EASA NAV(A)intermediate
Arrange the sequential steps required to calculate an estimated time of arrival (ETA) given route distance, true airspeed (TAS), wind conditions, and departure time (ETD).
Answer
Calculate groundspeed using true airspeed (TAS) and the wind vector, Divide route distance by groundspeed to obtain flight duration in hours, Convert fractional hours of flight duration into minutes, Add total flight duration to the estimated time of departure (ETD)
Explanation
The correct sequence is to find the speed over the ground, calculate the duration, express it in usable time units, and add it to departure time. **Key takeaway:** ETA calculation depends on a correctly determined groundspeed. **Glossary:** ETD: estimated time of departure; ETA: estimated time of arrival.
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