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Great question! D you know???

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Old 8th Dec 2014, 11:09
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Great question! D you know???

No, not just for people in Melbourne...
With cloud overcast at 3,100’ - what’s the highest altitude you can fly over Avalon under the VFR?
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Old 8th Dec 2014, 11:16
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I suspect you are wondering if it's 2,100ft or 3,000 ft.... But class E only goes to 2,500ft.

You have asked a trick question, as you didn't specify under or over the cloud so in fact, the answer would be as high as I am allowed in Class C airspace subject to the limitations of my aircraft and equipment as I could very well be VFR over the top at even 8,000+ or more for example.

You also didn't say OCTA or not so of you intended to fly through VFR OCTA with 3,100 overcast you might be out of luck.... Is that what you are thinking?
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Old 8th Dec 2014, 11:25
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2499'

In class D. only require 500' clear of cloud above.

At 2500' you're in class E and require 1000' above
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Old 8th Dec 2014, 11:34
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It's been a while since I've flown down that way, but looking at a VTC that I have, Avalon is class D from SFC to 2500, and class E 2500 to 4500.

Class D requires you to be 500 ft below cloud; Class E requires 1000 ft vertical separation. So if you're in E, the highest you can be is 2100 ft but at 2100 ft, you're in D, so that means you only need to be 500 ft below cloud. So if the cloud base is 3100 ft, 500 ft below the cloud base means you can be at 2600 ft but that puts you in E and in E, you need 1000 ft vertical separation from cloud.

So I guess that's why you're asking because there is no clear answer! Good one!
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Old 8th Dec 2014, 18:12
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At 2500' you're in class E and require 1000' above.
At 2500' you're in D, not E, when the tower is open.

The answer to the question is 2500', unless VFR on top.

Last edited by Creampuff; 8th Dec 2014 at 18:27.
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Old 8th Dec 2014, 18:30
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But if you ask for a clearance at 2500' you'll be told you don't need one, you're in class E!
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Old 8th Dec 2014, 18:34
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Hmmmmmmm. I may have to consult the Big Book of vertically adjacent airspace rules.
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Old 8th Dec 2014, 18:47
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If the D/E vertical boundary is 2500, and you're cruising at 2500, you're in E.


At vertical boundaries, you are in the "lesser" class of airspace, reference is AIP ENR 1.4-2 Para 1.1.7

Last edited by KRviator; 8th Dec 2014 at 18:59.
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Old 8th Dec 2014, 19:01
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I stand corrected.

AIP ENR 1.4-2 para 1.1.7:
When ATS airspaces adjoin vertically (one above the other), flights at the common level must comply with the requirements of, and will be given services applicable to, the less restrictive class of airspace. ...

Last edited by Creampuff; 8th Dec 2014 at 19:31. Reason: Corrrected AIP ref
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Old 8th Dec 2014, 19:47
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Cloud clearance?

When in E and VFR below 3000 AMSL, do you not simply need to be clear of cloud and have surface (ground or water) in sight?

So as far as the OP's question goes, my answer would have been therefore (technically) to transit at 3000ft if wishing to remain OCTA. BUT I would be inclined to remain at 2500 to ensure less winkage if old mate in his light twin kero burner suddenly dropped out of said cloud.
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Old 9th Dec 2014, 01:07
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Do flyers realise that at Avalon, the D (Tower) airspace IS NOT controlled by the tower!
When the tower is open, they do not own any airspace!
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Old 9th Dec 2014, 01:24
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So is the answer 3,000ft ?
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Old 9th Dec 2014, 01:44
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Do flyers realise that at Avalon, the D (Tower) airspace IS NOT controlled by the tower! When the tower is open, they do not own any airspace!
Yes, more Australian aviation garbage. Not published anywhere to my knowledge either?
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Old 9th Dec 2014, 01:46
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Nomde plume had it in post 3. 2499 if the tower is active. Probably 2400 effectively or a 'not above 2500' clearance flying at just under 2500.

2100 if the tower is inactive and E goes down to 700.
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Old 9th Dec 2014, 08:39
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Ahhhhhhhh yuk me head hurts

Just don't fly into the cloud or kill yourself and you'll be fine....... ( yes by definition I guess )

Rules rules too many damn rules!!

Blue sky bit up, brown down

Pull back, houses get smaller
Push forward houses get bigger.
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Old 9th Dec 2014, 23:52
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Pull back, houses get smaller
Push forward houses get bigger.
Keep pulling back, and all of a sudden, the houses start getting bigger again!!.
Tootle pip!!
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Old 10th Dec 2014, 01:26
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Rules, rules, too many damn rules!!
Does seem that way, doesn't it?

So just what is the definite correct answer?

File IFR.
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Old 10th Dec 2014, 01:37
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Nah stay on the ground and drive!!
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