14 CFR § 91.409
Inspections
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What does 14 CFR § 91.409 require?
14 CFR 91.409 is THE general-aviation inspection-cadence rule. Every Part 91 aircraft must have an annual inspection within the preceding 12 calendar months — performed and signed by an A&P mechanic holding an Inspection Authorization (IA) or by an FAA-approved Part 145 repair station. A 100-hour inspection is additionally required only when the aircraft is carrying persons for hire OR being used for flight instruction for hire; the 100-hour and annual are independent cadences (a fresh annual does NOT zero out the 100-hour tach counter). §91.409(c) carves out turbine-powered, experimental, light-sport, and progressive-inspection aircraft. Progressive inspection programs under §91.409(d) require FAA approval, qualified personnel, a current written manual, and §43.11 logbook entries at each inspection segment. §91.409(f) lets operators of certain large airplanes, turbojets, turboprops, and fractional aircraft elect among four alternative inspection programs (continuous airworthiness, approved aircraft inspection program, current Part 121/135 program, or a current manufacturer-recommended inspection program).
Regulation text (summary)
No person may operate an aircraft unless, within the preceding 12 calendar months, it has had an annual inspection in accordance with Part 43 and has been approved for return to service by a person authorized by §43.7. Aircraft carrying any person (other than a crewmember) for hire, or given for flight instruction for hire, must also have received a 100-hour inspection within the preceding 100 hours of time in service. §91.409(c) exempts turbine-powered, experimental, light-sport, and aircraft with current progressive inspection programs from the annual / 100-hour structure. §91.409(d) governs FAA-approved progressive inspection programs; §91.409(f) provides alternative inspection program elections for certain large airplanes, turbojets, turboprops, and fractional ownership aircraft.
Read full regulation at eCFR.govWho must comply with 14 CFR § 91.409?
All operators of Part 91 aircraft — private, business, recreational, corporate flight departments — except where §91.409(c) exemptions apply (turbine-powered, experimental, LSA, current progressive program). Part 91 Subpart F large + turbine multi-engine operators may elect the alternative programs under §91.409(f). Part 135 commercial operators normally follow their FAA-approved Part 135 Subpart J maintenance program in lieu of §91.409 directly, but cross-reference §91.409 standards. Part 121 air carriers follow their own continuous airworthiness program under Part 121 Subpart L.
What happens if you violate 14 CFR § 91.409?
FAA civil penalties typically $1,500–$25,000 for operator violations of overdue annual or 100-hour inspections; higher for repeated, willful, or commercial-operation violations. Airman certificate suspension or revocation possible for the PIC who operates the unairworthy aircraft. Insurance coverage is commonly void on a flight with an overdue inspection — large post-accident civil exposure. Overdue inspections are among the top 10 most-cited Part 91 enforcement actions tracked in the FAA Enforcement Information System.
Penalty range
Annual citations
YoY penalty trend
How to comply (implementation checklist)
- 1Track the annual inspection due date as the last day of the 12th calendar month after the most recent annual sign-off; calendar-quarterly reminders 60 + 30 + 7 days out.
- 2If the aircraft carries persons for hire OR is used for flight instruction for hire, track tach / time-in-service against the 100-hour threshold and schedule the next inspection before reaching 100 hours; the 10-hour overrun allowance under §91.409(b) is only for traveling to a place where the inspection can be done.
- 3Subscribe to FAA Airworthiness Directive (AD) email notifications and reconcile every applicable AD at each annual + 100-hour inspection (§91.403 / §91.405 require AD compliance to remain airworthy).
- 4Maintain §43.11 logbook entries (date, total time in service, kind of inspection, signature, certificate number, IA expiration if applicable) for every annual + 100-hour + progressive inspection segment.
- 5Coordinate IA renewal cadence with your A&P-IA — IAs renew March 31 each year per §65.93 + require recent inspection activity OR refresher course; a lapsed IA cannot sign your annual.
- 6If electing a §91.409(d) progressive program, file the written request with the local FSDO well before the next annual due date and confirm written FAA approval before the existing annual expires.
- 7For used-aircraft purchases, treat the pre-buy inspection as a §91.409-style annual scope inspection (12 calendar months back-look + AD reconciliation + §43.11 logbook review) even if a current annual is on the books.
Common misinterpretations
- Misinterpretation: 'Annual inspection is good for 12 months from the day it was signed off.' Reality: §91.409(a)(1) reads 'within the preceding 12 calendar months' — same end-of-month convention as §135.293. An annual signed on March 8, 2026 is valid through March 31, 2027 (the end of the 12th calendar month), not through March 8, 2027.
- Misinterpretation: '100-hour inspection resets the annual clock (or vice versa).' Reality: They are independent cadences. The 100-hour is hours-based + only required when carrying persons for hire OR for flight instruction for hire. The annual is calendar-based + required for ALL Part 91 aircraft. A fresh annual does NOT zero the 100-hour tach time and a 100-hour does NOT extend the annual due date.
- Misinterpretation: 'Progressive inspection is just splitting the annual into segments — no FAA paperwork needed.' Reality: §91.409(d) requires (1) a written request to the FAA, (2) FAA approval of the program, (3) qualified personnel (certificated mechanic with IA, certificated repair station, or aircraft manufacturer), (4) a current inspection procedures manual on hand, (5) inspection cards or routing, AND (6) §43.11 logbook entries documenting each progressive segment.
