FAA Aircraft Annual Inspection: What Part 91 Owners Must Know
Meta description: FAA aircraft annual inspection explained: what it covers, who can perform it, how to prepare, and what the sign-off actually certifies legally.
Every 12 calendar months, your aircraft needs an annual inspection or it doesn’t fly legally. Simple rule, but the details matter — who can sign it off, what they’re actually certifying, how to avoid surprises, and what happens when something fails. Get any of this wrong and you’re either grounded or, worse, flying an aircraft that isn’t legally airworthy. This guide covers what Part 91 private owners need to know to keep their aircraft legal and the inspection process efficient.
What the Annual Inspection Covers — and What It Certifies
The annual inspection is defined in 14 CFR §43.11 and Appendix D to Part 43. It’s a comprehensive examination of your aircraft’s airframe, engine, propeller, and all installed components and systems. The scope is specific: the inspector must check for conformity to type design and determine whether the aircraft is in condition for safe operation.
Appendix D lists the minimum inspection items. For the airframe, this includes fuselage and hull surfaces, flight control systems, landing gear, cockpit and cabin components, engine mounts, and all structural elements. For powerplant, it covers the engine, exhaust, controls, fuel and oil systems, ignition, and accessories. Propellers get their own section covering blades, hubs, governors, and anti-ice components.
Here’s what the annual inspection sign-off actually certifies: per §43.11, the IA (Inspection Authorization holder) is certifying that the required inspection was performed and the aircraft was found airworthy — or was not found airworthy, in which case it must be listed as such.
Critical point: the signature does not mean the FAA has certified or approved anything. The FAA issues the type certificate and airworthiness certificate. The IA’s role is to inspect and attest. The legal responsibility for maintaining airworthiness sits with you, the owner, under §91.403(a). The IA certifies the inspection occurred and documents the findings. That’s it.
Who Can Perform the Annual: A&P IA Aircraft Inspection Authority
Not every mechanic can sign off an annual inspection. This is where many owners get confused.
An A&P (Airframe and Powerplant) certificated mechanic can perform maintenance, preventive maintenance, and alterations. But to perform and sign off an annual inspection, you need either:
1. A mechanic holding an Inspection Authorization (IA) under 14 CFR §65.91
2. A manufacturer with a repair station certificate
3. The aircraft manufacturer if they hold appropriate authority
For most Part 91 owners, option one is the path: an A&P with IA authorization.
The IA is issued by the FAA to experienced A&Ps who meet specific requirements: at least three years of certificated experience, current active engagement in maintenance, and completion of an IA refresher within the prior two years. The IA authorizes them to perform annual inspections, approve aircraft for return to service after major repairs or alterations, and perform the 100-hour inspection.
You can hire an A&P without IA status to assist with the inspection — removing panels, cleaning, even diagnosing issues — but only the IA can approve the aircraft for return to service after the annual.
When selecting an IA, look for experience with your aircraft type. A Bonanza specialist will inspect a Bonanza more thoroughly than a generalist unfamiliar with the type-specific AD history and known failure modes.
How to Prepare Your Aircraft and Logbooks
Preparation is where you save money and reduce downtime. Show up unprepared and you’re paying shop rates while someone searches through a box of loose papers.
Logbook organization: Bring complete, organized maintenance records. This means airframe, engine, and propeller logbooks, plus any separate avionics logs. The IA needs to verify AD (Airworthiness Directive) compliance, life-limited component status, and previous inspection history. If you have digital records through a platform like Squawkd, export a complete summary. If you’re working from paper, tab the relevant entries.
AD compliance list: Compile a current list of all applicable ADs with compliance status. This is your responsibility as owner under §91.403. Don’t make the IA hunt for it. Include one-time ADs with compliance dates and recurring ADs with next-due information.
Aircraft preparation: Arrive with the aircraft clean. Seriously. Inspectors can’t see corrosion through grime. Remove interior panels if you’re able and willing — this can save an hour or more of shop time. Drain the sumps the night before so any water contamination is evident. Top off the oil so the inspector can verify oil consumption trends.
Document known issues: If you know the right brake is weak or there’s a minor oil seep at the prop governor, tell the IA upfront. Surprises during inspection cost more than honest disclosure beforehand.
Bring the aircraft’s equipment list and weight-and-balance data. The inspector needs to verify installed equipment matches documentation.
What Commonly Gets Flagged
Experienced IAs see the same issues repeatedly. Knowing these patterns helps you anticipate problems.
