When calculating a PNR for a Part 135 flight with a 10% contingency requirement, I would like to confirm the correct interpretation of safe endurance.
My understanding is that the trip fuel for the original A to B sector is not used in the PNR calculation, because once the PNR is being determined the relevant flight becomes:
Departure -> PNR -> Departure
Therefore the safe endurance should be:
PNR trip fuel = (Fuel at take-off − final reserve fuel − holding fuel) ÷ 1.1
with the PNR trip fuel then converted to time at the applicable cruise fuel flow.
The reason I am asking is that the original A to B flight may contain margin fuel, and I want to confirm that the 10% contingency is applied only to the fuel required for the PNR return calculation, rather than being based on the originally planned A to B trip fuel to destination.
Can someone confirm whether this is the correct interpretation?
Yes, your Safe Endurance (for a PNR calculation) is your fuel at Take-Off minus Final Reserve Fuel minus Holding Fuel (for Departure Point not Destination) divide by 1.1. Bare in mind that sometimes you may have enough margin fuel that your PNR is past your destination.
Cheers W
Thanks!! Much appreciated.