Point of No Return (PNR)

The Point of No Return (PNR) is the furthest point along a route that an aircraft can fly and still have enough fuel to safely return to the departure aerodrome while maintaining all required fuel reserves. It is heavily influenced by wind, as a headwind outbound results in a tailwind on the return leg.

Key Points

• •Calculated using planned ground speed, fuel flow, and available safe endurance.
• •Wind variations significantly affect the physical distance to the PNR along the route.
• •All mandatory fuel reserves must be accounted for before the PNR calculation is made.

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