Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed 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:
The back-up mode can be activated by an electrostatic discharge or by a malfunction of the collective pitch signal. The two engines fitted on the same helicopter can therefore be frozen in this back- up position at 85% N1.
Freezing both engines in the back-up mode can lead to an inability to continue safe flight and forced landing. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.