If you own or fly a general aviation aircraft, your maintenance records are one of the most important things you will ever manage. They prove your aircraft is safe to fly. They protect its value. And here is something worth thinking about: the average single-engine piston aircraft flying in the U.S. today is over 52 years old. 

That means the plane may have changed hands multiple times, logged thousands of hours, and had dozens of mechanics work on it. The only way to know exactly what has been done to that aircraft is through its maintenance records.

Now, the FAA has officially updated the rules for how those records should be kept.

On September 22, 2025, the FAA issued AC 43-9D, the first major overhaul of its maintenance recordkeeping guidance since 1998. That is 27 years of the same document. A lot has changed in aviation since then, and the FAA's update reflects that. From new guidance on electronic records to clearer rules about who is responsible for what, this revision touches nearly every GA aircraft owner and pilot in the country.

So what does this mean for you? 

Key Takeaways

AC 43-9D is the FAA's updated guidance document for aircraft maintenance recordkeeping. It replaced AC 43-9C on September 22, 2025. The new version is longer, clearer, and adds important guidance on FAA Form 8130-3, electronic records, and owner/operator responsibilities. It is not a regulation, but following it is the best way to show the FAA you are doing things right. Aircraft owners, mechanics, and repair stations all need to understand what changed.

Key TakeawayDetail
New AC issuedAC 43-9D, effective September 22, 2025
ReplacedAC 43-9C (in use since June 8, 1998)
Who it affectsGA pilots, aircraft owners, A&P mechanics, repair stations
Biggest additionsFAA Form 8130-3 guidance, electronic records, Part 91 clarity
Companion documentAC 91-417 for Part 91 owner/operator recordkeeping
Is it a regulation?No, but it is the FAA's accepted standard
Key regulations referenced14 CFR Parts 43 and 91

 

What the AC Advisory Circular Document Means for Aircraft Maintenance

A lot of pilots hear the "FAA advisory circular" and assume it is a regulation they must follow. It is not, at least not in the traditional sense. An advisory circular is a guidance document. It tells you one acceptable way to comply with the actual regulations. You are allowed to use other methods, as long as they still meet the legal requirements.

Here is a simple example. The FAA regulation says you must keep maintenance records. The advisory circular tells you exactly how to do that in a way the FAA considers acceptable. You could technically do it differently, but if the FAA ever questions your records, you would need to prove your method meets the same standard. Most people find it much easier to just follow the AC.

The FAA issues advisory circulars in a numbered system that matches the structure of 14 CFR Part 43, the federal regulation covering aircraft maintenance. That is why this advisory circular is numbered 43-9. The "43" refers to Part 43, and the letter at the end tells you which version it is. "C" was the previous version. "D" is the new one.

Advisory circulars cover a wide range of topics across aviation. Some address pilot training. Others address aircraft design or airport operations. The ones in the "43" series are specifically about maintenance. And the 43-9 series has always focused on one thing: record-keeping requirements for general aviation aircraft.

Here is why that matters to you as a pilot or aircraft owner:

So while an advisory circular is not technically the law, it carries enormous practical weight. Following it is simply the smart move for any aircraft owner who wants to protect their investment and stay on the right side of the FAA.

AC 43-9C Maintenance Records: Document History and What Was Missing

Before we talk about what changed, it helps to understand what was there before. AC 43-9C was issued on June 8, 1998. At the time, it was a solid, practical document. It laid out acceptable methods for maintenance record-making and record-keeping under 14 CFR Parts 43 and 91. Mechanics and aircraft owners relied on it for nearly three decades.

In those 27 years, AC 43-9C received only two updates, and neither one was a major revision:

That was the extent of it. No major structural changes. No new guidance on digital tools. No updated guidance on FAA Form 8130-3 completion. No clearer separation between what mechanics are responsible for and what owners are responsible for.

For a long time, this was fine. But aviation kept moving forward. General aviation maintenance practices evolved. Digital logbooks became common. Electronic maintenance tracking software became widespread. Aircraft parts traceability became more complex. The global parts supply chain introduced new documentation requirements. And the gap between what AC 43-9C said and what the modern aviation world needed kept growing wider.

Here is what was missing in the old version:

Industry insiders noticed these gaps for years. The Aircraft Electronics Association pointed out that AC 43-9C had never fully addressed either regulatory requirement, Part 43 or Part 91, with the clarity pilots and mechanics needed. That sentiment was widely shared across the aviation community.

