Document ID: chunk:federal_register_of_legislation:F2006B04648:body:0
Version: federal_register_of_legislation:F2006B04648
Segment Type: other
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Character Range: 0–893

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Bell Helicopter Textron 412 Series Helicopters

 AD/BELL 412/13 Tail Rotor Trunnion Bearing Housing 9/86

DM

 Applicability: All model 412 S/N 33001 to 33118, 33120 and 33121.
 Requirement: Action in accordance with Bell Alert Service Bulletin No. 412-86-25, Revision A. Compliance:               Part I:              At the next 20 hour inspection and thereafter at each 20 hour inspection until
                 Part II is complied with.

                 Part II: Within 150 hours time in service or 60 days, whichever occurs first after 31 July 1986.

 Background: A trunnion bearing housing end web has been found below specified dimensions.
            Failure of the housing caused excessive tail rotor vibration and loss of control.