ATSIN 111 I believe, titled, Use of obsolete RTF phraseology and multiple level instructions in Dep Clearances.
Altho have just had a look and it was withdrawn in July!
I remember something about aircraft working approach units outside CAS, and climbing to filed levels either before joining (and above cleared level to join) or as soon as they contacted an area unit...
Hope this helps!
LOA
ps. actually, i think that atsin might have referred to 'climb when instructed by radar' but its very similar! Which makes more sense with an a/c speaking to a radar unit before a 'control' unit..
Last edited by landedoutagain; 25th November 2008 at 13:00.
Reason: brainstorm! added ps