Airworthiness Directive · Amendment 39-17172 · Main rotor head
Eurocopter France Helicopters
This AD applies to Model SA341G helicopters, with rotating star, part number (P/N) 341A31.4116.21 installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Eurocopter France Model SA341G helicopters. This AD requires replacing any rotating star with more than 12,000 hours TIS. This AD was prompted by an analysis and tests performed by the manufacturer that indicate that the life limit of the rotating star should be 12,000 hours time- in-service (TIS). The actions of this AD are intended to prevent failure of the rotating star and subsequent loss of control of the helicopter.
You are responsible for performing each action required by this AD within the specified compliance time unless accomplished previously.
(1) Before further flight, remove any rotating star, P/N 341A31.4116.21, with 12,000 or more hours time-in-service (TIS), and replace it with an airworthy rotating star with less than 12,000 hours TIS.
(2) Revise the Airworthiness Limitations section of the Instructions for Continued Airworthiness by reducing the service life of the main rotor rotating star from unlimited hours TIS to 12,000 hours TIS.