By the time the FAA began drafting a revision, the case for a major overhaul was already well established. Twenty-seven years is a long time in any industry. In aviation, it is a very long time.

Why the FAA Released a Revision to the AC 43-9C Document

The update did not happen overnight. The road to AC 43-9D was a multi-year process that included public comment periods, industry pushback, extended deadlines, and a significant amount of behind-the-scenes debate. Understanding this process helps you appreciate just how carefully the FAA and the aviation industry approached this revision.

The FAA released a draft of AC 43-9D in the summer of 2024 and opened it for public comment. This is standard practice. The FAA uses comment periods to gather feedback from pilots, mechanics, repair stations, manufacturers, and aviation organizations before finalizing a document.

But the draft was more complex than many expected. It introduced detailed guidance on completing FAA Form 8130-3 as part of a return to service record, something that had previously lived in a separate FAA order. It also tried to address both Part 43 and Part 91 responsibilities within a single document, which some industry leaders felt was confusing.

On August 9, 2024, eleven major aviation trade organizations sent a joint letter to the FAA requesting more time to review the proposed changes. The FAA responded quickly, extending the comment deadline to October 18, 2024. The organizations that signed the letter represented a wide cross-section of the aviation world, including:

Their concern was clear: the document contained changes that needed careful review to make sure guidance on parts 43 and 91 was accurate and aligned with existing bilateral agreements and maintenance providers practices.

The Aeronautical Repair Station Association took it a step further. In November 2024, ARSA submitted its own pair of alternative draft advisory circulars to the FAA. Their proposal was to split the document in two: one AC focused entirely on Part 43 requirements for maintenance providers, and a separate AC focused on Part 91 requirements for owners and operators. This idea ultimately influenced the final outcome. The FAA issued AC 43-9D alongside a companion document, AC 91-417, which handles the Part 91 side of recordkeeping.

The FAA finalized AC 43-9D and officially issued it on September 22, 2025. The non-compliance risks and practical implications of getting recordkeeping wrong were a driving force behind making this update as clear and thorough as possible.

 

 

 

 

AC 43-9D Aircraft Maintenance Records: Key Changes and Best Practices

editor-9181a84d9d2c0f262643f3de5de888b4.png

This is the section that matters most for your day-to-day life as a pilot or aircraft owner. The new FAA advisory circular is longer than its predecessor, 20 pages compared to the old 12, and it covers a lot of new ground. The revision took years of public comment, industry debate, and careful review to get right. The result is a document that fills in gaps that had been sitting in AC 43-9C for nearly three decades.

Here is a breakdown of every key change in AC 43-9D and what each one means for you.

 

 

 

FAA Form 8130-3 Return to Service Document: Now Built Into the AC

This is the biggest structural addition in the new advisory circular. FAA Form 8130-3, officially called the Authorized Release Certificate and Airworthiness Approval Tag, now has detailed completion guidance built directly into AC 43-9D. Before this revision, that guidance lived in a separate FAA order, which made it easy to overlook.

Here is why this matters:

If your mechanic swaps out a component and hands you a tag, that tag does not just sit in a folder somewhere. It is a legal part of your aircraft's permanent record. Treat it that way.

Electronic AC Maintenance Records: New Document Guidance and Compliance

For years, pilots and mechanics used digital tools to track maintenance, but the old guidance document said almost nothing about it. AC 43-9D fixes that with a brand new section on information systems and automation.

The key points:

Going digital is now a recognized option. But digital does not mean unregulated. Your system still needs to meet the same standards as a paper logbook.

AC 43-9D Advisory: Aircraft Owner or Operator Responsibilities Under Title 14

Here is a point that surprises a lot of GA pilots. Under 14 CFR Part 91, six specific items must be part of your maintenance records, and it is the owner or operator's responsibility to make sure they are there. Not your mechanic's. Yours.

The six required items under section 91.417(a)(2) are:

Your mechanic records the work performed. But you are responsible for maintaining the full picture of your aircraft's recordkeeping history. This distinction is one of the most important things AC 43-9D makes clear, and it is a point that many aircraft owners miss entirely. For a deeper look at your obligations as an owner, Aircraft Owner Maintenance Guide: What You Need to Know to Stay Compliant and Safe covers this topic in full detail.

How to Correct Aircraft Maintenance Records Under AC 43-9D Practice Guidelines

What happens if a logbook entry has an error? Before AC 43-9D, the answer was not clearly spelled out. Now it is.

This matters because errors in maintenance records happen. A mechanic might enter the wrong part number or leave out a required statement. Now there is a clear, defined path for fixing those mistakes without creating more confusion.

