Managed fleets
Restoring the configuration baseline for a managed aircraft
Configuration baseline gap remediation reconciles what is physically installed on a managed aircraft with what its records claim. Aircraft-management teams run it, often on behalf of an owner, after an inspection, an avionics upgrade, or a records audit shows the equipment list, modification status, and logbooks no longer describing the same aircraft. Each divergence is traced to a specific installation, removal, or paperwork lapse, and the evidence supporting the true configuration is gathered or flagged as unrecoverable. The result is a corrected baseline with substantiation behind every line, plus an open-items list for anything still needing approved data or release paperwork.
When this review is needed
- A pre-buy or insurance survey found equipment on the aircraft that no logbook entry installs.
- An avionics or interior upgrade was completed but the STC paperwork stayed with the installer.
- The management company inherited the aircraft from a prior manager and the delivered records never matched the panel.
- The owner wants to sell and the broker's technical reviewer keeps finding baseline inconsistencies.
The problem
Managed aircraft change hands between management companies more often than their records change custody cleanly. Every transition, upgrade, and shop visit leaves a chance for an installation to be recorded partially, filed with the wrong operator, or never returned by the vendor. Maintenance control then plans work against an equipment list that quietly stopped being true, and nobody can say which document is authoritative.
What gets reviewed
- Line-by-line comparison of the equipment list against logbook installation and removal entries
- Modification and STC status checked against the approvals and instructions actually on file
- Weight-and-balance amendments matched to the installations that should have generated them
- Release documentation confirmed for serialized units currently installed
- Identification of which record set is authoritative where duplicates disagree
- An evidence plan for every unsupported configuration line
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 installed serialized unit has an installation entry and a matching release document
- Each embodied modification carries its approval reference and, where required, its ICA
- Removals are closed out, so the records do not still show equipment that left the aircraft
- The current weight-and-balance report reflects the modifications the logbooks say are embodied
- Configuration entries created during remediation cite the source document they rest on
Evidence normally required
- Current equipment list, weight-and-balance report, and modification status summary
- Airframe and avionics logbooks covering the disputed period
- STC packages, FAA Form 337s or equivalent alteration records, and installer work orders
- Release certificates for installed serialized components
- Records delivered by any prior management company, as received
Common discrepancies
- Avionics units installed under an STC whose paperwork was never delivered by the shop
- Equipment-list lines carried forward from a sister aircraft during a template copy
- Alteration records on file for equipment that was later removed without a closing entry
- Weight-and-balance data that predates two embodied modifications
What is at stake
A configuration record that misstates the aircraft undermines everything built on it. Weight-and-balance data, MEL applicability, ICA tracking for modifications, and any future sale all inherit the error, and an owner discovering the gap during a transaction tends to hold the management company responsible for it.
Move from findings to resolution
Sequence the fixes and the documentation that closes each finding.
How the work runs
Inventory the claims
Assemble every document that asserts configuration, from equipment list to alteration records, and note where they disagree.
Trace each divergence
Follow each disputed line to the installation, removal, or management transition where the records and the aircraft parted ways.
Recover the evidence
Request the missing approvals, releases, and work orders from installers and prior custodians while the trail is warm.
Rebaseline with sources
Publish the corrected configuration baseline with a citation per line and a tracked list of residual gaps.
What the buyer receives
- A reconciled configuration baseline with a source reference on every line
- A gap register separating recoverable paperwork from items needing new approved data
- Targeted document requests to installers, prior managers, and the repair stations that touched the aircraft
- A closure memo the owner representative can rely on in the next transaction
Who uses the output
- Maintenance control planning against a baseline they can finally trust
- Owner representatives who need the aircraft's paper identity settled before a sale
- Records staff maintaining the corrected baseline going forward
How the work fits into the transaction or program
Baseline remediation usually follows a survey or audit and precedes whatever exposed the gap: a listing for sale, an insurance renewal, or entry to a new maintenance provider. Once closed, the corrected baseline feeds configuration-dependent records such as the MEL, the weight-and-balance system, and ICA tracking, and it shortens every future pre-buy.
Jurisdiction-specific considerations
For FAA-registered aircraft, alterations rest on 14 CFR 43 performance and recording rules and the retention duties of 14 CFR 91.417, with major alterations documented on FAA Form 337. EASA-managed aircraft record the same events through Part-145 releases and Part-M continuing-airworthiness records under Regulation (EU) 1321/2014, so a mixed-history aircraft often needs its baseline evidence read against both systems.
Regulatory limits
The remediation establishes what the evidence shows is installed and approved. It does not generate approved data for undocumented alterations, issue any release to service, or determine airworthiness; where an installation lacks a basis, the finding is recorded and the approval path is left to the appropriate certificate holders.
What this review does not cover
- Physical inspection, panel opening, or borescope work to verify installations
- Obtaining new STCs or field approvals for undocumented alterations
- Ongoing configuration management after the corrected baseline is handed over
Specific to this review
- Template-copied equipment lists are a recurring source of phantom configuration lines on managed fleets, because a sister aircraft's list is a tempting starting point.
- Installer-held STC paperwork is usually recoverable for years after the work, but the request needs the work-order number, which is why the logbook trail is rebuilt first.
- A removal without a closing entry is as damaging as an undocumented installation; both leave the records describing an aircraft that does not exist.
- Owners change management companies more readily than records custody transfers cleanly, so the delivered-records inventory from each transition is treated as evidence in its own right.
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.
Frequently asked questions
The aircraft flies and passes inspections, so why does a baseline gap matter now?
Because the gap prices itself into the next event. A buyer's reviewer will discount for unsupported configuration lines, an ICA obligation attached to an undocumented modification is invisible to the maintenance program, and a management company that certifies status to an owner is exposed for whatever the baseline misstates. Closing the gap while installers and prior managers still hold their files is far cheaper than reconstructing later.
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.