Aircraft Recordkeeping Requirements: An Owner’s Compliance Guide

Aircraft owner reviewing maintenance log

U.S. aircraft owners and operators must maintain maintenance records, inspection logs, AD compliance evidence, time-in-service data, and alteration records — and every return-to-service entry must contain the five elements specified in 14 CFR §43.9. That single regulation, read alongside 14 CFR Part 91 (particularly §91.417) and 14 CFR Part 43, defines your legal obligations as an owner or operator. FAA Advisory Circular AC 43-9D translates those regulations into practical guidance on what “intelligible” and “continuous” records actually look like. Digital platforms like Squawkfree can help you maintain that continuity automatically.

Your immediate next step: Pull your last three return-to-service entries and verify each one contains all five required elements before you read another section.

Quick retention highlights:

Temporary records (routine maintenance, 100-hour inspections): retain until the work is repeated or superseded, or for one year after completion, whichever comes first.
Permanent records (total time-in-service, major alterations, AD compliance status, life-limited part records): retain and transfer with the aircraft at sale; do not discard these.
Form 337 (major repair or alteration): one copy goes to the FAA; the other must be retained with the aircraft records and transfer with the aircraft at sale.

The legal test for any maintenance record is not its format — it is whether the record is intelligible and provides unbroken continuity of the aircraft’s maintenance history. AC 43-9D makes clear that paper and digital formats are equally acceptable, provided those two conditions are met.

Pro Tip: Validate your last three return-to-service entries right now. Check for: (1) description of work, (2) date of completion, (3) name of person performing the work if different from the approving person, (4) signature and certificate number, and (5) kind of certificate held. A missing certificate number is the most common deficiency found during FAA ramp checks.

Which FAA regulations actually control aircraft recordkeeping?
What records do you actually need to keep?
How do you write a legally valid maintenance entry?
How long do you keep records, and what transfers at sale?
What documents must be on the aircraft during flight?
How do you document AD compliance correctly?
Are digital records acceptable, and how do you set them up correctly?
What mistakes do owners make, and how do you prepare for an inspection?
Key Takeaways
The part of recordkeeping most owners underestimate
Squawkfree keeps your records audit-ready, automatically
Useful sources

Which FAA regulations actually control aircraft recordkeeping?

Four primary sources govern aviation documentation standards for U.S. general aviation owners and operators. Understanding which rule applies to which situation keeps you from citing the wrong authority when an inspector asks a question.

Aircraft mechanic inspecting maintenance logs

Regulation / Document	Scope	Key Requirement
14 CFR Part 43	Persons performing maintenance	Governs who may perform maintenance and what entry must be made; §43.9 specifies required entry elements
14 CFR §91.417	Aircraft owners and operators	Requires owners to keep maintenance records and sets retention periods and transfer obligations
14 CFR §91.203	All civil aircraft operations	Lists documents that must be aboard the aircraft during flight (airworthiness cert, registration, operating limitations)
14 CFR §135.63	Part 135 certificate holders	Adds crew records, load manifests, and aircraft availability lists; pilot records kept at least 12 months
FAA AC 43-9D	All operators (advisory)	Explains intelligibility, acceptable record formats, Form 8130-3 handling, and record continuity

Infographic of FAA aircraft recordkeeping rules

Part 43 is the mechanic’s rule; Part 91 is the owner’s rule. A certificated mechanic or repair station creates the entry under Part 43. You, as the owner or operator, are responsible under Part 91 for keeping that record and making it available for FAA inspection.

AC 43-9D is not a regulation, but it carries significant practical weight. It explains what the FAA considers an acceptable record format, clarifies the meaning of “intelligible,” and describes how Form 8130-3 fits into the return-to-service chain. When an inspector questions whether a digital record is acceptable, AC 43-9D is the document you cite.

For operators running Part 121 or Part 125 programs, additional continuous airworthiness maintenance program (CAMP) requirements apply under those parts. The §43.9 entry requirements still apply, but the disposition and program oversight rules are more detailed. Part 135 operators must also comply with §135.63 for crew and aircraft records, which adds retention obligations beyond what §91.417 requires for GA owners.

What records do you actually need to keep?

Section 91.417 lists the records every owner or operator must maintain. Organizing them by component — airframe, engine, propeller, appliance — is a widely adopted industry practice that simplifies sales, overhauls, and component traceability, even though the regulation does not require separate physical logbooks.

