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FAA Legal Interpretations: What They Are and Why Every Pilot Should Know Them

Learn what FAA Chief Counsel legal interpretation letters are, how they affect pilots, and which notable interpretations every pilot should know. Includes how to search them on FARAIM.US.

April 2026·7 min read read·Faraim Editorial

KEY POINT

FAA legal interpretations are official letters from the FAA's Chief Counsel that clarify how regulations apply to specific situations. They're legally significant and often surprising — here's what every pilot needs to know.

The FAA's regulations don't cover every possible situation. When pilots, attorneys, or aviation organizations need clarification on how a specific regulation applies to a specific scenario, they can request a formal legal interpretation from the FAA's Office of the Chief Counsel. These letters become part of the FAA's official interpretive record.

What Is an FAA Legal Interpretation?

A legal interpretation is a formal written response from the FAA Chief Counsel's office that explains how a specific regulation applies to a described scenario. They are not regulations themselves, but they carry significant legal weight — courts and administrative law judges give them substantial deference.

More than 600 legal interpretation letters have been issued, dating back to the 1970s. They cover everything from logging PIC time to drone operations, alcohol rules, passenger carriage, and maintenance requirements.

Why Legal Interpretations Matter to Pilots

The FAA can use a legal interpretation as the basis for certificate action — meaning a pilot could lose their certificate for a violation that isn't explicitly spelled out in the regulations but was addressed in a Chief Counsel letter. Inspectors and DPEs also use interpretations to inform their enforcement and testing decisions.

Notable Legal Interpretations Every Pilot Should Know

Logging PIC Time as Safety Pilot (Simmons, 2011)

When two instrument-rated pilots share a flight — one under the hood, one acting as safety pilot — the Simmons interpretation clarified that only one pilot can log PIC at a time. The pilot under the hood logs PIC as 'sole manipulator of controls.' The safety pilot may log PIC only if they are designated PIC for the flight before departure.

BasicMed and the Driver's License Requirement

Multiple interpretations have confirmed that a pilot flying under BasicMed must possess a valid US driver's license at the time of the flight. If your license is expired, suspended, or revoked, you cannot exercise BasicMed privileges — even if your CMEC is current.

Sport Pilot and Alcohol/Drug History

The FAA has interpreted that a sport pilot using a driver's license as their medical authorization cannot fly if they know or have reason to know they have a disqualifying medical condition — including alcohol dependence that would otherwise disqualify them from a medical certificate.

Flight Instructor Currency for Endorsements

A CFI whose flight instructor certificate has expired cannot issue endorsements. This seems obvious, but interpretations have clarified this applies even if the CFI is otherwise current on all other certificates.

Drone Operations in Class G Below 400 Feet

The FAA has interpreted that even in uncontrolled Class G airspace, Part 107 operators must comply with airspace restrictions in their area. Flying near airports in Class G still requires authorization if within the radius defined by the FAA.

How to Search FAA Legal Interpretations

The FAA publishes all legal interpretations at its legal interpretation database online. However, the search function is limited and the raw text can be difficult to parse. FARAIM.US has indexed all 600+ interpretation letters alongside the regulations, AIM, and handbooks — so you can search in plain English and get a cited answer that references the specific letter and its date.

Try asking FARAIM.US: 'Can a safety pilot log PIC time?' or 'What does the Simmons interpretation say about logging instrument time?' You'll get a direct answer with the exact Chief Counsel letter cited.