Mechanic's Liens: When a Shop Keeps Your Plane

Yes, in almost every state a repair shop can legally keep your airplane until you pay the bill. That power is called a mechanic's lien on an aircraft (you will also hear it called an artisan's lien, a repairman's lien or a possessory lien), and it comes from state law rather than from anything the FAA wrote. It works the way a dry cleaner's ticket works: the shop did the work, the shop has the goods, and the shop does not have to hand them over until the money changes hands.

What follows is the checklist version of that problem. How to read the paperwork you already signed, how to audit a bill line by line, what the shop can and cannot do with your logbooks, and the four realistic ways people actually get their airplane off that ramp. None of this is legal advice, and lien statutes differ meaningfully from state to state, so treat it as the map rather than the route.

Start With the Paperwork You Already Signed

Almost every billing fight is decided by a document that was signed months earlier and never read. Before you argue about the number at the bottom of the invoice, find out what you authorized. In most states a shop's lien only covers work that was authorized, so the scope of your authorization is the whole ballgame.

• The work order. Good: a signed, dated document naming the aircraft by N-number and serial, describing the job, and listing a labor rate. Bad: a phone call, a text message that says "go ahead," or a work order you never saw a copy of.
• The estimate and the not-to-exceed figure. Good: a written estimate with a dollar ceiling and language saying the shop will call you before passing it. Bad: an "open" annual with no cap, which is how a $4,000 inspection becomes a $31,000 invoice.
• Discrepancy authorizations. Good: each squawk found during the inspection written up separately, priced, and approved by you in writing or email before the wrench turned. Bad: a single lump line item reading "repairs as required."
• The fine print on the back. Good: you know what it says about storage charges, interest on past-due balances, parts markup and the shop's lien rights, because you read it. Bad: you discover the 1.5 percent monthly finance charge and the $45-a-day hangar fee at the moment you dispute the bill.
• Who signed. Good: the registered owner or someone with written authority. Bad: a partner, a pilot friend or a flight school manager who committed your airplane without your consent. That gets complicated fast, and it is worth knowing in advance how your airplane is titled.

Heads Up: Finding an airworthiness problem during an annual inspection does not automatically authorize a shop to repair it or charge for the repair. Whether additional work is billable depends on the work order, any later authorization, and applicable state contract and lien laws. An inspector can document discrepancies and withhold approval for return to service without performing every repair. If you authorized inspection only, ask the shop to explain the contractual or legal basis for any additional charges.

Understand What Your State's Lien Actually Gives the Shop

Aircraft repair liens are governed primarily by state law, and the rules vary. Texas addresses aircraft repair and maintenance liens in Chapter 70 of its Property Code, while Florida has aircraft-specific provisions in Chapter 329. Other states use broader laws covering repairs to personal property. At the federal level, 49 U.S.C. Section 44108 addresses the validity of certain aircraft ownership and security documents. The FAA Aircraft Registry can record qualifying mechanic's liens when the applicable state law allows recording, but it does not decide whether a disputed maintenance bill is justified.

• Possession and recording. Some aircraft mechanic's liens allow a shop to retain possession until payment, while others can remain enforceable after the aircraft is released. Texas, for example, permits a qualifying lienholder to retain the aircraft and provides limited rights to retake possession after release. Florida allows qualifying aircraft liens to be perfected by recording a notice within 90 days, without requiring continued possession. Never assume that getting your airplane back automatically clears a lien. Check the applicable state law and obtain a written release when settling the claim.
• Scope. Good: the lien covers the labor, parts and reasonable storage tied to this repair. Bad: a shop trying to hold your airplane for an unpaid balance on a different aircraft, a different year, or your buddy's engine overhaul.
• Notice requirements. Good: you receive a written notice of lien naming the amount claimed and the statutory deadline. Bad: silence, followed later by a claim that notice was mailed to an address you have not used since 2019.
• Foreclosure sale. Good: you know the statutory notice period in your state before a lien sale can happen, which in many states runs thirty days or more and requires notice to recorded lienholders. Bad: assuming nobody will ever actually sell a $180,000 airplane over a $22,000 bill. It happens.
• Your bank. Good: you call your lender first, because almost every aircraft loan requires you to keep the aircraft free of competing liens. Bad: letting the lender find out from the shop's foreclosure notice, which can trip a default clause in your note.

