PPL Video Lectures covering Aerodynamics, General Knowledge, Performance, Meteorology And Navigation are now available through our website see front page for details.
Welcome to the CPL Performance question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
bobtait replied the topic: Revision Exercises on ETP and PNR
In this case, you have assessed the fuel on board over the NDB is 95 gallons and you have burnt 15.8 gallons since departure. So the fuel on board at take-off is 110.8 gallons. (I'm not sure where you got 172 from). So, if you base your safe endurance calculation on 110.8 gallons. That's at take-off, so there is no need to consider the taxi fuel because the PNR safe endurance calculation is based on the trip fuel available at take-off.