AD NUMBER: PL2008-06-51
MANUFACTURER: Fuel Injection Servos,Superior Air Parts,Teledyne Continental,Textron Lycoming
SUBJECT: Airworthiness Directive PL2008-06-51
SUMMARY: This emergency AD results from eighteen reports of fuel injection servo plugs, part number (P/N)383493, that had loosened or completely backed out of the threaded plug hole on the regulator cover of the fuel injection servo. These servo plugs were installed with servo plug gasket, P/N365533, under the plug hex-head. Precision Airmotive LLC investigated and determined that servo plug gasket, P/N 365533, can shrink from engine heat, causing the plug to lose torque against the servo regulator cover, allowing the plug to vibrate out. The threads on the plugs were also found damaged. Servo plug gaskets, P/N 365533, installed on RSA-5 and RSA-10 series fuel injection servos since August 22, 2006, are made of a different material than the previous gasket part number used. This condition, if not corrected, could result in a substantial loss of engine power and subsequent loss of control of the airplane.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/