Airworthiness Directive · Amendment 39-12864 · Turbomeca S.A. Arriel Models 2 S1, 2 B, and 2 C Turboshaft Engines
Turbomeca S.A. Arriel Models 2 S1, 2 B, and 2 C Turboshaft Engines
This airworthiness directive (AD) is applicable to Turbomeca S.A. Arriel models 2 S1, 2 B, and 2 C turboshaft engines. These engines are installed on, but not limited to Sikorsky S76, Eurocopter France "Ecureuil" AS 350 B3, and Eurocopter France "Dauphin" AS 365 N3 helicopters.
This amendment adopts a new airworthiness directive (AD), that is applicable to Turbomeca S.A. Arriel models 2 S1, 2 B, and 2 C turboshaft engines. This amendment requires initial and repetitive visual inspections for fuel leaks, and replacement of fuel pumps that are found leaking fuel. In addition, this amendment requires that fuel pumps found with pump wall thickness below minimum be removed from service. This amendment is prompted by a manufacturing investigation of pump bodies found to have below minimum material thickness, which could cause fuel leakage through thin, porous walls, reducing fuel pump fire resistance. The actions specified by this AD are intended to prevent fuel leakage, which may cause engine fires that could lead to an in- flight engine shutdown, damage to the helicopter, and forced landing.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
