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Answer discrepancy - Echo T/O Chart

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(@user4424)
Trusted Member Customer
Joined: 14 hours ago
Posts: 53
Topic starter  

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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(@user4828)
Eminent Member Customer
Joined: 14 hours ago
Posts: 17
 

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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(@user4424)
Trusted Member Customer
Joined: 14 hours ago
Posts: 53
Topic starter  

Thanks mate.

So your lines look pretty much same as mine?



   
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(@user4828)
Eminent Member Customer
Joined: 14 hours ago
Posts: 17
 

Yeah almost identical. Unsure if we're missing something but I keep getting 2900



   
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(@user4424)
Trusted Member Customer
Joined: 14 hours ago
Posts: 53
Topic starter  

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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(@user4828)
Eminent Member Customer
Joined: 14 hours ago
Posts: 17
 

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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(@user4424)
Trusted Member Customer
Joined: 14 hours ago
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Topic starter  

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)
Famed Member Customer
Joined: 10 years ago
Posts: 955
 

[i][b]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...[/b][/i]

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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(@user4424)
Trusted Member Customer
Joined: 14 hours ago
Posts: 53
Topic starter  

Hi John,

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

Lucas.



   
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(@john-heddles)
Famed Member Customer
Joined: 10 years ago
Posts: 955
 

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 ...

[attachment=1444]Graphic1.jpg[/attachment]

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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User 3940
(@user3940)
Honorable Member Customer
Joined: 14 hours ago
Posts: 572
 

Lucas

I afraid that was a mistake on my part, somehow I had no answers being correct I have amended the answer set and it now

states that 2900 is correct.

Cheers



   
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