Records required under §91.417(a)(1) — retain until work is repeated, superseded, or for one year:

Records of maintenance, preventive maintenance, and alterations
Records of 100-hour, annual, progressive, and other required inspections
Current status of applicable airworthiness directives (ADs), including method of compliance and next-due date for recurring ADs

Records required under §91.417(a)(2) — must transfer with the aircraft at sale:

Total time-in-service for the airframe, each engine, and each propeller
Current status of life-limited parts for each airframe, engine, propeller, rotor, and appliance
Time since last overhaul of all items required to be overhauled on a specified time basis
Current inspection status of the aircraft, including the time since the last inspection under an approved inspection program
Current AD status, including method of compliance
Copies of FAA Form 337 for major repairs and major alterations

Additional records to maintain separately:

FAA Form 8130-3 copies (Airworthiness Approval Tag) for parts installed by persons authorized under §43.7(b); retain until superseded or for one year
Altimeter and transponder test records under §§91.411 and 91.413 (24-month interval tests; retain for two years)
Life-limited part tracking records per §43.10, including part number, serial number, and current life status

Keeping airframe, engine, and propeller logs as separate documents is the cleanest approach for transfers. When an engine is pulled for overhaul or sold separately, its records travel with it — not buried in a combined logbook that stays with the airframe.

How do you write a legally valid maintenance entry?

A signed work order from a shop is not automatically a compliant maintenance record. A work order that omits required §43.9 elements can render an entry legally insufficient for return to service, even if the physical work was performed correctly. Here is how to structure every entry so it holds up.

Step-by-step entry structure:

Description of work performed. Write a clear description or reference acceptable data (e.g., “Replaced left main gear tire per Cessna AMM Chapter 32-40-00, P/N XXXXXX”). A reference to the maintenance manual section is acceptable; a vague phrase like “gear work” is not.
Date of completion. Record the calendar date the work was completed, not the date it was started.
Name of the person performing the work (if different from the approving person). If the same person performed and approved, this field is satisfied by the signature in step 4.
Signature, certificate number, and kind of certificate. The approving person signs, prints their FAA certificate number, and identifies the certificate type (e.g., “A&P,” “IA,” “Repair Station Certificate No. XXXXXK”).
For major repairs and major alterations: complete FAA Form 337 per Appendix B of Part 43. One copy goes to the local FAA Flight Standards District Office (FSDO) within 48 hours; you retain the other permanently with the aircraft records.
For Form 8130-3 situations: attach or reference the traceable Form 8130-3 copy in the maintenance record entry. The form number and issuing person’s certificate number should appear in the logbook entry.

Annotated sample entry:

Date: March 14, 2025                          ← Element 2: date of completion
Work performed: Annual inspection completed
per 14 CFR Part 43 Appendix D. Aircraft found
airworthy. Oil changed, filter cut and inspected
(no metal), magneto timing verified per Lycoming
SI 1009AS. See attached work order #2025-047
for full discrepancy list.                    ← Element 1: description / reference to data
Performed by: J. Smith                        ← Element 3: name if different from approver
Approved for return to service:
Signature: [signature]
Certificate No.: 1234567                      ← Element 4a: certificate number
Kind of certificate: A&P/IA                   ← Element 4b: kind of certificate

A signed work order attached to the logbook does not replace a logbook entry. The entry in the aircraft’s maintenance record must stand on its own. Attaching a work order as supporting documentation is good practice, but the logbook entry itself must contain all five §43.9 elements — the work order is a supplement, not a substitute.

Pro Tip: When referencing a service bulletin or airworthiness directive in an entry, include the document number, revision letter, and date (e.g., “Complied with AD 2019-23-15, Rev. 1, dated November 12, 2019, by replacing fuel cap seal per SB-1234”). That one line satisfies both the description requirement and the AD compliance documentation requirement simultaneously.

How long do you keep records, and what transfers at sale?

The retention rules under §91.417(b) split into two categories, and confusing them is one of the most common compliance errors owners make.

Temporary records (§91.417(a)(1) items): retain until the work is repeated or superseded, or for one year after the work is performed, whichever comes first. Routine oil changes, 100-hour inspections, and minor repairs fall here. Once a new annual inspection supersedes the previous one, the old entry can technically be discarded — though most owners and buyers prefer a complete history.

Permanent records (§91.417(a)(2) items): these never expire and must transfer with the aircraft at sale or permanent transfer. There is no “one year” option for total time-in-service, AD compliance status, life-limited part records, or Form 337 major alteration documents.

