With an Allison 250 turbine engine (now Rolls-Royce Allison) this venerable workhorse has given both civil and military users a most excellent rotary wing platform.
At one time the most reliable aircraft in the world!
In a simple form inherited from the equally famous Bell 204, 205 "Iroquois" military helicopters this civil version is now scheduled for discontinued production. Many still being in service to date proves a most famous aircraft its' well deserved position as one of the most important 100 Aircraft of the past 100 years.