HH-1K
Bell was awarded a contract by the US Navy in December 1968 for a new search and rescue helicopter. The aircraft was designated the HH-1K and was basically a UH-1E with different avionics and the Lycoming T53-L-13 powerplant of 1,400 shp (1,000 kW).
Deliveries of the “Kilo” Huey started in May 1970 and by November of that year three had been sent to Vietnam to serve with US Navy squadron HA(L)-3 and, later with the HA(L)-4 Red Wolves and the HA(L)-5 Blue Hawks. A total of 27 HH-1Ks were produced.
Read more about this topic: Bell UH-1 Iroquois Variants