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Answer discrepancy - Echo T/O Chart

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lucasgozzard created the topic: Answer discrepancy - Echo T/O Chart

Hi Bob,

The answer I got to an Echo T/O Chart question was incorrect but I can't seem to work out why it's wrong. I took a lot of care with my lines etc and entry arguments.

I've attached a copy of the question and my working. Hopefully you can see my lines ok.

I'd appreciate your thoughts as to where I may have gone wrong?
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Kaos replied the topic: Answer discrepancy - Echo T/O Chart

I'm also getting the same answer. Runway 09 with 20kt headwind gives 2900 kg MTOW, Runway 18/36 (with 20kt crosswind) also give me 2900kg...
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lucasgozzard replied the topic: Answer discrepancy - Echo T/O Chart

Thanks mate.

So your lines look pretty much same as mine?
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Kaos replied the topic: Answer discrepancy - Echo T/O Chart

Yeah almost identical. Unsure if we're missing something but I keep getting 2900
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lucasgozzard replied the topic: Answer discrepancy - Echo T/O Chart

Yeah ok sweet.

I'm revising all the topics. My exam is on the 10th Dec.

Glad you asked for clarification about that variable fuel reserve. I overlooked that note.

Perhaps we need to ring CASA?
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Kaos replied the topic: Answer discrepancy - Echo T/O Chart

Mine is next week haha! I'm pretty sure Alternate isn't included, they've changed the definition to Trip Fuel instead of Flight fuel so that makes a difference. I'll call them in the next few days if I can't get it clarified.

Good luck for the 10th!
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lucasgozzard replied the topic: Answer discrepancy - Echo T/O Chart

Good luck for next week mate! Keen to hear how it goes. Yeah I would have overlooked that. Yikes!! Let me know what CASA say if you call them.

Thanks mate!
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  • John.Heddles
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John.Heddles replied the topic: Answer discrepancy - Echo T/O Chart

I'm also getting the same answer. Runway 09 with 20kt headwind gives 2900 kg MTOW, Runway 18/36 (with 20kt crosswind) also give me 2900kg...

Perhaps you good folks need to redo the chart for the 900m case again ? Suggest you scan your chart and post it for comment.

Engineering specialist in aircraft performance and weight control.
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lucasgozzard replied the topic: Answer discrepancy - Echo T/O Chart

Hi John,

I've attached a scan of my working.
Cheers.

Lucas.
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John.Heddles replied the topic: Answer discrepancy - Echo T/O Chart

hmmm ... perhaps my earlier eyeball run around the carpets might have been a tad casual.

This time I have done what I should have done first off ... run the lines in a graphics package to minimise errors. Indeed, it looks like both options result in a weight around 2900 kg.

Apologies for my cavalier carelessness first time around ...



Appears that the answer in the question might be a little off the mark, perhaps ?

Engineering specialist in aircraft performance and weight control.
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