ifr proceduresFAA-published sample question (IRA, Aug 2021)
While on an IFR flight plan, you should notify ATC of a variation in speed when
A
ground speed changes more than 5 knots.
B
average TAS changes 10 knots or 5 percent.✓ Correct Answer
C
ground speed changes by 10 MPH or more.
Explanation
AIM 5-3-3 lists, among the reports required without ATC request, a change in the average true airspeed at cruising altitude when it varies by 5 percent or 10 knots (whichever is greater) from the flight plan. The report is based on true airspeed, not groundspeed, since groundspeed changes with the wind and tells ATC nothing about your planned performance.
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