Transfer checklist for aircraft sale:

Airframe logbook with total time-in-service and current inspection status
Engine logbook(s) with time since new, time since overhaul, and AD compliance entries
Propeller logbook(s) with time since overhaul and AD status
All FAA Form 337s for major repairs and major alterations
Life-limited part records with current life status for each tracked component
AD compliance list showing AD number, revision date, method of compliance, and next-due date for recurring ADs
Any FAA Form 8130-3 copies traceable to installed parts

Two special cases worth noting:

Altimeter and static system tests (§91.411) and transponder tests (§91.413) must be performed every 24 calendar months for IFR operations. The records for these tests are retained for two years, which overlaps with both the temporary and permanent categories depending on how your digital system tags them.
If you operate under a progressive inspection program, the current status of that program transfers with the aircraft.

In a digital recordkeeping system, tag permanent records as immutable at the time of entry. Accidental purging of Form 337s or life-limited part records during a routine cleanup is a real risk when permanent and temporary records share the same folder or database without retention categories.

What documents must be on the aircraft during flight?

Section 91.203 and related guidance require four documents to be aboard every civil aircraft during flight. Inspectors at ramp checks ask for these first.

Document	CFR Reference	Notes
Airworthiness certificate	§91.203(a)(1)	Must be displayed at the cabin or cockpit entrance; original required
Aircraft registration certificate	§91.203(a)(2)	Original or pink copy acceptable; must be current
Operating limitations	§91.203(b)	POH/AFM, placards, instrument markings, or a combination — all must be present
Weight and balance data	—	Current W&B report reflecting actual aircraft configuration

A few additions apply in specific situations. If your aircraft has a major alteration that changed operating limitations, the applicable Form 337 (or a copy) must be accessible to show the revised limits. Aircraft with experimental or special airworthiness certificates carry their operating limitations as a separate document issued by the FAA, not a standard POH.

On the paper-versus-digital question for onboard documents: the FAA currently requires the airworthiness certificate and registration to be the original documents (or FAA-issued copies). A photo on your iPad does not satisfy the requirement for those two. Operating limitations and weight and balance data may be carried as printed copies of current documents, provided they reflect the aircraft’s actual configuration.

How do you document AD compliance correctly?

AD compliance documentation is the area where owners most often create gaps that surface during pre-buy inspections or FAA audits. Section 91.417(a)(2)(v) requires you to maintain the current AD status, the method of compliance, the AD number and revision date, and the next-due date or interval for recurring ADs.

Step-by-step AD entry structure:

AD number and revision. Write the full AD number and revision letter (e.g., “AD 2021-14-08, Amendment 39-21658”).
Compliance date and aircraft time. Record the calendar date and the aircraft/engine total time at compliance.
Method of compliance. Specify exactly how you complied: “Replaced fuel selector valve per AD instructions, P/N XXXXXX installed” or “Inspected per AD alternative method of compliance (AMOC) No. 2021-ANM-123.”
Next-due information for recurring ADs. State the next-due date or interval clearly: “Repeat inspection required every 100 hours TIS; next due at 2,347.5 hours TIS.”

One-time AD entry example:

AD 2019-23-15, Rev. 1 (Amendment 39-21234) — Complied March 14, 2025, at 2,247.5 hours TIS. Replaced fuel cap assembly per AD instructions, P/N 0763000-1 installed. No further action required (terminating action).

Recurring AD entry example:

AD 2018-05-09, Rev. 0 (Amendment 39-19456) — Complied March 14, 2025, at 2,247.5 hours TIS. Inspected crankshaft per Lycoming MSB 632C. No cracks found. Repeat inspection required every 400 hours TIS; next due at 2,647.5 hours TIS.

Common errors and their consequences:

Missing method of compliance: an inspector cannot confirm the AD was addressed correctly without knowing how. This can result in a finding that the AD is not in compliance.
Missing revision date: ADs are revised; citing the wrong revision can mean you complied with superseded instructions.
No next-due entry for recurring ADs: without a documented next-due date, the AD will be missed on the next maintenance cycle, potentially grounding the aircraft.
Relying on a shop’s work order alone: if the shop’s work order doesn’t make it into the aircraft’s maintenance record with all required elements, the compliance is undocumented from the FAA’s perspective.

Schedule recurring AD checks in your maintenance planning system with a buffer before the due date. A 10-hour or 30-day advance alert gives you time to schedule the work without an AOG situation.

Are digital records acceptable, and how do you set them up correctly?

The FAA’s position, as explained in AC 43-9D, is format-agnostic. Paper and digital records are equally acceptable, provided the records are intelligible and maintain continuity. That two-part test is the entire legal standard.

