AIM ¶ 4-4-1 — ATC Clearance
AIM 4-4-1 explains what an ATC clearance is (and isn't), pilot authority under 91.3(a), and when to request an amended clearance. Study guide for checkride prep.
In Plain English
AIM 4-4-1 defines what an ATC clearance actually is — and just as importantly, what it is not. A clearance is an authorization by ATC for an aircraft to proceed under specified conditions within controlled airspace, issued to prevent collisions between known aircraft.
Key points every student pilot must understand:
- A clearance is NOT authorization to deviate from any FAR, regulation, or minimum altitude, nor to operate unsafely.
- Under 14 CFR 91.3(a), the pilot-in-command is the final authority for the operation of the aircraft.
- If a clearance would cause you to break a rule or jeopardize the flight, you must request an amended clearance.
- If you prefer a different action (a 360 for spacing, different runway, intersection vs. full-length departure, delay), tell ATC — but cooperate to avoid disrupting traffic flow.
- Always acknowledge clearances, frequency changes, and advisories using your full aircraft call sign.
- After a TCAS Resolution Advisory (RA) deviation, notify ATC as soon as possible.
- IFR traffic clearances provide separation only between IFR flights — when VMC, you must still see and avoid VFR traffic ATC may not know about.
AIM Source Text
FAA AIM ¶ 4-4-14-4-1. 4-4-1. Clearance
A clearance issued by ATC is predicated on known traffic and known physical airport conditions. An ATC clearance means an authorization by ATC, for the purpose of preventing collision between known aircraft, for an aircraft to proceed under specified conditions within controlled airspace. IT IS NOT AUTHORIZATION FOR A PILOT TO DEVIATE FROM ANY RULE, REGULATION, OR MINIMUM ALTITUDE NOR TO CONDUCT UNSAFE OPERATION OF THE AIRCRAFT. 14 CFR section 91.3(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.” If ATC issues a clearance that would cause a pilot to deviate from a rule or regulation, or in the pilot's opinion, would place the aircraft in jeopardy, IT IS THE PILOT'S RESPONSIBILITY TO REQUEST AN AMENDED CLEARANCE. Similarly, if a pilot prefers to follow a different course of action, such as make a 360 degree turn for spacing to follow traffic when established in a landing or approach sequence, land on a different runway, takeoff from a different intersection, takeoff from the threshold instead of an intersection, or delay operation, THE PILOT IS EXPECTED TO INFORM ATC ACCORDINGLY. When the pilot requests a different course of action, however, the pilot is expected to cooperate so as to preclude disruption of traffic flow or creation of conflicting patterns. The pilot is also expected to use the appropriate aircraft call sign to acknowledge all ATC clearances, frequency changes, or advisory information. Each pilot who deviates from an ATC clearance in response to a Traffic Alert and Collision Avoidance System resolution advisory must notify ATC of that deviation as soon as possible. REFERENCE- Pilot/Controller Glossary Term- Traffic Alert and Collision Avoidance System. When weather conditions permit, during the time an IFR flight is operating, it is the direct responsibility of the pilot to avoid other aircraft since VFR flights may be operating in the same area without the knowledge of ATC. Traffic clearances provide standard separation only between IFR flights.
Oral Exam Questions a DPE Might Ask
Q1What exactly is an ATC clearance, and what is it not?
Per AIM 4-4-1, an ATC clearance is an authorization by ATC, based on known traffic and known physical airport conditions, for an aircraft to proceed under specified conditions within controlled airspace to prevent collisions between known aircraft. It is NOT authorization to deviate from any rule, regulation, or minimum altitude, nor to conduct unsafe operation of the aircraft.
Q2If ATC issues you a clearance you believe would put the aircraft in jeopardy or cause you to violate a regulation, what must you do?
Per AIM 4-4-1 and 14 CFR 91.3(a), the pilot-in-command is the final authority for the operation of the aircraft. It is the pilot's responsibility to request an amended clearance. Similarly, if you prefer a different course of action — such as a 360 for spacing, a different runway, or a delay — you are expected to inform ATC and then cooperate to avoid disrupting traffic flow.
Q3While operating IFR in VMC, who is responsible for traffic separation from VFR aircraft?
Per AIM 4-4-1, when weather conditions permit during IFR flight, it is the direct responsibility of the pilot to see and avoid other aircraft, because VFR flights may be operating in the same area without ATC's knowledge. Traffic clearances provide standard separation only between IFR flights. Additionally, any deviation from a clearance in response to a TCAS resolution advisory must be reported to ATC as soon as possible.
Related Paragraphs in AIM Chapter 4