Quadrantel Rule

[JPS 0]

Hello everyone and first of all Happy New Year to you all :shok:. I am currently studying for my air law exam and its seems to be going well so far. My instructor explained to me the Quadrantel rule some weeks ago but it has slipped my mind of how to use it and now Im lost . I have looked in my text book but it doesn't give details how to work it out it just has a diagram which isnt much help if your puzzled like I am. My instructor didnt have time after my lesson yesterday to go over it again as she had another lesson. So if any PPL's or anyone with a knowledge of the quadrantel rule are here please could you explain to me how to work it out.

Any input is greatly appreciated

[allardjd 1,853]

I found this at another site...

 

Quote

In very simple terms (for the UK):

 

Outside CAS, you can use quadrantal rules for cruising levels below FL 245. (and you can do it VFR as well as IFR)

 

This provides at least 500ft separation against traffic going in a different general direction to you (but not against traffic going in broadly the same 90 deg sector as yourself). It therefore does not remove the need for a lookout!

 

Taking a compass rose and dividing it into quarters:

1) From 360 - 089 deg M: Odd levels (30/50/70/90/etc)

2) From 090 - 179 deg M: Odd +500 ft (35/55/75/95 etc)

3) From 180 - 269 deg M: Even levels (40/60/80/100 etc)

4) From 270 - 359 deg M: Even +500 ft (45/65/85/105 etc)

 

It is based upon your magnetic TRACK, not HEADING.

 

In Controlled airspace and above FL245 use the semi-circular rule. This means the 500ft bits are removed and we use whole even or odd levels depending upon the magnetic direction.

 

[JPS 0]

Thanks for the reply allardjd :great:

But could someone talk me through this question and how I go about answering it with regards to the Quadrantel rule.

"You are in level flight (outside of controlled airspace) on a heading of 175. Due to wind drift your magnetic track is due south. The QNH is 1020 mbs. If you wish to comply with the quadrantal rule, you should fly at":

A) an indicated 4000 ft with an altimeter setting of 1020 mbs

:great: an indicated 3500 ft with an altimeter setting of 1020 mbs

C) an indicated 3500 ft with an altimeter setting of 1013 mbs

D) an indicated 4000 ft with an altimeter setting of 1013 mbs

:smile:

[CyprusAirwaysA330 0]

C and D can be discounted as 1013mb is used as Standard Pressure which is above 6000 feet in the UK. As the Quadrantel Rule uses magnetic track, which due to wind is 180 degrees, you would thus have to be flying at 4000 feet. Thus A is right.

If I got this wrong, someone please correct me.

[allardjd 1,853]

A looks correct to me...

 

I didn't know about the trasition altitude in the UK - it's 18,000 here. If it's greater than 4,000, A is the only answer that works. By the way, the correct spelling is...

 

Quadrantal

 

...I think.

 

John

[CyprusAirwaysA330 0]

Yeah, it is Quadrantal. Transition Altitude is 6000 in the UK, so A is right.

[JPS 0]

Yeah, it is Quadrantal. Transition Altitude is 6000 in the UK, so A is right.

Actually the transition Altitude in the UK is 3000ft outside controlled airspace. I Have the answer and it is not A it is infact D but as to why this is I am still trying to work out...anymore ideas?

Thanks so far for the help guys :smile:

[JPS 0]

I have been trying to work it out and so far this is what I have got...

Ok the Transition level in the UK is 3000ft which from here and beyond is where the altimeter can be set to the standard 1013mb.

The question reads "You are in level flight (outside of controlled airspace) on a heading of 175. Due to wind drift your magnetic track is due south. The QNH is 1020 mbs. If you wish to comply with the quadrantal rule, you should fly at":

Flying on a heading of 175 would mean we fall into odd FL +500 but as there is wind drift it means we are flying due south thus we fall into the even FL. From the options we have 4000ft and a setting of 1020mbs which cannot be correct as we are over 3000ft transition alitude. Which then means we are either answer C or D. C cannot be right because 3500ft is a odd fl +500 therefore D is correct as we are at 4000ft (Even FL) and on the standard altimeter setting.

Hope that all makes sense but I think I have cracked it now :dance:

[CyprusAirwaysA330 0]

I thought the transition level was 6000? On the Virgin 747-400 video I have I'm pretty sure that transition level is 6000. Anyways, as transition level is 3000, thus take A but with 1013mb, so D. I think thats right now. Good to know you've got it now.