BC Ferries is cancelling tonight's Kwuna sailings after 6:30 pm so the crew can make repairs to part of its propulsion system.The Kwuna started experiencing problems with one of its right angle drives on Thursday afternoon (Jan. 3). said BC Ferries spokesperson Deborah Marshall. As a result, five sailings were cancelled between 4:30 and 10 pm and one sailing was delayed. The Kwuna made one sailing from Alliford Bay at 6:25 pm, she said, carrying 44 passengers and a full load of vehicles, including a bus. Some vehicles and passengers may have been left behind on Moresby Island.The ferry is now using a tugboat to help it dock, but it will be stopping service at 6:30 pm today (Jan. 4) so repairs can be made."It's a big job and it takes a chunk of time to do it," Ms Marshall said.The Kwuna carries vehicles and passengers between Graham and Moresby Islands, a 20-minute sailing.Ms Marshall said if all goes as expected, it should be back on schedule by Saturday (Jan. 5).