Airworthiness Directive · Amendment 39-14238 · Turbomeca S.A. Arrius 2F Turboshaft Engines
Turbomeca S.A. Arrius 2F Turboshaft Engines
Superseded. A later AD replaced this one: AD 2005-17-17 R1. Comply with the one in force.
This AD applies to Turbomeca S.A. Arrius 2F turboshaft engines. These engines are installed on, but not limited to, Eurocopter EC120B helicopters.
The FAA is adopting a new airworthiness directive (AD) for Turbomeca S.A. Arrius 2F turboshaft engines. This AD requires replacing certain O-rings on the check valve piston in the lubrication unit. This AD results from a report of a forced landing of a Eurocopter EC120B helicopter. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine, which could result in a forced autorotation landing and damage to the helicopter.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Replace the O-ring on the check valve piston in the lubrication unit at the intervals specified in Table 1 of this AD. Use the “Instructions to be Incorporated,” 2.A. through 2.C. (2) of Turbomeca Alert Service Bulletin No. A319 79 4802, dated June 21, 2005, to replace the O-ring.
| If the class of oil is * * * | Then replace the O-ring by the later of * * * | Thereafter, replace the O-ring within * * * |
|---|---|---|
| (1) HTS or unknown | 300 hours time-since-new (TSN) or 50 hours after the effective date of this AD | 300 hours time-since-last replacement (TSR). |
| (2) STD | 450 hours TSN or 50 hours after the effective date of this AD | 500 hours TSR. |
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
