The
prototype J60 (or JT12) first ran in 1958 with
production beginning in 1960.
The J60 was also converted into a turboshaft
engine for Sikorsky's S-64 Skycrane. The turboshaft engine
added a two-stage free turbine and was designated the T73 or JFTD12.
I've
also been told the J60 was easily damaged by FOD. (e-mail from Rick
Murray)
