Before the deal signs
Airworthiness Directive status verification for lessors ahead of a transaction
This review verifies a lessor's Airworthiness Directive status list against the accomplishment evidence behind it before a sale, a lease return acceptance, or a financing review. A technical-records specialist works through applicability, method of compliance, and next-due calculations for airframe, engine, APU, and appliance ADs. It runs on the lessor's side of the table, early enough that missing documents can still be recovered from former operators and shops. The output is an AD-by-AD exception register, the evidence located for each verified line, and a closure plan sequenced against the deal timeline.
When this review is needed
- A purchase agreement or letter of intent is signed and the buyer's technical team will audit AD compliance during its review period.
- A lease return is approaching and the redelivery conditions require an AD status the lessor can evidence document by document.
- A financier or appraiser has asked for the records behind the AD summary before extending or renewing a facility.
- The aircraft is entering remarketing and the lessor wants the status list defensible before the data room opens.
The problem
An AD status list looks finished until someone asks for the record behind a single line. Lessors hold aircraft that other parties maintained, so the evidence for a closed AD often sits in a former operator's work-order archive rather than in the lessor's own files. Deal timelines compress exactly when document retrieval is slowest, and the technical team ends up defending status entries it never created.
What gets reviewed
- Applicability review for airframe, engine, APU, and appliance ADs against the serial number and installed configuration
- Method-of-compliance verification for each AD reported closed, including claims of terminating action
- Last-done and next-due values for repetitive ADs checked against current utilization
- AMOC approvals confirmed to cover this serial number and the compliance method actually recorded
- Superseded and superseding directives mapped so status is stated against the current AD
- Retrieval targets identified for lines whose accomplishment records sit outside the lessor's files
Scope this review
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What gets validated
- Every AD reported complied with is matched to a work order, task card, or logbook entry naming the aircraft and the directive
- Terminating-action closures cite the SB revision the AD accepts as terminating, with the SB accomplishment record attached
- Next-due figures for repetitive ADs recompute correctly from the recorded compliance point and the utilization basis the directive specifies
- Not-applicable determinations rest on effectivity, configuration, or modification evidence rather than assertion
- Each AMOC reference corresponds to an approval letter on file whose conditions the recorded compliance actually met
Evidence normally required
- The current AD status list for airframe, engines, and APU as exported from the tracking system
- Work orders, task cards, and logbook entries supporting AD accomplishment
- AMOC approval letters and related compliance correspondence
- Current times, cycles, and utilization data for next-due verification
- Modification and configuration records used for applicability decisions
Common discrepancies
- An AD shown closed by terminating action where the recorded SB revision predates the revision the directive accepts
- Repetitive ADs with next-due dates computed on flight hours where the directive specifies cycles
- Not-applicable entries carried forward from a prior operator without an applicability assessment for this configuration
- An AMOC cited on the status list with no approval letter anywhere in the lessor's records
What is at stake
Once a buyer's reviewer finds one AD line without accomplishment evidence, the sample widens and every later question costs negotiating position. Open AD exceptions turn into purchase-price holdbacks, extended escrow, or return-condition disputes, and a repetitive AD with a miscalculated next-due date can stall a closing while utilization data is re-derived from scratch.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Baseline the list
Freeze the AD status list at an agreed data date and confirm the applicable AD population from FAA and EASA sources.
Trace each closure
Match complied-with and not-applicable entries to accomplishment records, applicability evidence, and AMOC approvals.
Recompute what recurs
Verify last-done and next-due values for repetitive ADs against recorded utilization and the basis each directive specifies.
Report and sequence
Deliver the exception register with a closure plan ordered by deal deadline and retrieval difficulty.
What the buyer receives
- An AD-by-AD exception register stating what evidence was located, missing, or contradictory for each flagged line
- A cross-reference tying each verified status entry to its supporting document
- A retrieval and closure plan ordered by deal deadline and recovery difficulty
Who uses the output
- Transaction managers deciding what to disclose, cure, or negotiate before sign-off
- The lessor's records team chasing documents from former operators and MROs
- Counsel and financiers assessing exposure on representations about AD compliance
How the work fits into the transaction or program
This work sits between routine status tracking and the counterparty's own audit. Running it on the lessor's side, before marketing hardens into a timeline, leaves room to recover documents from prior custodians, and the exception register becomes the working list the deal team clears before the data room opens or redelivery acceptance begins.
Jurisdiction-specific considerations
FAA and EASA directives can apply on different schedules to the same hardware, and an aircraft moving between registries may face state-of-design ADs the outgoing status list never tracked. The review reports the FAA and EASA positions separately so the receiving registry's expectations are visible before the transfer is committed.
Regulatory limits
This is a records verification, and its conclusions are limited to what the documents show. It does not determine airworthiness, does not approve or reject any method of compliance, and does not substitute for the judgment of the certificate holder or the responsible authority.
What this review does not cover
- Physical inspection of the aircraft or verification that accomplished work exists on the airframe
- Engineering assessment of whether a chosen compliance method was technically adequate
- Preparation or submission of AMOC requests to the FAA or EASA
Specific to this review
- Buyer review teams rarely check every AD; they sample, and a single unsupported line typically triggers a wider sample and a slower review.
- Terminating-action closures are the most frequently challenged entries because they depend on an SB revision match that summary lists never display.
- Evidence for ADs accomplished under a former operator degrades with time; a request made during marketing succeeds far more often than one made during escrow.
- A next-due error on one repetitive AD casts doubt on the forecasting basis for all of them, which is why reviewers recompute rather than accept the list.
Sources
U.S. Government (eCFR). The legal basis for issuing and enforcing Airworthiness Directives on U.S.-registered products.
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
How far ahead of a transaction should a lessor start this review?
Retrieval sets the timeline, and the checking itself does not. Comparing the list to available evidence takes days to a few weeks depending on the asset, but recovering a missing work order from a shop or former operator can take months. Starting when remarketing begins, rather than when the buyer's team arrives, keeps closure inside the deal window.
Relevant glossary terms
Related pages
Where this fits
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We will walk through your current state, the records or evidence involved, and a scoped first engagement.
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