AIM ¶ 3-5-1 — Airport Advisory Services
AIM 3-5-1 explains LAA, Final Guard, and RAIS advisory services at non-towered airports. Study guide for pilot students prepping for checkrides.
AIM 3-5-1 describes advisory services provided by Flight Service Stations (FSS) at airports without an operating control tower. Participation is recommended, not mandatory, but it improves safety at busy GA fields.
Two services are available:
- Local Airport Advisory (LAA) — Available only in Alaska, within 10 statute miles of an airport where the tower isn't operating but an FSS is on the field. The FSS provides full local advisories to arriving and departing aircraft.
- Remote Airport Information Service (RAIS) — Supports short-term special events like fly-ins, advertised by NOTAM D only. RAIS provides traffic and event instructions but no weather or Final Guard because the FSS lacks continuous wind/altimeter data.
Final Guard is a value-added service automatically provided during LAA/RAA operations in active weather. After you report "on-final" or "taking the active runway," the FSS monitors winds and altimeter and blind broadcasts significant changes until you report on-the-ground or airborne. Acknowledge the first check, but no response is expected for blind broadcasts due to cockpit workload. Always close the loop by reporting down or airborne.
When requesting remote ATC services, pilots must first monitor the automated weather broadcast at the landing airport.