Given:
Distance from departure to destination: 200 NM
Safe Endurance: 3 h
TAS: 130 kt
Ground Speed Out: 150 kt
Ground Speed Home: 110 kt
What is the distance PSR from the departure point?
Distance to Point of Safe Return = Endurance x GS OUT x GS home / (GS out + GS home)
3 hrs x 150 kts x 110 kts / (150 kts + 110 kts) = 190 NM
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