 

Preventive Maintenance Non-Compliance Risks for Aircraft Pilots Under AC 43-9D

AC 43-9D is specific about what private pilots can and cannot do when it comes to preventive maintenance.

This is a straightforward rule, but it is one that gets overlooked. If you change your own oil or replace a landing light, you need to log it properly. Skipping that step puts you at risk of non-compliance, even for something as routine as an oil change. And speaking of keeping your aircraft in top shape between maintenance visits, How Often Should You Run an Aircraft Engine to Stay Safe is worth a read before your next flight.

AC 91-417: The Companion Document for Part 91 Aircraft Maintenance Records

One of the most practical results of the industry comment process was the creation of a companion document. The FAA now has a separate advisory circular, AC 91-417, that focuses entirely on 14 CFR Part 91 recordkeeping for owners and operators.

This means:

The separation makes both documents easier to use. Mechanics and repair stations can focus on AC 43-9D. Owners and operators can focus on AC 91-417. Less overlap means less confusion.

Best Practices for Aircraft Records and Showing Compliance with AC 43-9D

General aviation maintenance recordkeeping is not complicated when you stay consistent. Following best practices under the new AC means staying ahead of these common mistakes:

Title 14 Code of Federal Regulations: The Regulatory Foundation Behind AC 43-9D

At its core, AC 43-9D exists to provide acceptable means of showing compliance with parts 43 and 91. It is guidance, not law. But it is the FAA's recognized standard for maintenance record-making and record-keeping, and following it closely is the simplest way to keep your airworthiness certificate valid.

The draft process was long. The industry debate was real. But the final product gives the general aviation maintenance community something it has needed for a long time: clear, modern, and practical recordkeeping guidance that reflects how aviation actually works today. Non-compliance with recordkeeping standards is one of the most avoidable problems in GA. AC 43-9D gives you every tool you need to get it right.

AC 43-9D and the Future of Aircraft Maintenance Record-Keeping

For 27 years, AC 43-9C was the go-to guide for aircraft maintenance records in general aviation. It did its job, but the aviation world changed, and the guidance needed to catch up. AC 43-9D is that update. It is clearer, more detailed, and better suited for how GA maintenance actually works today.

The biggest takeaways are simple. Electronic maintenance records are now officially recognized. FAA Form 8130-3 now has clear completion guidance inside the AC. And owners, not just mechanics, are responsible for making sure their aircraft records are complete and accurate. Clean records protect your airworthiness certificate, protect your aircraft's resale value, and keep you on the right side of the FAA.

If you want to stay ahead of FAA guidance changes, understand your responsibilities as an aircraft owner, or dig deeper into GA maintenance topics, head over to Flying411. There is a lot more where this came from.

Frequently Asked Questions About AC 43-9D Aircraft Maintenance Records

How Long Must an Owner or Operator Keep Aircraft Maintenance Records?

Under section 91.417, owners must keep records of inspections and ADs until the work is repeated, superseded, or the aircraft is sold. Records of total time in service, current inspection status, and AD compliance must be kept and transferred to the new owner when the aircraft is sold.

Can a Maintenance Provider Sign Off on Aircraft Records They Did Not Perform?

No. Under Part 43, only the person who actually performed or directly supervised the maintenance can make and sign the maintenance record entry. Signing off on work you did not perform or supervise is a serious violation that can result in certificate action.

Does the AC 43-9D Advisory Circular Apply to Experimental Aircraft?

AC 43-9D primarily applies to certificated aircraft maintained under 14 CFR Parts 43 and 91. Experimental amateur-built aircraft operate under different rules and are generally not subject to Part 43. Owners of experimental aircraft should refer to their operating limitations and relevant FAA guidance specific to their category.

What Is the Difference Between Major and Minor Repairs in Aircraft Maintenance Records?

Major repairs and major alterations require a completed FAA Form 337, which becomes a permanent part of the aircraft record. Minor repairs and alterations only require a standard logbook entry under section 43.9. The distinction between major and minor is defined in Part 43, Appendix A.

Are Electronic Logbook Apps Acceptable for Showing Compliance with AC 43-9D?

Digital logbook apps can be compliant if they meet the requirements of sections 43.9, 43.11, or 91.417 and follow the guidance in AC 120-78 for electronic signatures and recordkeeping. The key is that authorized signatures must still be captured in a verifiable way. Not all apps are built to meet these standards, so owners should verify compliance before relying solely on a digital system.