TURBINE AUGUST 2011 THE VOICE OF GENERAL AVIATION www.aopa.org King Air 250 POWER SUBSTANCE p. T–4 Finding the Fix Vector-to-Final’s Dark siDe p. T–15 Red Bull Helicopter Yes, it Does Back Flips p. 66 50 Years of Cherokees the one that starteD it all p. 58http://www.aopa.org