A hydraulic actuator is cut out of a DC-10 that will never fly again. Eighteen months later the same actuator is bolted into an airliner carrying three hundred people, and everything about that is legal.

The thing that makes it legal is a single sheet of paper, roughly A4, printed in a layout that has not changed in a decade: FAA Form 8130-3, the Authorized Release Certificate, universally known in the trade as the 8130-3 tag. It is the document that turns a lump of metal with a history into an article a mechanic can lawfully fit.

It is also the most widely misunderstood document in the aircraft parts business, and the misunderstanding is printed in small type at the bottom of the form itself, where almost nobody reads it. In September 2025 the FAA pulled the whole thing apart and rebuilt it, which is a good moment to explain what the tag actually certifies — and what it very deliberately does not.

The form tells you itself, and nobody reads it

Look at the bottom third of any completed 8130-3 and you will find a box headed User/Installer Responsibilities. Its first line is the single most important sentence on the document.

The box goes on to spell out the consequence: “Statements in Blocks 13a and 14a do not constitute installation certification. In all cases, aircraft maintenance records must contain an installation certification issued in accordance with the national regulations by the user/installer before the aircraft may be flown.”

In other words, the tag certifies the article’s condition and its approval status at the moment it left the organisation that signed the form. Eligibility for a particular aircraft is a separate question, answered by a separate person, in a separate record. A mechanic who fits a tagged part and files the tag has done half the job. The other half is the installation entry.

The FAA says the same thing in its own guidance, twice over and in almost identical words. Order 8130.21J: the form “does not constitute approval to install the item on a particular aircraft, aircraft engine, or propeller but helps the end user determine the item’s airworthiness approval status.” Advisory Circular 43-9D, at paragraph 23.2.1: “FAA Form 8130-3 return to service does not constitute approval to install a product or article on a particular aircraft, aircraft engine, or propeller.”

Three documents, one message, and a parts market that still largely treats the tag as a passport.

One form, two completely different jobs

The reason the 8130-3 is confusing is that it is not one document. It is two, sharing a layout.

Down the left-hand side of the signature area sit blocks 13a to 13e. That half is the production release: a new article leaving a factory, certified as conforming to approved design data and in a condition for safe operation. It is issued under Part 21, by an FAA inspector, an FAA-authorised designee, an ODA unit member, or a production approval holder operating an approved quality system.

Down the right-hand side sit blocks 14a to 14e. That half is the maintenance release: an article that has been repaired, overhauled, inspected or modified, and is being approved for return to service under 14 CFR 43.9. It is issued by a mechanic, a repairman, a Part 145 repair station, or a Part 121 or 135 certificate holder.

A used actuator out of a teardown carries a right-hand-side release. A brand-new actuator from the manufacturer carries a left-hand-side one. The form is the same; almost nothing else about the two situations is. Order 8130.21J is explicit that you may not mix them, listing among the things the form cannot be used for “release of a mixture of production- and maintenance-released aircraft engines, propellers, or articles on the same FAA Form 8130-3.”

The FAA’s own briefing on the 8130.21J reorganisation, posted to the agency’s YouTube channel.

How 74 pages became 18

For twelve years the instructions for completing the form lived in FAA Order 8130.21H, issued on 1 August 2013 and amended by Change 1 on 11 January 2016. With that change folded in it ran to seventy-four pages and nineteen worked examples of the completed form.

In March 2025 the FAA put a draft replacement out for comment, and the aviation parts industry opened it to find eighteen pages.

Dickstein also recorded what he called an obvious fear: that language added over the years to fix specific past problems might have been quietly dropped along with the page count. The Aviation Suppliers Association asked for an extension to the comment period, got one through 6 June 2025, and filed comments saying the draft would need further work and flagging what it believed were unintentional errors.

The final order, signed on 25 September 2025, is still eighteen pages. But the missing material did not vanish. It moved house, and the move is stated outright in paragraph 1.1 of the new advisory circular.

Three days before the new Order was signed, AC 43-9D had appeared carrying the maintenance half of the instructions. It also, at last, replaced AC 43-9C, the maintenance-records circular that an industry coalition had told the FAA in June 2017 was “not current” and failed to address the requirements of 43.9. The coalition had submitted a complete rewrite and asked the agency not to publish its own draft as written. Eight years later, the rewrite arrived.

So the 2025 reorganisation is not a cut. It is a split, and arguably the right one: the people who fill in the left-hand side of the form and the people who fill in the right-hand side now each have a document written for them.

Original, recurrent, and the moment a new part stops being new

One distinction in the new Order deserves more attention than it gets, because it is the hinge on which the whole used-parts trade swings.

Order 8130.21J draws a line between an original and a recurrent airworthiness approval. The first issue of an 8130-3 counts as original when it covers new articles produced by a production approval holder that are still inside that holder’s Part 21 quality system. Once the article has been released from that system, a further 8130-3 may be issued only after somebody has determined that it has not suffered damage or degradation affecting its airworthiness and that it remains airworthy. That second issue is a recurrent approval.

It sounds like bookkeeping. In practice it is the rule that governs a part sitting on a distributor’s shelf for four years, a part that has crossed three borders, and a part found in a crate during an inventory. The Order is specific about what the inspection has to establish for a used article: that it has not been damaged nor suffered noticeable degradation, such as degraded seals or o-rings, since the approval for return to service was issued. And where the part is sealed in packaging that cannot be opened for inspection, the authorised person must obtain objective evidence that the right inspections were done before signing.

