Viking
The ACO originally purchased 100 Vikings. Over the years this dwindled to around 70 airwothy aircraft as incidents damaged them and rather than repair them ACCGS put them in store or sold them. To explain this there was a problem with getting host stations to accept winch launched operations and so the Vigilant fleet was grown to about the same numbers. Whilst there may have been very temporary shortages it never stopped us flying the remaining serviceable ones.
ACW