If your airplane is financed, the dispute is no longer only between you and the shop. Lenders have a strong interest in getting a possessory lien cleared and sometimes pay it to protect their collateral, then add it to your balance. That is rarely the cheap outcome. Our guide to aircraft financing options and lender terms covers the covenants that make this an issue.

Audit the Bill Line by Line

A disputed invoice is usually not wrong everywhere. It is wrong in two or three places, and finding those places is what gets the number down. Ask for a detailed breakdown rather than a summary. A shop that will not produce one is telling you something.

• The labor rate. Good: the rate on the invoice matches the rate on the work order. As of 2025 and into 2026, piston general aviation shops commonly post roughly $100 to $175 an hour, with turbine-capable Part 145 facilities and high-cost metro areas running higher. Bad: a rate that appeared out of nowhere, or a mid-job increase applied retroactively.
• The hours. Good: hours that track a published flat-rate or labor-guide figure for the task, or a technician time log you can inspect. Bad: 14 hours to change a vacuum pump, or round numbers on every single line.
• Duplicated access time. Good: the shop opened the belly once and did all three jobs while it was open. Bad: full access labor billed separately for three items that live under the same inspection panel.
• Parts and markup. Good: part numbers, trace documentation, and a markup you were told about up front, commonly somewhere in the 15 to 35 percent range at GA shops. Bad: "parts" as a single number, or new-part pricing on something that turned out to be serviceable or "as removed" condition hardware.
• Shop supplies, hazmat and environmental fees. Good: a disclosed percentage of labor, usually small and capped. Bad: an uncapped percentage you are seeing for the first time.
• Storage. Good: no hangar charges during the time the shop was waiting on its own back-ordered part. Bad: daily storage accruing for the entire two months the airplane sat waiting on a cylinder, plus more accruing while you argue.
• Rework. Good: no charge for taking apart something the shop assembled incorrectly. Bad: being billed twice for the same job under two different line items.

Pro Tip: Ask for the technician time tickets, not the invoice summary. Most shops record labor against a job number by the tenth of an hour. The tickets will either back up the invoice or quietly explain the gap, and asking for them signals that you intend to be specific rather than just loud.

Flying411 keeps aircraft listings, ownership guides and maintenance explainers in one place, so you can compare what an airplane costs to buy against what it realistically costs to keep flying.

Your Logbooks and the Entries You Are Owed

This is where owners get angriest, and where the rules are clearest. Maintenance records are your responsibility under 14 CFR 91.417, and an airplane without them is worth dramatically less — something covered in our piece on how maintenance records affect resale value. A shop holding records hostage is a separate problem from a shop holding the airplane.

• The required entry for work performed. Good: 14 CFR 43.9 entries for the maintenance that was actually completed and approved for return to service, signed and dated. Bad: completed work with no entry, which leaves you unable to prove it was ever done.
• The inspection entry. Good: if an annual or 100-hour was performed, 14 CFR 43.11 requires either an approval for return to service or a signed, dated list of the discrepancies given to the owner. A disapproval is still a legal entry. Our explainer on what happens when an IA will not sign your annual walks through that. Bad: an inspector who refuses to write anything at all.
• Major repairs and alterations. Good: a completed FAA Form 337 with your copy in hand, as described in our Form 337 guide. Bad: major work with no 337 filed, which becomes the next buyer's problem and therefore yours.
• Repair station copies. Good: a Part 145 repair station retains its own maintenance records and furnishes you a copy of the maintenance release under 14 CFR 145.219. Bad: a shop claiming the only copy of anything is in its filing cabinet.
• Your own backup. Good: you photographed or scanned every logbook page before you dropped the airplane off. Bad: original and only copies sitting in a shop you are now suing. The habits in our logbook verification guide are worth adopting as an owner, not just as a buyer.

Why It Matters: Lost or withheld records can take five to fifteen percent off a used airplane's value, and no amount of later paperwork fully replaces a missing decade. Scanning your books costs an afternoon. Reconstructing them costs real money and never quite works. The FAA's current recordkeeping guidance lives in Advisory Circular 43-9D, which we covered when it replaced AC 43-9C.

Getting the Airplane Back

There are four normal paths out of a lien standoff, and one that will make everything worse. Pick early, because storage charges and the shop's legal fees usually keep running while you decide.

