Every used part offered on the open market arrives with the same phrase attached: traceable to a certificated source. Buyers ask for it, sellers promise it, and almost nobody writes down what it means. For an operator in Lagos, Dhaka or Jakarta the vagueness is expensive — the unit lands, the quality manager rejects the file, and the aircraft stays on ground while a second part is sourced at AOG pricing.

The phrase is not marketing language. It comes from a specific paragraph of a specific FAA advisory circular, and it means something narrower than most buyers assume. This guide sets out what the regulators actually wrote about USM traceability, what each document in a used serviceable material package proves, what it does not prove, and what to verify before money moves.

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Where the phrase actually comes from

FAA Advisory Circular 20-62E, Eligibility, Quality, and Identification of Aeronautical Replacement Parts, lists the sources of parts an installer may treat as acceptable. Paragraph 8d(7) covers used material in one line: parts with removal records showing traceability to a U.S.-certificated aircraft, signed by an appropriately certificated person.

Read that slowly, because three separate conditions are packed into it. There must be a removal record, not a seller statement. That record must show traceability to a certificated aircraft, not merely to a company that once held the part. And it must be signed by a certificated person — an individual or organisation with an approval, not a sales desk.

The same AC lists the forms that carry an approval for return to service: in paragraph 7g it names a repair station tag, a work order, FAA Form 337, FAA Form 8130-3, or a maintenance record entry. Paragraph 8a puts the same idea in purchasing terms — the records accompanying a part should include a maintenance release, return to service tag, repaired parts tag, FAA Form 8130-3 or a repair station work order.

Paragraph 8c is the one that catches buyers out. It flags “unusual circumstances” that demand extra documentation: parts taken from non-certificated aircraft, parts subjected to extreme stress, and parts recovered from salvaged aircraft or components. A part with a clean-looking tag can still fall into this category, and the tag will not say so.

One phrase, two regulatory systems

There is no single global definition. AC 20-62E is an FAA document and its wording points at a U.S.-certificated aircraft. In the European system the equivalent assurance is carried by an EASA Form 1 issued by an approved maintenance organisation, and the acceptability of any given package is decided by the operator’s own authority and its approved procedures — not by the seller and not by the exporting country.

This matters directly for buyers in Africa, South Asia and Southeast Asia, where the national authority typically recognises foreign releases under its own conditions rather than automatically. We covered how that acceptance test works in practice for operators without an in-house CAMO in our guide to release document checks when you have no CAMO, and how two specific regulators handle imported paperwork in the guides to DGCA acceptance in India and imports into Indonesia and the Philippines.

The practical rule: ask which authority will accept the part before you ask what the paperwork says. A file that satisfies an FAA-based procedure may still need a conversion or an additional statement in another jurisdiction.

What an accredited distributor is — and is not

A large share of USM moves through distributors rather than directly from operators or MROs. The FAA addresses this through a voluntary scheme described in AC 00-56B, the Voluntary Industry Distributor Accreditation Program, which the AC itself describes as a system for accrediting civil aircraft parts distributors based on voluntary industry oversight, intended to help certificated persons establish the eligibility of parts for installation.

The obligations are concrete. Under paragraph 6.b(1) an accredited distributor’s receiving inspection must confirm that products are accompanied by documentation that shows the prior source of the product or article. Paragraph 6.b(13) requires a process for maintaining the documents originally received with the parts being sold and shipped, the documents shipped with the parts, and any other documents establishing the condition and origin of parts received and shipped. Paragraph 4.h states that for an accredited distributor, traceability must meet the minimum standards found in the documentation matrix in Appendix 1.

That appendix draws the line buyers should memorise. Used parts maintained under U.S. standards need an approval for return to service meeting the provisions of 14 CFR 43.9, 43.11 or 43.17. Used parts maintained abroad need an approval for return to service meeting the requirements of the foreign maintenance standards. In both cases the assurance comes from a maintenance approval — the distributor forwards it, it does not create it.

And the limit: the programme is voluntary and does not constitute a regulation. Accreditation says a company’s quality system was audited against a standard. It is not an FAA approval of any individual part in that company’s stock. Treating an accreditation logo as a substitute for reading the file is the single most common mistake in USM purchasing.

What an ATA 106 form does and does not certify

Most USM offers travel with a Part or Material Certification Form built to ATA Specification 106. It is worth knowing exactly what is on it, because it is the document buyers most often mistake for an airworthiness approval.

The form carries the seller’s name and reference, the buyer’s purchase order, the item description, manufacturer and part number, quantity, and serial or batch numbers. It then states the status of the material, using the short condition codes the trade runs on. Two blocks do the real work: Traceable To, naming the source the seller obtained the item from, and Last Certified Agency, naming the organisation that last worked on it. The form ends with two separate verification blocks and signatures — one headed New Parts/Material Verification, attesting that the item was produced by a holder of a production approval, and a separate one headed Used, Repaired or Overhaul Parts Verification, attesting that the accompanying documentation is accurate.