Airworthiness Directive non-compliance: Either missed entirely or improperly documented. The AD was done but the logbook entry doesn’t include all required information — AD number, revision, method of compliance, date.
Exhaust system cracks: Common on legacy aircraft. Inspect before the annual if you can; exhaust repairs take time and parts.
Control cable wear and pulley issues: Often found at fairleads and turnbuckles. Cables fray where they bend.
Corrosion: Particularly in battery boxes, around fuel tank fittings, and on steel components in coastal environments.
Worn brake linings and leaking brake cylinders: Frequently deferred during the year but flagged at annual.
Instrument markings: Faded or missing range markings on airspeed indicators, tachometers, manifold pressure gauges. Minor to fix but commonly noted.
ELT battery expiration: The 406 MHz ELT battery has a replacement date. If it’s due within the next year, some IAs flag it.
Seat track and stop condition: After several fatal accidents traced to seat slippage, inspectors scrutinize seat rail stops and locking mechanisms.
Paperwork deficiencies: Weight and balance not updated after equipment changes. Missing 337 forms for previous alterations. Incomplete log entries.
Annual vs. 100-Hour Inspection: Understanding the Difference
The annual and the 100-hour inspection are identical in scope. Same checklist, same Appendix D requirements, same level of scrutiny. The difference is when each is required and who can sign it off.
Annual inspection: Required every 12 calendar months for all aircraft under Part 91 (with limited exceptions for special categories). Can only be performed and approved by an IA, certified repair station, or manufacturer.
100-hour inspection: Required only when the aircraft is operated for hire — flight instruction for hire, or carrying passengers or property for compensation. The 100-hour requirement sits on top of the annual requirement; it doesn’t replace it. An A&P without IA authorization can perform the 100-hour inspection.
If you use your aircraft exclusively for personal transportation under Part 91, you have no 100-hour requirement. Annual only. If you rent your aircraft back to a flight school or provide any for-hire operations, you need both.
One efficiency note: if a 100-hour inspection is due and performed by an IA, they can sign it off as an annual, resetting the 12-month clock. This avoids duplicative inspections.
Return to Airworthy: What Happens When a Squawk Is Found
When the inspection reveals a discrepancy, the aircraft is not airworthy until that item is corrected. The process is straightforward but must be documented properly.
The IA cannot sign off the annual until all discrepancies are resolved or the owner chooses to leave items uncorrected. If you decline repairs, the IA must provide a signed, dated list of discrepancies. The aircraft cannot return to service until those items are addressed and signed off.
For items that can be corrected: the repair or replacement is performed, then documented in the maintenance record with a return-to-service entry per §43.9. Only after all items are resolved can the IA make the annual inspection entry in the maintenance record.
That entry must include: the type of inspection, the date, aircraft total time, the signature of the person approving the return to service, and their certificate type and number.
If a major repair is required during the inspection — not just minor maintenance — a separate FAA Form 337 may be required. The IA determines whether the repair qualifies as major per Part 43 Appendix A.
How Squawkd Helps
Squawkd keeps your AD compliance status, component life tracking, and complete maintenance history in one place. When annual inspection time comes, you can generate a full maintenance summary that gives your IA exactly what they need to verify compliance quickly — no digging through boxes of paper.
Frequently Asked Questions
Q: Does a signed-off annual inspection mean the FAA has certified my aircraft is airworthy?
No. The FAA issued your original airworthiness certificate when the aircraft was manufactured or imported. The annual inspection sign-off is the IA’s attestation that they performed the required inspection and found the aircraft in airworthy condition at that time. Continued airworthiness remains your responsibility as the owner under §91.403. The FAA does not review or approve annual inspection results.
Q: Can I fly my aircraft to an IA for the annual inspection if it’s already overdue?
Yes, with limitations. Under §91.409(e), you may operate an aircraft to a location where the inspection can be performed, but you cannot carry passengers and the flight must be the most direct route practical. This is sometimes called a “ferry permit” informally, though no formal permit is required for this specific situation.
Q: What happens if my IA finds something during the annual but I can’t afford the repair right now?
The IA cannot sign off the annual with known unairworthy conditions. Your options: complete the repair, have the IA provide a written list of discrepancies (the aircraft remains grounded until resolved), or in some cases, obtain a special flight permit under §21.197 to ferry the aircraft to a facility that can complete the work. Deferring required repairs indefinitely is not an option if you want to fly legally.
Tags: Part 91 annual inspection, A&P IA aircraft inspection, aircraft airworthiness FAA, annual inspection preparation, AD compliance, FAA maintenance requirements, return to service
Regulatory context: FAA
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