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HeliTorque :: View topic - Quadrantal rule
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HeliTorque Forum Index » Ground School

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Quadrantal rule
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paddywak
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PostPosted: Sat Jul 25, 2009 10:06 pm    Post subject: Quadrantal rule Reply with quote

Question: you are in level flight ( outside controlled airspace) on a heading of 095. Due to wind your mag track is 087. The QNH is 994mbs. If you wish to comply with the quadrantal rule, you should fly at:
A an indicated 5000ft with 1013 set
B an indicated 5500ft with 1013 set
C an indicated 3000ft with 1013 set
D an indicated 3500ft with 994 set

I know that for a mag track of 087 is less than 090 so it has to be an odd FL and I also know that you must fly above the transistion level with 1013mb set on the altimeter.So that leaves A and C. I know also that 1mb =30ft more or less but I dont know if I should use the 994mb to work out the FL or the 1013mb. Please help. Confusion
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WhirlyGirl
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PostPosted: Sat Jul 25, 2009 10:33 pm    Post subject: Reply with quote

You are on the right track with ODDs as the QR is based on magnetic track so as you say this rules out B and D... but always draw a little picture to visualise this next bit...

The significance of the QNH being 994 is that this would mean a 570' difference between sea level pressure and the 1013 datum, therefore if you are flying along at 3,000' with the QNH set and you change your altimeter to 1013, it is now going to indicate 3,570' (you haven't moved it's just the indication that is different).

Therefore "today", FL30 is not available, and neither is FL35. So the first available FL would be FL40, and that's no good because it's an even one. So what do you reckon the answer is?

I still draw pictures...!

Sarah
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paddywak
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PostPosted: Sat Jul 25, 2009 10:40 pm    Post subject: Reply with quote

Ahh thanks Sarah it has to be 5000ft on 1013mb, great stuff, yet again you've cleared things up! I owe you a drink or two.
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WhirlyGirl
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PostPosted: Sat Jul 25, 2009 10:43 pm    Post subject: Reply with quote

Awesome... come to the HeliTorque Xmas Bash (where ever it may be this year!) and I will claim my beers! Laughing

Sarah
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paddywak
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PostPosted: Sat Jul 25, 2009 10:52 pm    Post subject: Reply with quote

Ok, you're on. I'll see you there where ever it may be. Thanks again I can sleep in peace now! Very Happy
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PostPosted: Sun Jul 26, 2009 6:31 am    Post subject: Reply with quote

Paddywak

If you're bored you might want to read this.

http://www.nats-uk.ead-it.com/aip/current/enr/EG_ENR_1_7_en.pdf

Its the official 'how we do altimeter settings' in the uk.

Theres a graph at the back that gives a quick decode of Altitude to FL based on the QNH.

Gary
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PostPosted: Sun Jul 26, 2009 6:51 pm    Post subject: Reply with quote

Thanks Gary , a handy bit of info.

Leigh
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