“Intelligible” means a person with appropriate aviation knowledge can read the record and understand what work was done, when, and by whom. “Continuity” means there are no unexplained gaps in the maintenance history. A digital system that loses entries, overwrites signatures, or fails to preserve the original scan of a handwritten logbook page fails both tests.

Best-practice checklist for digitizing legacy paper logs:

Use human-verified OCR, not automated OCR alone. Technical shorthand, ATA system codes, and handwritten certificate numbers are routinely misread by automated systems, producing records that are unintelligible under AC 43-9D standards.
Preserve images of original pages alongside the transcribed text. The image is the legal original; the transcription is the searchable index.
Tag each entry with a retention category (permanent or temporary) at the time of digitization, not retroactively.
Verify that signatures are legible in the scanned image. A blurred or cropped signature can make an entry legally insufficient.
Store the original paper logbooks even after digitization until you have confirmed the digital record is complete and verified.

Comparing record storage approaches:

Approach	Compliance Strengths	Practical Risks
Paper logbooks only	Original signatures preserved; no technology dependency	Physical loss, fire, water damage; no automated AD alerts; manual time-in-service tracking
Basic scanned PDF storage	Low cost; images preserved	No metadata tagging; no retention categories; no automated continuity checks; OCR errors undetected
Human-verified digital platform	Continuity enforced; retention categories; automated flight-hour import; AD tracking integrated	Requires subscription; data migration from paper takes time

Industry standards like ATA iSpec 2200 define structured data formats for maintenance records and aircraft transfers, including AD status, life-limited part lists, and installed-part records in XML. While these standards are primarily used by airlines and OEMs, the underlying principle — structured, tagged, transferable data — applies directly to GA digital recordkeeping.

Squawkfree’s Flight Intelligence feature auto-imports flight hours from ADS-B data, eliminating manual tach-hour entry and the transcription errors that come with it. Its human-verified logbook digitization service applies OCR plus human review to legacy paper logs, preserving original page images and tagging entries by retention category. AD tracking is built into the platform, so recurring AD due dates surface automatically rather than requiring manual calendar management.

Pro Tip: Set up two separate archive locations for your digital records: one active cloud storage with role-based access, and one immutable backup that cannot be edited or deleted without a separate authorization step. This prevents accidental purging of permanent records during routine file cleanup — a surprisingly common cause of compliance gaps.

What mistakes do owners make, and how do you prepare for an inspection?

Most compliance failures in aircraft records are not the result of work that wasn’t done — they are the result of work that wasn’t documented correctly. The distinction matters because an undocumented repair is, from the FAA’s perspective, an unperformed repair.

Pre-inspection routine (20–30 minutes):

Start with the AD compliance list. Verify that every applicable AD has an entry showing the AD number, revision, method of compliance, and next-due date. Cross-reference the list against the FAA’s AD database to confirm you haven’t missed a new AD issued since your last review. Next, pull the last three return-to-service entries and check each one for all five §43.9 elements. Then confirm that your Form 337s are present for every major alteration in the aircraft’s history. Finally, verify that the four required onboard documents are current and physically present in the aircraft.

The most common deficiencies found during this routine: missing certificate numbers in older entries, illegible signatures on scanned pages, AD entries that show compliance but omit the method, and Form 337s that were submitted to the FSDO but never retained in the aircraft records.

Red flags that will trigger follow-up or grounding: an entry signed but with no certificate number; an AD listed as “complied” with no method of compliance noted; a major alteration with no Form 337; a gap in the maintenance history of more than 12 months with no explanation; and life-limited part records that show accumulated time but no part number or serial number.

Remediation steps for common issues:

If you find an incomplete entry, you cannot alter the original. The correct approach is to make a new supplemental entry that references the original date and work, provides the missing information, and explains the correction. Have the original approving mechanic sign the supplemental entry if possible.

If you need a traceable Form 8130-3 copy for a part that was installed without one, contact the repair station or manufacturer that performed the work. They are required to retain records and can often provide a copy. If the original issuer is no longer available, document your search effort and consult your local FSDO for guidance.

When an entry is so illegible that it cannot be interpreted, a certificated mechanic or IA can make a new entry based on available evidence (shop records, invoices, logbook context) and note the basis for the entry. This is not falsification — it is reconstruction with documented sourcing, and it restores intelligibility under AC 43-9D.

Key Takeaways

FAA aircraft recordkeeping requirements come down to two rules: keep the right records, and make sure every maintenance entry contains the five elements specified in 14 CFR §43.9 — because a missing certificate number or illegible signature can ground an airworthy aircraft.

