When operating under Instrument Flight Rules (IFR), pilots must file a flight plan that cannot be amended or canceled within 46 minutes of departure. This rule ensures safety and efficiency within Air Traffic Control (ATC).
Why the 46-Minute Rule?
Once a flight plan is filed, ATC coordinates with various sectors and allocates resources. Sudden changes can disrupt these operations, affecting safety and efficiency.
What Constitutes a Change?
In addition to altitude or flight level, destination, and route changes, altering the speed of an aircraft constitutes a change. If the average true airspeed at cruising altitude varies by plus or minus 5 percent or 10 knots, ATC must be advised.
How to Manage Changes?
- Plan Ahead: Ensure your flight plan is accurate and finalized before the 46-minute cutoff.
- Communicate Early: If changes are needed, notify ATC promptly. Changes should be made more than 46 minutes before departure using the Amend Flight Plan feature offered by iFlightPlanner. If unavailable, contact an ATC facility or FSS.
- Update Departure Times: Notify ATC if your departure is delayed by more than 2 hours to keep the flight plan active. Due to traffic saturation, ATC may not accept revisions via radio, so contact a flight plan service provider or FSS.
By understanding and adhering to this rule, pilots can contribute to a safer, more efficient air traffic system.
