What a pre-purchase records audit actually looks at.

The aircraft is not the asset. The record of the aircraft is the asset. A large-cabin Gulfstream with a clean airframe and a gap in its logbooks is worth less than the same aircraft with a scratch on the wing and a complete history — and the gap is harder to fix. That is why the records audit comes first in every pre-purchase inspection I oversee, and why it is the part of the job a buyer should never skip to save a week.

What follows is the order I read them in, what each one is for, and the findings that have stopped closings.

01Logbooks: airframe, engines, APU — and continuity

Three sets of books, minimum, and the first question is not what they say but whether they are complete. Every entry carries a date, aircraft time and cycles, a description of the work, the approving signature and certificate number. I am reading for continuity: does the time at the end of one entry match the start of the next? Does the aircraft disappear for six months and reappear with a fresh inspection and no explanation?

A missing page is a finding. A re-written page is a bigger one. The airframe book that has been “reconstructed” after a loss is a conversation with the seller before anything else happens.

02Inspection program status

Gulfstream maintenance runs on calendar and hourly intervals. The audit confirms which intervals have been accomplished, when, and against which revision of the maintenance manual. Two things matter: that nothing is overdue today, and that nothing lands due in the first ninety days of ownership that the seller has priced as “just inspected.” A 12-month event signed off eleven months ago is a cost the buyer carries, not a selling point.

03Airworthiness Directives and Service Bulletins

The AD compliance list has to reconcile three ways: against the FAA’s current list for the airframe, engines, APU and installed appliances; against the entries in the logbooks that claim compliance; and against the aircraft itself. A list that says “complied with” without a method of compliance, a date and a signature is a claim, not a record. Recurring ADs need the next due visible. Service Bulletins are optional by definition, but the pattern of which ones were done — and which were deferred — tells you how the aircraft was managed.

04Life-limited parts and traceability

Landing gear, engine rotating components, certain structural items: each has a life in hours, cycles or years, and each needs back-to-birth traceability — the chain of paperwork from manufacture to installation. A part with a plausible number on a tag and no chain behind it is, for valuation purposes, a part with no life remaining. This is the single most expensive category of finding, and the one most often missed by a buyer reading the books alone.

A part with a number on the tag and no paperwork behind it is, for the purposes of the deal, a part with no life left.

05Major repairs, alterations and damage history

Every major repair or alteration should have its FAA Form 337 or equivalent, the approved data it was performed to, and — for an alteration — the STC and its flight-manual supplement. I am looking for the repair that is in the structure but not in the books, and the alteration that is in the books but whose STC never transferred. Damage history is not disqualifying; undocumented damage history is.

06Engine and component programs

If the engines are enrolled in an hourly maintenance program, the audit confirms the enrolment is current, paid, transferable and what the transfer costs. Coverage that lapses at closing is a six-figure surprise. The same check applies to any APU or avionics program. Enrolment letters, not verbal assurances.

07Weight and balance, equipment list, flight manual

The current weight and balance report should reflect every alteration in the books. The equipment list should match what is installed. The flight manual should carry every supplement the installed STCs require. These are rarely deal-breakers; they are almost always wrong, and fixing them after closing is cheaper when the seller still has an incentive.

08What the audit produces

A written report, in plain language, that separates three things: what is wrong and must be corrected before closing; what is wrong and should be priced into the deal; and what is missing and must be found. Each finding references the book, the page and the regulation. The buyer gets a document they can hand to counsel, to the lender and to the next pre-buy inspector — because one day they will be the seller.

At OnChain Aviation the audit is run against IronFleet aviOS, which means the findings go into a record that stays with the tail number rather than a PDF in someone’s inbox. If the buyer goes on to a management agreement, the audit is the first entry in the aircraft’s record, not a separate document to be found again later.

09When to start

At the letter of intent. The records can be reviewed before the aircraft moves, before the inspection facility is booked and before anybody spends money on a borescope. Most of the findings that change a price are visible in the books alone; the physical inspection then confirms rather than discovers. Buyers who start the audit after the aircraft is already on jacks pay for the inspection twice.