Airworthiness Directive · Amendment 39-9022 · Bell Helicopter Textron, Inc. Helicopters
Bell Helicopter Textron, Inc. Helicopters
This AD applies to Bell Helicopter Textron, Inc. 205A, 205A-1, 205B, 212, 412.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. Model 205A, 205A-1, 205B, 212, and 412 series helicopters, that requires removal and replacement of a certain design main transmission lower planetary spider (spider), and establishes a 2,500 hours time-in-service retirement life for the spider. This amendment is prompted by five failures of the spider that occurred during the manufacturer's fatigue tests. The actions specified by this AD are intended to prevent fatigue failure of the spider, failure of the main transmission, and subsequent loss of control of the helicopter.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
