Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require the installation of an accessory gearbox (AGB) axis-A oil slinger nut to the axis-A shaft assembly. This proposed AD was prompted by four reports of unrecoverable engine stalls, during hover in a left-roll attitude. We are proposing this AD to prevent an unrecoverable engine stall, leading to a helicopter forced landing or accident.