Airworthiness Directives; SAAB Aircraft Model SAAB SF340A and SAAB 340B Airplanes

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This amendment adopts a new airworthiness directive (AD) that is applicable to certain SAAB Model SAAB SF340A and SAAB 340B airplanes. This action requires installation of a placard in the cockpit that informs the flight crew of the prohibition against moving the power levers below ``flight idle'' (beta mode) when the airplane is airborne. This amendment is prompted by an incident during which a Model SAAB 340B airplane, that was in ``beta mode'' for a short duration during descent, lost all engine power. The action specified in this AD is intended to prevent engine overspeed and the resultant loss of engine power.