Point	Details
Five required entry elements	Every return-to-service entry must include description, date, name (if different), signature, certificate number, and kind of certificate per §43.9.
Two retention categories	Temporary records (routine maintenance) are kept for one year or until superseded; permanent records (total time, ADs, Form 337s) transfer with the aircraft at sale.
AD documentation specifics	Each AD entry must show the AD number, revision date, method of compliance, and next-due date for recurring ADs per §91.417(a)(2)(v).
Digital records are acceptable	AC 43-9D confirms format is the owner’s choice; the legal test is intelligibility and record continuity, not paper versus digital.
Squawkfree for continuity	Squawkfree auto-imports flight hours, tracks AD due dates, and provides human-verified logbook digitization to maintain FAA-compliant record continuity.

The part of recordkeeping most owners underestimate

Most owners treat their aircraft logbooks as a historical archive — something you pull out for a pre-buy or an annual, then put back in the flight bag. That framing creates the compliance gaps that show up at the worst possible moments.

The more useful mental model is to treat the maintenance record as a living legal document. Every flight hour that accumulates without a corresponding time-in-service update is a gap. Every AD that comes due without a documented compliance entry is a potential grounding event. Every return-to-service entry that lacks a certificate number is a deficiency that could, in a worst-case scenario, be interpreted as an unauthorized maintenance action.

What changes when you adopt that model? You stop treating record updates as an administrative task that happens after the real work. The entry becomes part of the work. A mechanic who hands you back a logbook with an incomplete entry hasn’t finished the job — and you, as the owner, are the one legally responsible for the record under §91.417.

The practical habits that make this manageable: verify each return-to-service entry before the mechanic leaves the hangar. Keep a running AD compliance list that you update every time a new AD is issued for your aircraft type. Separate your permanent records from your temporary ones, physically or digitally, so a routine cleanup never touches a Form 337. And if your logbooks are paper, digitize them with human verification before they become illegible — faded ink and water damage are not force majeure events from the FAA’s perspective.

The owners who sail through ramp checks and pre-buy inspections are not the ones with the most expensive aircraft or the most recent avionics. They are the ones who treat recordkeeping as a continuous discipline, not a periodic scramble.

Squawkfree keeps your records audit-ready, automatically

Staying current with FAA aircraft recordkeeping requirements takes consistent attention across maintenance entries, AD tracking, and time-in-service logging. Squawkfree maps directly to those obligations: Flight Intelligence auto-imports flight hours from ADS-B, keeping your time-in-service records current without manual entry. The built-in AD tracking system alerts you before recurring ADs come due, so you schedule the work rather than discover the gap. Per-aircraft cloud storage keeps airframe, engine, and propeller records organized and accessible, with retention categories that protect permanent records from accidental deletion.

Squawkfree

For owners with paper logbooks, Squawkfree’s logbook digitization service combines OCR with human verification to produce a complete, intelligible digital record that meets AC 43-9D continuity standards. Start your 60-day free trial at squawkfree.com and see how the platform maps to your specific compliance obligations.

This article is published by Squawkfree. It is general informational guidance, not legal or regulatory advice. Confirm current rules with the applicable CFR sections, FAA advisory circulars, or a certificated aviation professional for your specific situation.

Useful sources

Source	What it covers	Recommended use
14 CFR §43.9 (LII)	Exact required elements for maintenance record entries; Form 337 disposition	Primary reference for entry drafting and compliance checks
14 CFR §91.417 (eCFR)	Owner/operator record retention requirements and transfer obligations	Retention schedule and sale/transfer checklist
AC 43-9D (FAA Safety)	Intelligibility, record continuity, Form 8130-3 handling, acceptable formats	Practical interpretation of §43.9 and §91.417; digital records guidance
14 CFR §135.63 (LII)	Part 135 certificate holder recordkeeping: crew records, load manifests, aircraft lists	Applicable to Part 135 operators; crew record retention minimums
ATA iSpec 2200 (A4A Publications)	Industry standard for structured maintenance data and electronic aircraft transfer records	Reference for structured digital recordkeeping and AD/LLP data exchange

Download and keep in your records folder: AC 43-9D (the practical guide to compliant entries), the current text of §91.417 (your retention obligations), and a blank FAA Form 337 (for major repair and alteration documentation). These three documents answer the majority of questions that arise during an annual inspection or pre-buy review.

Aircraft Recordkeeping Requirements: An Owner's Compliance Guide