Helicopter Sikorsky HO4S-2 Serial 55-320 Register 55320 used by Royal Canadian Navy (1945-1968). Built 1952. Aircraft history and location Aircraft History 55320 Royal Canadian Navy (1945-1968) 1952-12-19HO4S-2 RCN d/d 19dec52 1955 conv to HO4S-3 w/o 10jul61 ditched off the South Carolina coast. Crew recued by USS Van Vooris (DE 1028) Send Updates Use APP to upload photo @ (optional) When Now? / / Send