Summary
We propose to adopt a new airworthiness directive (AD) for certain Model CN-235-100, CN-235-200, and CN-235-300 airplanes. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated 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:
EADS-CASA received reports of engine condition control cable * * * failures that, in one of the cases, occurred during the starting phase of one engine which led to an engine shut down following the procedures described within the Aircraft Operation Manual.
The investigation revealed that the cable failure is due to a fracture in the area of the pulley * * *. The root cause of the fracture is an unsuitable ratio between the diameter of the pulley and the cable type and diameter.
This condition, if not detected and corrected, could lead to the engine condition control cable failure and consequent runway excursion if it occurs during take-off or reduced control of the aeroplane if it occurs during flight.
* * * * *
The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.