Background
CurrentBackground
Background Background
The manufacturer has revised the procedures for determining the retirement life of the main rotor mast and spline plate for the 412 and 412SP, which now has a retirement life of 10,000 hours or 80,000 maximum Retirement Index Numbers (RIN), whichever occurs first. For the 412HP and 412EP the retirement life is 10,000 hours or 60,000 RIN, whichever occurs first.
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