The Sikorsky S-61L first flew on 2 November 1961, and was 4ft 3in (1.27m) longer than the HSS-2 in order to carry a substantial payload of freight or passengers. Initial production S-61Ls were powered by two 1350shp (1005kW) GE CT58-140 turboshafts, the civil version of the military T58. The S-61L features modified landing gear struts without float stabilisers. Mitsubishi Heavy Insudtries received a license to produce the S-61L for the Asian market in 1961. 
List of Operators of Mitsubishi S-61L | |
| From | Organisation with model S-61L | |||||
| Construction Numbers on database of S-61L | ||||||
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Construction Numbers | Help Us | |
| C/N | Year | History | ||
| M61-001 | 1962 |  JA9506 : Sikorsky S-61N, c/n 61-143, ff?; del Sikorsky as N94565+ | ||
M61-003  | 1963 | JA9507 : Sikorsky S-61L, c/n 61-223 ff?; del Sikorsky as N317Y u+ | ||