JAA groundschool instructor

[Jay_solo]

Hi,

I know there is an AOPA certificate to teach PPL ground. But If you just want to teach the ATPL groundschool at any flight school/academy, do you need a JAA FI rating or CPL or any official JAA certificate?

Or can you teach it with just a PPL and ATPL knowledge, (like the FAA Certified Ground Instructor ratings)

thanks