• Pay under protest, then challenge the bill. In some disputes, paying the claimed amount while clearly reserving your rights may be the quickest way to recover the aircraft and pursue a refund afterward. However, writing "paid under protest" on a check does not guarantee that every claim remains available. State law, settlement language and the circumstances of payment can affect your rights. Before paying a substantial disputed bill, consider getting legal advice and documenting the disagreement in writing. Obtain a receipt and written lien release, and confirm how the payment affects any future claim.
• Negotiate a partial payment and release. Good: you agree on a number, both sides sign a short settlement with a lien release and a statement that the records are returned complete. Bad: a handshake, or a payment made before the release is signed.
• Bond around the lien. Good: many state statutes let an owner post a bond — often one and a half to two times the claimed amount — which transfers the lien from the aircraft to the bond and gets the airplane released while the fight continues. Bad: not knowing this exists, which is common, because almost nobody mentions it.
• Litigate while the shop holds the airplane. Good: appropriate when the disputed amount is large and the shop's claim is weak. Bad: six months of tiedown exposure, dead batteries, corroding cylinders and an airplane you cannot show a buyer.
• Self-help. Do not. Taking your airplane off a shop's ramp while a valid lien is in force can be charged as theft or sued as conversion, and if the annual is not signed off, the airplane is not airworthy anyway. If a ferry flight is genuinely needed later, there is a legal route — see how to get a special flight permit.

Keep in Mind: Time is almost never on the owner's side. The shop has your collateral, your records and a hangar that bills by the day. Every week you spend building the perfect argument is a week of storage charges added to the number you are arguing about.

Flying411 keeps model guides, inspection checklists and cost breakdowns in one place, so you can compare shops and airplanes with the same information a seasoned owner would use.

Keeping It From Happening Again

The owners who never end up in this situation are not luckier. They set the terms before the airplane went in the hangar door, the same way you would agree on a price before a contractor started tearing up your kitchen.

• Cap the authorization. Good: "Inspect only. Do not perform repairs. Call me with the discrepancy list and prices." Bad: dropping it off for an open annual with no ceiling.
• Get the rate sheet in writing. Good: hourly rate, shop supply percentage, parts markup policy, storage policy, all on one page you keep. Bad: "about a hundred and something an hour, I think."
• Approve squawks in email. Good: a written trail with dates and dollar figures for every added item. Bad: approving a $9,000 cylinder job on a cell phone call from a hotel lobby.
• Ask for progress billing. Good: invoices every two weeks on long jobs, so a surprise is a $3,000 surprise and not a $30,000 one. Bad: radio silence for nine weeks.
• Keep the originals. Good: provide copies of logbooks where possible, scan everything first, and sign a short receipt listing exactly which books you handed over. Bad: three original logbooks and a stack of 337s dropped on a counter with no record.
• Know your own airplane's open items. Good: you track recurring airworthiness directives and life-limited parts yourself, so nothing on the invoice is a shock. Bad: discovering a $12,000 AD compliance item on the bill.
• Check the shop first. Good: two or three references from owners of similar aircraft, plus a type club's recommendation. Bad: the closest hangar with an open slot.

Good to Know: If an airplane has been sitting while a dispute runs, the condition problems start stacking up quickly — flat-spotted tires, corroded cylinders, dead batteries, seized brake pistons. Our guide on what to inspect when an airplane has sat for a year applies just as well to one that sat for four months behind a locked hangar door.

The Checklist at a Glance

Before You Sign

Walk away from a shop before the work begins if it will not put a labor rate and a not-to-exceed figure in writing, will not give you a copy of the work order, or gets defensive when you ask how it handles discovered discrepancies. Those three questions cost nothing to ask and sort shops faster than any review site. A good shop answers them in under a minute because it answers them every week.

Get a lawyer involved when the disputed amount passes roughly five figures, when the shop sends a formal notice of lien or foreclosure, when your logbooks are being withheld, or when a lender is threatening default. Aviation lien statutes carry deadlines, and missing one can cost you rights you did not know you had. For smaller amounts, paying under protest and filing in small claims is usually faster and cheaper than any attorney you could hire. A second opinion from another IA on whether the work was necessary and competently done is worth its cost either way, and if the shop is still holding the airplane, an independent inspection before you fly it home is money well spent.

The honest summary is this: an aircraft mechanic's lien is strong, it is legal, and it is enforced the way the law of your state says it is — but it is only as broad as the work you authorized and the amount that is genuinely reasonable. Owners who keep written authorizations, scan their logbooks and read the back of the work order almost never have this fight. Owners who do not have it once, and then never again.

Flying411 keeps buying guides, maintenance explainers and current listings in one place, so you can compare aircraft and the real cost of owning them side by side.

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