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Revision Exercises on ETP and PNR

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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.
#11

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Bosi72 replied the topic: Revision Exercises on ETP and PNR

Thanks Bob,
yes it was typo, should be 110.8.

>PNR safe endurance calculation is
>based on the trip fuel available at
> take-off.

I am comparing question 8 with question 12, but that's because we have 145gal at start-up.

Thanks again!
#12

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mlane90 replied the topic: Revision Exercises on ETP and PNR

Hi Bob and Stuart,

I’ve had a look in the ERRATA and it appears this one hasn’t been picked up yet.

Q11 on page 126 vs the answer on page 135 is conflicting.
#13
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Stuart Tait replied the topic: Revision Exercises on ETP and PNR

Thanks for that we've amended the question to reflect the answer



Cheers
#14
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bobtait replied the topic: Revision Exercises on ETP and PNR

You have recalculated the fuel available at the 103nm point. You knew how much fuel you had when you dipped the tanks and you know how long the engines have been running. You would have accounted for the taxi fuel when you did the recalculation. It's quite legal to recalculate the fuel in flight because you are basing it on actual observation of the flight up to that point.

Bob
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bobtait replied the topic: Revision Exercises on ETP and PNR

You have recalculated the fuel state in flight. You know how much fuel you had when you dipped the tanks and you know how long the engines have been running. You would have accounted for the taxi fuel when you did the recalculation. It's quite legal to recalculate the fuel in flight because you are basing the calculation on actual observation of how the flight has progressed. You are replanning the flight from the 103nm point.
#16

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