Airworthiness Directive · Amendment 39-14865 · Turbomeca Model Arrius 2B1, 2B1A, and 2B2 Turboshaft Engines
Turbomeca Model Arrius 2B1, 2B1A, and 2B2 Turboshaft Engines
This AD applies to Turbomeca Model Arrius 2B1, 2B1A, and 2B2 turboshaft engines that do not embody modification TU122. These engines are used on, but not limited to Eurocopter EC135 T1 and T2 helicopters.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) Replace the check-valve piston o-ring according to paragraph 2 of Turbomeca Alert Service Bulletin No A319 79 2832, Update 1, dated April 3, 2006, within the next 50 operating hours when the number of operating hours is greater than:
(i) 300 hours for engines operating with HTS-class oil and engines for which the history of the oils used is not available or engines which used to operate with HTS-class oil and which no longer do so.
(ii) 450 hours for engines operating with STD class-oil since their introduction into service.
(2) Repeat operation of paragraph (1):
(i) Every 300 hours for engines operating with HTS-class oil and engines for which the history of the oils used is not available or engines which used to operate with HTS-class oil and which no longer do so.
(ii) Every 500 hours for engines operating with STD class-oil since their introduction into service.
None.
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.
