Installed configuration
Equipment list accuracy for an owner-managed aircraft
An equipment-list source review tests whether a managed aircraft's list describes what is actually installed. Each line is reconciled against installation and removal records, exchange paperwork from AOG events, and the release documents behind serialized units, and every circulating version of the list is compared. Run for the owner representative before a sale or provider transition, it delivers a line-marked list, an exception register, and a recommendation naming the single version to maintain.
When this review is needed
- AOG exchanges over the years were handled by line stations far from base and never fed back into the list.
- Avionics units have rotated through repair with serial changes that no one recorded.
- The buyer's inspection will compare data plates on the aircraft against the list, unit by unit.
- The provider's tracking system and the owner's file publish two different equipment lists.
The problem
Every exchange fitted during an AOG event away from base is a chance for the list to drift. The unit changed, the invoice was paid, and the list stayed untouched because the paperwork came home through accounts payable instead of records. Managed aircraft collect these quietly, since line maintenance happens wherever the aircraft happens to be.
What gets reviewed
- Line-by-line reconciliation of the list against installation and removal records
- Serial-number currency for serialized units checked against the latest exchange documents
- Alignment with the modification status report for equipment installed by modification
- Release documents matched to the serials currently installed, connecting into the component review
- Loose and role equipment inventoried against the list's own categories
- Version control across owner, provider, and onboard copies of the list
Scope this review
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What gets validated
- Each serialized line matches the most recent installation record for that position
- Removals show where the outgoing unit went, and exchanges show the incoming unit's release
- Equipment added by modification appears with its approval reference attached
- Units placarded on the aircraft, where survey photos exist, agree with the serials listed
- Exactly one controlled current version of the list exists across all systems
Evidence normally required
- Every circulating version of the aircraft equipment list
- Component installation and removal records or the tracking export behind them
- Exchange and loan paperwork from AOG events
- The modification status report
- Recent survey photos or delivery inventories where available
Common discrepancies
- An exchanged transponder or radio still listed under its pre-exchange serial
- A loaned unit fitted during an AOG that was never swapped back and never listed
- Equipment installed by modification present on the status report and absent from the list
- Three active versions of the list in three systems, none of them complete
What is at stake
A wrong list fails on the ramp during the buyer's walkaround, which is the cheapest possible discovery for the buyer and the worst optics for the seller. Beyond the optics, the list feeds weight and balance, modification status, and the release-document review, so one stale line can corrupt three other workstreams at once.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Choose the base version
Collect every circulating copy of the list and select the most defensible one as the working base.
Reconcile the lines
Check each line against installation, removal, and exchange records, marking its status.
Cross-link the siblings
Connect serialized units to release documents and modification-installed equipment to its approvals.
Publish and consolidate
Deliver the reconciled list, the exception register, and the single-version recommendation.
What the buyer receives
- A reconciled equipment list marked line by line: verified, corrected, or excepted
- An exception register naming the record needed to close each open line
- A version-control recommendation designating the single list to maintain forward
Who uses the output
- The owner representative staging the aircraft for the buyer's inspection
- The incoming provider seeding its tracking system with a configuration it can trust
- The records team retiring the redundant list versions
How the work fits into the transaction or program
The equipment list is the reference the physical walkaround gets checked against, so this review closes last among the owner-managed file checks and consumes their outputs, especially the modification and release-document exceptions. Its corrected list is what the handover baseline publishes as configuration.
Jurisdiction-specific considerations
Neither FAA nor EASA prescribes one equipment-list format for private operations, but both require records from which current configuration can be determined, through owner record duties on the FAA side and continuing-airworthiness record rules on the EASA side. Market practice differs more than law here: EASA-based reviewers typically expect tighter component-level control than a domestic file usually shows, and the review calibrates its exceptions to the audience.
Regulatory limits
Configuration conformity is not certified, installations are not approved, and no airworthiness determination is made. The review establishes whether the documentary record supports the list. Whether the aircraft physically conforms is an inspection matter that this work prepares for but does not perform.
What this review does not cover
- Physical audit of installed units, which the reconciled list supports but does not include
- Functional testing of avionics or systems
- Recovery or disposal of loaned and exchanged units
Specific to this review
- AOG exchanges away from the main provider are the dominant source of list drift, because their paperwork returns through billing rather than through records.
- Serial mismatches on placarded avionics are among the first things an experienced inspector checks, precisely because they take thirty seconds to check.
- Correcting a line without the supporting installation record just relocates the exception; the record has to exist before the line can be marked verified.
- The number of active list versions tends to equal the number of provider transitions the aircraft has had, because every handover cloned a copy.
- Loose-equipment categories are commercially minor and contractually noisy, since sale agreements enumerate covers, spares, and tooling item by item.
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. Completion and use of FAA Form 8130-3, Authorized Release Certificate, for new and used parts.
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
Could we just inventory the aircraft physically and rewrite the list from scratch?
A physical inventory establishes what is fitted today and says nothing about the record behind it. Serialized units still need their installation and release paperwork connected before a buyer accepts the line. The two exercises pair well, because each covers exactly what the other cannot.
Relevant glossary terms
Related pages
Where this fits
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