Federal Aviation Regulation Ninety-One Point Three, the Rule That Lets You Break the Rules, and What Pilot in Command Really Means When Everything Goes Sideways
FAR 91.3 makes the pilot in command the final authority and lets you deviate from any rule in an emergency - here's what that really means.
Federal Aviation Regulation 91.3 is three short paragraphs that define the entire philosophy of who is responsible for a flight. It establishes that the pilot in command (PIC) is directly responsible for, and the final authority as to, the operation of the aircraft, grants the authority to deviate from any rule in Part 91 during an in-flight emergency, and requires a written report only if the FAA specifically asks for one. Understanding this rule changes how you handle pressure, emergencies, and your own decision-making in the cockpit.
What does FAR 91.3 actually say?
FAR 91.3 is titled “Responsibility and authority of the pilot in command,” and it has three parts - (a), (b), and (c) - each doing something distinct. Together they add up to the whole framework for how flying works in the United States.
Most pilots can’t quote it, yet it may be the single most important regulation in the book. It’s worth reading the actual language of each paragraph, because the exact words carry real legal and practical weight.
What does “final authority” mean for the pilot in command?
Paragraph (a) states: the pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft.
In plain English, everything that happens on the flight lands on you when you’re PIC. Not the controller, not your instructor in the right seat (unless you’ve clearly agreed otherwise), not the person who fueled the airplane, not dispatch. You.
That’s a lot of weight, and new pilots often feel it. But there’s a flip side worth internalizing: final authority is a gift. Nobody outside that cockpit gets to make you do something you believe is unsafe.
A controller can issue an instruction. Passengers can complain about being late. Your boss can tap his watch on the ramp. The regulation still says you are the final authority as to the operation of that aircraft.
How do I use my PIC authority when a controller pressures me?
Picture a night cross-country as a fresh private pilot. Tower clears you for the option, and on final you realize the wind has shifted into a gusting crosswind right at the edge of anything you’ve handled. Tower is busy, and there’s a jet behind you. Every instinct says just make it work.
FAR 91.3(a) is in your back pocket. You are the final authority. Here’s how to act on it:
- Key the mike and state your intentions clearly. Say “unable, request the other runway,” or “I need to go around and hold clear to the north.”
- Expect the controller to accommodate you. They know the rule too, and they will make it happen.
- Don’t trade safety for convenience. Your certificate doesn’t care whether you were convenient - it cares whether you were safe.
A useful phrase to repeat when pressure builds: “I’m the pilot in command. I decide.”
Can a pilot really break any rule in an emergency?
Yes. Paragraph (b) - the famous one - reads: in an in-flight emergency requiring immediate action, the pilot in command may deviate from any rule of this part to the extent required to meet that emergency.
Any rule in Part 91. You can bust an altitude, enter airspace you’re not cleared into, exceed a speed, or descend below minimum safe altitudes - whatever the emergency requires, to the extent it requires it.
This cuts two ways, and pilots get in trouble in both directions:
- Being too afraid to deviate. Some pilots let a bad situation get worse rather than break a rule. The FAA has already told you, in writing, to do what you need to do. Ice building and you need to descend into airspace without a clearance? Descend. Declare. Fly the airplane first. No regulation is worth dying to comply with.
- Treating (b) as a hall pass. The words “in-flight emergency requiring immediate action” matter. Running low on fuel because you planned poorly is not an engine failure. Scud running under a low ceiling to get home is a decision, not an emergency. Deviation authority kicks in when the situation genuinely forces your hand.
Paragraph (b) territory looks like this: engine failure, fire, a structural problem, a passenger’s medical emergency, or weather that closed in faster than any forecast predicted and demands an immediate descent.
Do I have to file paperwork after declaring an emergency?
Only if the FAA asks. Paragraph (c) states: each pilot in command who deviates from a rule under paragraph (b) shall, upon the request of the Administrator, send a written report of that deviation to the Administrator.
The key words are “upon request.” You do not automatically owe anyone a report the moment you declare an emergency. You owe a written report only if the FAA asks for one - and for a clean, well-handled emergency, they usually never will.
This kills a dangerous myth: the belief that declaring an emergency means guaranteed paperwork, a violation, and a lost certificate. That myth makes pilots sit on their hands when they should speak up.
The truth is the opposite. When you declare an emergency - using the word “emergency” or “mayday, mayday, mayday” - you are not confessing to a crime. You are activating the entire system on your behalf. Controllers clear airspace, stop worrying about your altitude and heading, ask souls on board and fuel remaining, roll the trucks, and give you any runway you want. FAR 91.3 is the legal foundation that makes all of that okay.
What does an examiner want to hear about 91.3 on a checkride?
When your checkride discussion turns to emergencies - and it will - the designated examiner wants to hear three things:
- You know you are the pilot in command.
- You understand you have the authority to deviate when safety requires it.
- You won’t let fear of paperwork stop you from doing the right thing.
The Airman Certification Standards, in the risk management sections, are looking for exactly this decision-making: recognizing when you’re the final authority and acting on it.
A real-world example: engine trouble near Class C airspace
Consider a pilot cruising along when the engine starts running rough - a partial power loss. There’s an airport off to the left, but it sits inside Class Charlie airspace, and the pilot hasn’t called approach, has no clearance, and doesn’t have the frequency dialed.
The old-myth pilot hesitates: “I can’t just fly in there, I’m not cleared.”
The 91.3 pilot acts:
- Turns toward the airport immediately.
- Keys up on any available frequency - guard, 121.5, if necessary - and transmits: “mayday, mayday, mayday, engine trouble, single engine airplane, ten miles north, inbound to land.”
- Flies the airplane to the runway. The clearance is irrelevant. The airspace is irrelevant.
The regulation says deviate to the extent required, and getting a sick airplane onto a runway is exactly what it was written for. Nobody’s filling out a report on that one - and if the Administrator does ask, the pilot writes a calm, honest paragraph describing what happened, and that’s the end of it.
The bigger picture
Beneath the legal language, FAR 91.3 is telling you something almost warm: we trust you. ATC can’t see what you see or feel what you feel, so when it counts, you decide, and the system will back your play as long as you were acting to keep people safe.
That trust is the whole trade. When you become a pilot, you accept the weight and earn the authority at the same time. Go read 91.3 for yourself - it takes about thirty seconds, and it may be the most valuable thirty seconds you spend this week.
Key Takeaways
- FAR 91.3 has three parts: (a) responsibility and final authority, (b) emergency deviation authority, and (c) a written report only upon request.
- As pilot in command, you are the final authority - no controller, passenger, or boss can compel you to do something unsafe.
- In a genuine in-flight emergency, you may deviate from any rule in Part 91 to the extent required to handle it.
- Deviation authority applies only to real emergencies requiring immediate action - not to poor planning or convenience.
- Declaring an emergency activates the system on your behalf; it is not an admission of guilt, and paperwork is required only if the FAA requests it.
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