On Dec 7, 12:41*pm, jcarlyle wrote:
Here's the tricky bit - I have the older JAA Form One,
and on it under remarks it says the 4555 has TS 10.220/48, which is
equivalent to TSO C10b.

My research indicates that the European equivalent of TSO C10b is ETSO-
C10b. I have searched for "TS 10.220/48" but can't find it anywhere.
Can you tell us how you know TS 10.220/48 is equivalent to TSO C10b.
Not saying it isn't, but would like to have a reference.

thanks,

Andy