Originally Posted by
Len-ticular
Hi there all,
I was hoping that there might be someone out that might be able to explain the steps (required calculations) required to calculate a PNR for an off track alternate.
ie Flying 500nm between point "A" and point "B" and there is an alternate 90 nm off track midway along track.
Any help would be very much appreciated.
Are you sure you want PNR and not ETP? Considering you indicated an "alternate" perhaps you are referring to an ETP. There is a difference.
The Point of No Return (PNR) is the farthest point to which the aircraft can go and be able to return to the departure point with adequate holding, approach, landing, and alternate fuel.
An Equal Time Point (ETP) is the geographical point in a flight whereby the aircraft has the same flying time to an alternate airport as the flying time to another airport, typically an alternate.