AIM ¶ 5-4-4 — Advance Approach Information
AIM 5-4-4 explains how ATC provides advance instrument approach information, when it's required, and pilot responsibilities at towered and uncontrolled airports.
AIM 5-4-4 explains how pilots get a heads-up about which instrument approach to expect when arriving at an airport with approach control services and two or more published IAPs.
Key points:
- The expected approach (or notice of a likely visual approach vector) is broadcast by a controller or on ATIS.
- This advance info is not required when visibility is 3 SM or better and the ceiling is at or above the highest initial approach altitude for any low-altitude IAP at that airport.
- It is planning information only — not a clearance. Weather, winds, or a blocked runway can change it.
- Pilots must immediately tell ATC if they can't fly the assigned approach or want a different one.
For uncontrolled airports with ASOS/AWOS, monitor the broadcast, then advise ATC you have the weather and state your intentions. Controllers treat long-line automated weather as trend/planning only and rely on you for current conditions. The pilot — not ATC — determines whether weather is adequate for the approach.
After ATC says "change to advisory frequency approved," broadcast your intentions on CTAF/UNICOM: type of approach, position, and again when crossing the FAF inbound (nonprecision) or the OM/fix in lieu inbound (precision). Keep monitoring for other traffic.