http://advisorycirculars.com/certification-aircraft-parts-engines-airworthiness-standards/guidance-for-30-second-and-2-minute-one-engine-inoperative-oei-ratings-for-rotorcraft-turbine-engines/ Quickly find information regarding FAA & International Aviation Advisory Circulars Wed, 31 Dec 2008 15:53:11 +0000 http://wordpress.org/?v=2.9 hourly 1