The trace is not the tag

Ask a lessor what keeps them awake about used serviceable material and they will not say the 8130-3. They will say the trace.

The tag is a snapshot. It records a condition and an approval on one date, signed by one organisation. What a buyer actually needs is the history behind it, and for one category of part that history is a legal requirement rather than a commercial preference.

Section 43.10 of the regulations deals with life-limited parts, defined as any part for which a mandatory replacement limit is specified in the type design, the Instructions for Continued Airworthiness or the maintenance manual. Remove one from a type-certificated product and you must control it by one of seven listed methods: a record-keeping system substantiating part number, serial number and current life status; a tag or record attached to the part; non-permanent marking; permanent marking; segregation with physical separation from eligible parts; mutilation; or another method the FAA accepts.

Two of those are worth dwelling on. Mutilation, under 43.10(c)(6), “must render the part beyond repair and incapable of being reworked to appear to be airworthy” — a sentence that tells you exactly what problem the rule was written to solve. And 43.10(d) is the clause that makes trace travel: anyone who removes a life-limited part and later sells or transfers it must transfer the mark, tag or other record with it, unless the part was mutilated first.

That is the regulatory skeleton under what the industry calls back-to-birth traceability: an unbroken documentary chain from manufacture to the present, cycle by cycle. For a life-limited rotating part in an engine, a gap in that chain is not a discount. It is the end of the part’s useful life, because nobody can prove how much of it is left.

C&L Aviation Group walks through the condition codes a buyer meets alongside the tag: new, overhauled, serviceable, as-removed and the rest.

The European half, and the single form that does both

Europe issues its own version, the EASA Form 1, Authorised Release Certificate. The layout is deliberately near-identical, and for good reason: for most of the last two decades the two authorities have been working to make one piece of paper do both jobs.

The mechanism is the dual release, and AC 43-9D sets out exactly how it works. Aviation authorities in the EU recognise an 8130-3 for approval for return to service only from Part 145 repair stations or air carriers that also hold an EASA Part-145 approval and were rated for that article at the time. When the form is used to meet the terms of the Maintenance Annex Guidance under the Bilateral Aviation Safety Agreement, it becomes a dual release, and the article is then eligible for installation on a US- or EU-registered aircraft.

Mechanically it comes down to two ticked boxes and a sentence. Both boxes in block 14a are checked — “14 CFR 43.9 Return to Service” and “Other regulation specified in Block 12” — and block 12 carries a prescribed statement citing the shop’s EASA Part-145 approval number. Only facilities holding both approvals, and located in the United States or an EU member state, may do it. Everyone else issues two separate forms.

The aeroplanes with no tags at all

Everything above assumes a type-certificated aircraft inside the civil system. A sizeable and noisy part of the fleet is not.

For ex-military aircraft that hold a civil type certificate — issued under 14 CFR 21.27 for surplus aircraft of the Armed Forces, or 21.25 for the restricted category — the regulations contain a clause written specifically for them. Section 21.9(c) says that a person may not sell or represent an article as suitable for installation on such an aircraft unless the article was declared surplus by the US Armed Forces and was intended by them for use on that model. The parts supply for a warbird is, in other words, legally tied to the military stock it came from.

For the larger group of ex-military jets flying on experimental exhibition certificates, there is no type certificate at all. An L-39 Albatros on the US register usually sits in that category, and Part 43 does not reach it: 43.1(b)(1) excludes aircraft holding an experimental airworthiness certificate. What governs the aircraft are the operating limitations issued with that certificate, and what governs its parts is whatever the maintenance programme written for that specific airframe says. There is no Appendix A list and frequently no 8130-3 to be found. Owners of these aircraft build their own trace, from military records, overhaul shops and whatever documentation survived the type’s service career.

ODA training on the issuance of FAA Form 8130-3, aimed at the inspection unit members who actually sign them.

What the tag is worth

Strip away the mythology and the 8130-3 is a narrow, precise instrument. It says: on this date, this organisation, which the FAA has authorised to say so, found this article to conform to approved design data and to be in a condition for safe operation, or found it fit to be returned to service after the work described in block 11.

It does not say the part fits your aeroplane. It does not say the part is new. It does not say where the part has been. It is not a shipping document, and the Order says so in as many words. The questions a buyer actually cares about — eligibility, history, remaining life — are answered by the installation record, the trace file and the life-status record, none of which are the tag.

Which brings it back to the actuator from the DC-10. The tag is what makes it saleable. The paperwork behind the tag is what makes it worth buying. And the entry a mechanic makes on the day it goes into the aircraft is what makes it legal to fly.

Sources: FAA Order 8130.21J, Completion of FAA Form 8130-3 under Part 21, 25 September 2025; FAA Advisory Circular 43-9D, Maintenance Records and FAA Form 8130-3 Return to Service, 22 September 2025, editorially updated 30 April 2026; FAA Order 8130.21H with Change 1, 11 January 2016; 14 CFR 21.9, 21.25, 21.27, 21.325, 21.331 and 21.335, and 14 CFR 43.1, 43.9 and 43.10, as published on eCFR; Jason Dickstein, Aviation Suppliers Association, 21 March and 7 June 2025; Aeronautical Repair Station Association, on the 2017 industry rewrite of AC 43-9C.