Lynxman
I think we are getting there slowly, firstly I think by using the term CAA you are referring to EASA as the G120TP is an annex 1 aircraft.
Now for the big question, will the maintenance organisation require EASA145 approval ? And will the certifying staff require EASA part 66 licences ?
Also can parts repaired by an EASA 145 organisation be accepted for service on these aircraft without further approval from military authorities ?