- Misinterpretation: 'The owner can sign off the annual inspection as long as they hold an A&P.' Reality: §91.409(a)(1) cross-references Part 43 — the annual must be performed AND approved for return to service by a mechanic holding an Inspection Authorization (IA) per 14 CFR §65.91, OR by an FAA-approved repair station, OR by the aircraft manufacturer. An A&P without IA cannot sign off an annual. Owners may perform preventive maintenance under §43.3(g) + Appendix A, but not annuals.
Real enforcement examples
Anonymized from public FMCSA enforcement summaries. Penalty amounts reflect assessed and final settled values where disclosed.
Part 91 private operator was ramp-checked at a Class B reliever airport in 2024 and FSDO inspectors found the most recent annual inspection logbook entry dated 14 months earlier. Operator received a $9,500 FAA civil penalty for operating an aircraft in non-compliance with §91.409(a)(1) plus a 30-day airman certificate suspension. The flight insurance carrier separately denied coverage on a hangar-rash incident that occurred while the annual was overdue, leading to ~$22,000 in uncovered repair cost.
Source: FAA Enforcement Decision Process summaries, anonymized; consistent with FAA Compliance + Enforcement Program reporting in FAA Order 2150.3C
How FileFlo handles 14 CFR § 91.409
FileFlo's compliance rule-pack FAA-14CFR91.409 automatically checks every document you upload against this regulation. Auto-detects document type, parses key fields, sets renewal alerts, and surfaces this section in your audit binder if a gap is found.
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Frequently asked questions
What's the difference between an annual inspection and a 100-hour inspection under §91.409?▾
Annual inspections (§91.409(a)(1)) are required for ALL Part 91 aircraft and are calendar-based — every 12 calendar months. 100-hour inspections (§91.409(b)) are hours-based and are required only when the aircraft is carrying any person (other than a crewmember) for hire OR being used for flight instruction for hire. The two cadences run independently — a fresh annual does NOT reset the 100-hour tach time, and a 100-hour does NOT extend the annual due date. Many flight schools and rental fleets satisfy both: they perform an inspection of annual scope every 100 hours, log it as an annual, and that single event covers both requirements until the next 100-hour or 12-calendar-month milestone, whichever comes first.
Who is legally allowed to sign off an annual inspection?▾
Per §91.409(a)(1) cross-referenced to 14 CFR §43.7, only three categories of person can approve an annual inspection for return to service: (1) an A&P mechanic holding a current Inspection Authorization (IA) under §65.91, (2) an FAA-approved Part 145 repair station with the appropriate ratings, OR (3) the aircraft manufacturer. An A&P without an IA can perform maintenance, but cannot sign off the annual. The owner can perform preventive maintenance under §43.3(g) + Part 43 Appendix A, but not an annual inspection.
What does 'within the preceding 12 calendar months' actually mean for the annual due date?▾
The same end-of-month convention used throughout Part 91 and Part 135. If the most recent annual inspection was signed off on March 8, 2026, the inspection is valid through March 31, 2027 — the last day of the 12th calendar month. The aircraft is unairworthy under §91.409 starting April 1, 2027. There is a narrow §91.409(b) 10-hour allowance for 100-hour inspections (only for travel to a place where the inspection can be done), but there is no comparable overrun grace period for the annual.
Which aircraft are exempt from the annual / 100-hour structure under §91.409(c)?▾
Four categories are exempt from §91.409(a) + (b): (1) turbine-powered aircraft (turbojet + turboprop + turbofan) for which the owner elects an alternative program under §91.409(f), (2) aircraft operated under a current progressive inspection program approved under §91.409(d), (3) aircraft with experimental airworthiness certificates (operating limitations specify the inspection program), and (4) light-sport aircraft (operated per the manufacturer's maintenance + inspection procedures and §91.327). Note: experimental and LSA still require an annual condition inspection, just outside the §91.409(a) framework.
What does a §91.409(d) progressive inspection program require?▾
Six elements: (1) a written request submitted to the local FSDO, (2) FAA written approval of the program before it goes into effect, (3) qualified inspection personnel — A&P-IA, certificated repair station, OR the aircraft manufacturer, (4) a current written inspection procedures manual covering all components, (5) inspection cards or a routing system breaking the airframe into inspection segments, and (6) §43.11 logbook entries at each segment documenting date, time in service, kind of inspection, signature, and certificate number. The progressive program REPLACES the annual + 100-hour cadence — it does not run on top of it.
What happens if I fly with an overdue annual inspection?▾
Three layers of exposure. (1) FAA enforcement — civil penalty typically $1,500–$25,000 plus possible airman certificate suspension; overdue inspections are among the top 10 most-cited Part 91 ramp-check violations. (2) Insurance — most policies have a 'must be airworthy' clause that voids coverage on any flight with an overdue inspection; that voids coverage on incidents that occurred during the overdue period even if the underlying cause was unrelated. (3) Civil liability — in the event of an accident, an overdue inspection is direct evidence of negligence per se in plaintiffs' suits. The cheapest course is to ground the aircraft and schedule the inspection.
Related regulations
Sources + reviewer
Primary source: eCFR.gov — 14 CFR § 91.409
Reviewed by Chad Griffith (Founder + CEO, FileFlo) on