Just a quickie,
You do realise that, if we are talking about 90/200. then these a/c are NOT listed on the JAA/EASA type rating list (they are below 5700Kgs) and there is therefore unlikely to be a listed approved JAA maintenance organisation. At the moment a/c below 5700Kgs are allowed to be maintained under a countries own national authority regulations (although it is possible for a company to seek JAA authorisation).