Avanti Subject of Proposed Airworthiness Directive

 - November 25, 2009, 7:49 AM

The FAA is proposing an Airworthiness Directive (AD) for the Piaggio Avanti based upon an operator report of a short circuit between a generator power cable and an anti-ice shutoff valve, which was caused by chafing between the cable and the valve. The insulation of the cable and surrounding sleeve were worn off as a result. An investigation revealed that insufficient clearance between the cables and adjacent parts and vibration of the power cables caused by insufficient clamping were the root causes of the damage. According to the FAA, if left uncorrected the situation could lead to short circuits, with possible fire and/or loss of important aircraft systems. The AD would require an inspection to detect damaged cables/sleeves and replacement/repair, as necessary. In addition, it would require operators to ensure acceptable minimum clearances between cables and parts and to improve clamping to minimize vibration of the cables. Piaggio Aero Industries has issued Service Bulletin (Mandatory) N.: 80-0271. The FAA is taking comments until Jan. 4, 2010.