AIM Text
Increased traffic congestion, aircraft in climb and descent attitudes, and pilot preoccupation with cockpit duties are some factors that increase the hazardous accident potential near the airport. The situation is further compounded when the weather is marginal, that is, just meeting VFR requirements. Pilots must be particularly alert when operating in the vicinity of an airport. This section defines some rules, practices, and procedures that pilots should be familiar with and adhere to for safe airport operations.
Source: FAA Aeronautical Information Manual · current edition · paragraph 4-3-1.
Research Notes
AIM 4-3-1 sets the framework for airport operations — the procedures, lighting, signage, and communications protocols that govern movement on and around airports.
The four primary airport contexts:
- Towered airports: Tower controls runway ops; Ground controls taxiways. Pilots receive specific clearances for taxi, takeoff, landing.
- Non-towered Class E surface area: Self-coordination on CTAF. IFR ops still receive ATC clearance from Center; VFR ops self-announce.
- Non-towered Class G: Self-coordination on CTAF. No ATC clearance required for any operation.
- Closed airports (NOTAM'd closed): Operations only by emergency or with the operator's specific permission.
Movement area vs non-movement area: Movement area = runways and taxiways under ATC control (at towered airports). Non-movement area = ramps, parking, hangars, FBO areas — under operator control, not ATC control. The line between them is typically painted on the surface.
Authorization to enter movement area: At towered airports, taxi onto a movement area requires ATC clearance from Ground (or Tower for runway crossing). Crossing an active runway without clearance is a runway incursion — among the most-tracked safety events in the NAS.
Reference: AIM 4-3 (Airport Operations); FAA Order 7110.65 § 3-7 (Taxi/Ground Movements).