Could someone remind me of the quandrantial FL rule please

[ndkeh01]

TA !!

[ndkeh01]

It'S ok,

I jus' found it in an earlier post.
Helps to make the AI safre you know!

[frigatebird]

Quadrential Rule, effective from transition alt to Flight Level 245 in uncontrolled airspace, is based on magnetic track NOT heading:

Track 000-089m ODD flight level
Track 090-179m ODD flight level+500'
Track 180-269m EVEN flight level
Track 270-359m EVEN flight level+500'

Above FL 245 the Semi-Circular rule applies:

Track 000-179m FL 250, 270, 290 then every 4000'
track 180-359m FL 260, 280, 310 then every 4000'


Cheers