Skip to main content
This glossary is written for virtual airline and flight simulation use within Virtual Air Canada Airline. It is not intended as a real-world aviation reference.
The Initial Approach Fix is the defined point on an instrument approach procedure where the approach sequence officially begins. It is identified on approach charts as a named fix - typically a VOR, NDB, waypoint, or intersection - and is where the aircraft transitions from the en route or terminal environment into the published approach structure. At the IAF, crews are expected to be at the charted altitude, configured appropriately, and cleared for the approach. From the IAF, the procedure guides the aircraft through the intermediate and final approach segments to the runway. Some approaches have multiple IAFs to accommodate aircraft arriving from different directions. Each IAF connects to the same intermediate fix or final approach course, but provides a different entry path. On RNAV approaches, IAFs are designated GPS waypoints and the route between the IAF and the final approach fix is precisely defined. On conventional approaches using VORs or NDBs, the IAF may require a procedure turn or holding pattern to align with the final approach course. The IAF altitude is a minimum - crews may be higher, but must descend to the charted altitude before or at the IAF unless otherwise instructed by ATC.

​
In Virtual Airline Operations

At Virtual Air Canada Airline, flying accurate approaches means loading and following published procedures through SimBrief and the FMS. Identifying the correct IAF for the active runway and approach type ensures the aircraft intercepts the approach correctly rather than being vectored or flying an improvised path. On online networks like VATSIM, controllers often clear pilots direct to the IAF, making familiarity with the fix name and location essential for smooth operations.
  • ILS - Instrument Landing System
  • FAF - Final Approach Fix
  • LNAV - Lateral Navigation