swsw,
Your count is way off. The typical helicopter has between 100 and 500 parts that are flight critical ("critical 1" to use your grading system.)
I think you forgot that the tail rotor itself has about 40, and its gearbox has about 20. Tail drive shafts? Main transmission interior parts? Work your way across the machine (don't forget the 100 flight control parts, each rod has two bearings, two nut-bolt sets, for example).