review verifies that non-routine items were closed with traceable evidence. It does not re-disposition a defect, approve a repair, or determine that the engine is airworthy.
What this review does not cover
- Re-dispositioning or re-working any defect on the engine
- Approving repair data or issuing a certifying statement
- Any airworthiness determination on the engine
Specific to this review
- A register can show an item closed while the disposition, corrective action, or sign-off that closes it is absent, so status alone proves nothing.
- Gear-system and hot-section dispositions on this type often rest on fleet campaigns, and a closure that omits the campaign reference fails at audit.
- Non-routine closures are the first records to decay once a shop and its people move on, so they are reconstructed hardest after the fact.
Sources
U.S. Government (eCFR). Maintenance recordkeeping content and approval-for-return-to-service requirements, including 43.9, 43.11, and Appendix B.
Federal Aviation Administration. FAA guidance on making and keeping maintenance records and acceptable recordkeeping practices.
European Union / EASA. Continuing airworthiness, maintenance records, CAMO responsibilities, and the airworthiness review process in the EASA system.
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.
Frequently asked questions
Why check non-routine records if the register already shows everything closed?
The register records a status, not the evidence behind it. An item can read as closed while its disposition, corrective action, or final sign-off is missing. The review tests whether each closure is actually supported, because an unsupported one reopens at the next induction with the exposure landing on the current owner.
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.