Non-routine closure evidence in the modification-baseline source file

When this review is needed

• Embodiment visits on the aircraft produced heavy non-routine volumes and the register has never been reconciled to closures.
• An open-item count in the register disagrees with the deferral log, and the baseline cannot carry both versions.
• A structural or systems defect found during a mod was dispositioned verbally on the floor and the paperwork trail is thin.
• Diligence on a prior transaction accepted non-routine exceptions that were never resolved and now block the baseline.

The problem

Non-routines are written fast, in the middle of other work, by whoever finds the defect. Their closures depend on engineering dispositions, material issue records, and sometimes fresh approved data, and each of those lives in a different system. When the register is finally read as a whole, closures that felt solid at the time turn out to rest on a stamp and a one-line remark, with nothing behind them that a third party could verify.

What gets reviewed

• The full non-routine register for the periods the baseline draws on
• Closure evidence behind each signed-off item: disposition, corrective action, and data basis
• Origin references linking each non-routine to the routine card or modification that raised it
• Material and parts issue records for closures that consumed hardware
• Items transferred to the deferral log, checked for a matching entry there
• Engineering dispositions cited in closures, located in the source file at the cited revision

What gets validated

• Every closed item names the corrective action taken, at a level of detail another mechanic could follow
• Dispositions cited on closures exist in the source package and address the defect as written
• Repairs performed under a non-routine reference identifiable approved data, chapter and figure included
• Parts consumed in a closure carry release certificates matching the part and serial numbers used
• Open counts reconcile across the register, the deferral log, and the work-package close-out

Evidence normally required

• The non-routine register with card images for each entry
• Engineering dispositions and repair data referenced in the closures
• Material issue and parts release records for the affected work orders
• The deferral log covering the same date range
• Routine cards and modification records the non-routines originate from

Common discrepancies

• A closure remark reading along the lines of repaired as required, with no data reference at all
• Non-routines missing origin references, leaving no way to tie them to the modification visit
• An item shown closed in the register while the deferral log still carries it open
• Consumed parts with no issue record, so the installed hardware cannot be traced to a release

What is at stake

Every unsupported closure is a defect whose repair cannot be shown to have happened correctly. On structure or flight-critical systems that ambiguity can force reinspection, and in a transaction it converts directly into holdback or price adjustment. Left alone, the weak closures compound as later maintenance builds on top of them.

How the work runs

What the buyer receives

• A discrepancy schedule keyed to register line numbers, each entry naming the missing evidence
• A reconciliation of open items across register, deferral log, and close-out documents
• Recovery guidance per item, identifying who most plausibly holds the missing record
• A summary suitable for the configuration support package annex

Who uses the output

• Configuration managers who need the defect history under the baseline to be defensible
• CAMO and continuing-airworthiness staff answering for closure quality
• Transaction teams sizing the exposure that weak closures represent

How the work fits into the transaction or program

Non-routines sit between the task-card review and the structural-repair review in the baseline effort. A defect raised on a routine card may end its life as a mapped repair, so exceptions from this strand are cross-checked against both neighbors before they are declared open in the configuration support package.

Jurisdiction-specific considerations

FAA-registered history brings 14 CFR 43.9 content standards to each closure and AC 43-9C as the practice reference, while EASA history under Regulation 1321/2014 routes closure evidence through the operator's continuing-airworthiness record system and its compliance-finding conventions. Registers that span a registry change need each era judged by the rules that governed it.

Regulatory limits

The review evaluates documentation, nothing more. It does not judge whether a repair was technically adequate, does not issue or endorse any airworthiness determination, and grants no approval for data cited in the closures.

What this review does not cover

• Engineering assessment of repair adequacy or defect severity
• Physical inspection of previously repaired areas
• Negotiating closure disputes with the MRO or prior operator

Specific to this review

• Non-routine volume clusters around embodiment visits, so the register quality of one or two check events often determines the whole baseline's defect story.
• A closure that cites approved data without chapter and figure is effectively unverifiable, because the reviewer cannot tell which limit or repair scheme was applied.
• Register-to-deferral-log mismatches usually come from items transferred late in a check, when the transfer was made in one system and never mirrored in the other.
• The single most recoverable evidence type is the engineering disposition, since design organizations retain their own copies long after operators lose theirs.

Sources

Frequently asked questions

Relevant glossary terms

Related pages

Where this fits