Sorry Guys, for me it's got to be the Bell 212. Huey with a spare engine. Worked on them in my time with Bristow Helicopters, what can I say, the ultimate flying truck!
Also worked on S-76A and A+, looks nice from the outside, but changing the mag plug on the main rotor gearbox is a true bitch of a job! About 1,1/2" of clearance from the firewall (not good for wire locking!).
Not to say the hell hole on the 212 is a barrel of laughs, especially when the a/c had been flying oil field support in Nigeria for 2 years (We're talking BIG bugs preserved in jam like Aeroshell 41 hydraulic fluid)!
Got chased across an airfield in a Land Rover by a Mil-24 at Redhill once, scary moment, but that's another story!
Beers,
Rob M.