The RCAF says a Cormorant helicopter was dispatched from its base at 19 Wing Comox, B.C., after receiving a call for help from the captain of the 225-metre Mitose on Wednesday morning.
The helicopter evacuated the crew member in the early afternoon from the ship, about 130 kilometres northwest of Vancouver Island.
The unidentified patient was then flown to Port Hardy where he was put on another RCAF aircraft for a flight to Comox.
The patient was transferred in stable condition to a local hospital, where he is recovering.
It was not known where the ship was heading at the time of the medical emergency.