EASA NAV(A)advanced
Explain how a pilot can estimate a revised ETA after discovering that the aircraft is ahead of schedule.
Answer
Determine the actual time taken to cover a known distance, calculate actual groundspeed, divide remaining distance by that groundspeed to estimate remaining time, then add the remaining time to the current time.
Explanation
A revised ETA should use observed performance rather than the original estimate. Calculate actual groundspeed from distance and elapsed time, then apply $t_{remaining}=D_{remaining}/GS_{actual}$. Add that time to the present time, while accounting for any expected changes in wind or route. **Key takeaway:** Recalculate ETA using actual groundspeed and remaining distance.\n\n**Glossary:** **ETA**: estimated time of arrival; **actual groundspeed**: observed ground distance per unit time.
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