1977 - original S76 with Allison C30
1982 - S76 Mk II with around 40 modifications
1985 - S76 B. Airframe changes, PT6 engines 1033 hp per side
1988 - S76 A+ had Arriel 1S1 with 700 hp
1991 - S76 C - has the B airframe but Arriel 1S1 @723 hp
- S76 A++ which is a basic A with the 1S1 retrofit
1996 - S76 C+ with 2S1 @856 hp.
There were about 300 Allison machines made, and 100 of those have been converted.
About 100 B models
So far about 100 C and C+
