Beechjet Operators Receive AFM Changes
Raytheon Aircraft has provided operators of the Beechjet/Hawker 400XP with revised airplane flight manual (AFM) pages on the use of engine anti-icing procedures intended to prevent further flameouts on the P&WC JT15D-powered twinjet. The revisions, based on Raytheon Aircraft Safety Communiqué No. 272 released August 8, also clarify the definition of high-altitude engine icing conditions and the use of engine anti-ice procedures within these conditions–namely, removing the 90-percent N1 limitation to turn on the engine anti-ice system. "It has been determined that reduction of power below 90-percent N1 is not required to prevent transient exceedance of engine ITT limits," according to the communiqué. Raytheon Aircraft, along with the FAA, Transport Canada and Pratt & Whitney Canada, has been actively working with the NTSB to address four Beechjet dual flameout incidents. "The Beechjet/Hawker 400XP fleet of more than 625 aircraft has accumulated over three million flight hours with an extraordinary safety record," a Raytheon spokesman said. Last Friday, the NTSB issued recommendations widening the engine icing issue to all turbine aircraft.