Note what that second declaration commits the seller to. It is a statement about the accuracy of the paperwork, signed by the seller. It is not a release to service, and no authority signs it. An ATA 106 form with an empty or vague Last Certified Agency block is not a minor formatting problem — it is the absence of the very link that the FAA paragraph above requires.

USM traceability: what each document actually proves

Document	What it proves	What it does not prove
FAA Form 8130-3 / EASA Form 1	An approved organisation released the item for the work stated on the form	That the item was overhauled — a release for “inspected/tested” covers only that work
ATA Spec 106 form	The seller’s declaration of the source and the last certificated agency	Airworthiness — it is an industry form signed by the seller, not an authority release
Removal or teardown record	The unit came off an identified aircraft or engine, signed by a certificated person	Current condition or remaining useful life
Back-to-birth records for life-limited parts	Accumulated cycles and hours since new, against the published limit	That the part is serviceable today
Distributor accreditation certificate	The company’s quality system was audited against a published standard	Approval of any individual part in that company’s stock
Invoice or shipping memo	That a commercial transaction took place	Anything at all about eligibility for installation

Life-limited parts: the one place there is no flexibility

Industry practitioners are blunt about where the tolerance for a thin file drops to zero. Daniel Koehler of APACS, quoted in an AviTrader review of USM airworthiness published in October 2025, put it plainly: for life-limited parts in particular, back-to-birth records are non-negotiable. In the same review Arūnas Ganiprauskas of FL Technics set out what a complete package looks like for hard-time and life-limited parts — traceability records showing operating history, life limits, and compliance with airworthiness directives and service bulletins.

Alison Williams, quality engineer at AerFin, described the wider documentation set as the mechanism that provides complete back-to-birth records for parts and verification of their condition, quality and certification, with the EASA Form 1 and FAA Form 8130-3 as the critical documents for USM. Daniel Koehler listed the supporting layer alongside them: airworthiness release certificates, non-incident statements, shop visit reports and life-limited part logs.

For a buyer this converts into a simple sequencing rule. If the part is life-limited, the back-to-birth file is a condition of the purchase order, not an item to chase after delivery. Once the unit has shipped, the leverage to obtain missing records is gone.

Why this stopped being a paperwork question

The AOG Technics case ended the argument that documentation risk is theoretical. On 24 February 2026 Southwark Crown Court sentenced Jose Alejandro Zamora Yrala, the company’s former director, to four years and eight months in prison; he had pleaded guilty in December 2025 to fraudulent trading. Between January 2019 and July 2023 the company sold more than 60,000 aircraft engine parts worth £6.9 million using falsified authorised release certificates, most of them intended for the CFM56 — the engine family that sits under a very large share of the 737 Classic and NG fleets still flying in Africa and South Asia.

What was falsified is the detail worth carrying into every purchase decision: authorised release certificates and shipment memos, altered on a home computer from genuine documents. The scheme did not defeat a rigorous verification process. It defeated buyers who read a document that looked right and never contacted the organisation named on it.

That is the practical lesson. A release certificate is a claim about what a named organisation did. Verification means confirming with that organisation — not confirming that the PDF is legible.

The buyer’s check before the money moves

A workable sequence for an operator or purchasing desk in an emerging market, in order:

1. Name the accepting authority first. Decide which regulator’s procedure the part must satisfy, and whether a foreign release is accepted directly or needs a conversion. Do this before requesting quotes, not after.

2. Ask for the file, not a photograph of the tag. The release certificate, the ATA 106 with both trace blocks completed, the removal or teardown record, and for life-limited items the back-to-birth history and current cycle status.

3. Read the status line, not the headline. A form releasing an item as inspected or tested is not an overhaul, and the price should reflect which one you are buying. The same discipline applies when comparing an outright purchase against an exchange, which we set out in the guide to exchange versus outright for ageing fleets.

4. Contact the organisation named on the release. Independently, using contact details you found yourself. This is the single step the AOG Technics buyers skipped.

5. Hold the payment until the file clears. Documentation review belongs before funds are released, not after. On Aviatrading every transaction runs through escrow and sellers are verified, so the money stays protected while the paperwork is checked — which is exactly the sequence a cross-border USM purchase needs.

Sourcing with the file in mind

USM traceability is not an obstacle placed between a buyer and a part. It is the only thing separating a serviceable unit from an expensive paperweight that a quality manager will reject on arrival. The operators who source USM well are not the ones with the best supplier list — they are the ones who specify the documentation in the request, verify it independently, and pay only when it holds up.

If you are sourcing used serviceable material for an ageing fleet, you can submit an RFQ with your documentation requirements stated up front or search current stock in the aviation parts catalogue. New requests are posted to the live requests channel as they come in.