Good Afternoon,
I need help with a PNR question I was asked in my CFPA exam. A similar question has already been asked in this forum but I can’t find any answers on it. If anyone could help as I’m retaking the exam on the 16th that would be greatly appreciated.
You are an air transport flight flying from A to C total distance 507nm. You are currently at B which is 203nm from C
current fuel 330kg Fuel flow 130kg/hr
TAS 240kt
wind from B to C -40kts
PNR to B +40kts
B to A +25kts
What is the distance and time from B to the PNR back to A
Standard question and a very common real world question for heavier aircraft.
(a) figure out the fuel burn from your position (B) back to A and deduct that (plus contingency) from the total usable fuel at B.
(b) use the resulting fuel to figure out your PNR from B towards C and back to B. You have addressed the B to A bit at (a), above.
Engineering specialist in aircraft performance and weight control.