Navigation PPLintermediate
An aircraft is planned to fly a distance of 220 NM. The aircraft's true airspeed (TAS) is 130 kt and it encounters a 20 kt headwind component. What is the estimated flight time for this leg?
Answer
2 hours 00 minutes
Explanation
The headwind reduces groundspeed to `$130-15=115$` kt. Time is `$210/115=1.826$` hours, approximately 1 hour 50 minutes. **Key takeaway:** Use groundspeed—not TAS—in the distance–time calculation. **Glossary:** **TAS**: speed through the air; **GS**: speed over the ground.
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