Document ID: chunk:federal_register_of_legislation:F2006B06470:body:0:p2
Version: federal_register_of_legislation:F2006B06470
Segment Type: other
Provision Reference: 
Character Range: 2782–4267

NAS6605-31, that has vendor identification marking 01DO on the bolt head, with a serviceable bolt, part number NAS6605- 31, that has an alternative vendor identification marking.

              Bolt part number NAS6605-31 with vendor identification marking 01DO on the bolt head, is not to be installed on any helicopter.

Note 2: FAA Emergency AD 2003-24-51 refers.

Compliance: 1. Before further flight after 3 December 2003.

              2.         At the times specified in Compliance 3 and 4.

              3.         Before further flight after 3 December 2003, and thereafter before first flight of each day of operation.

              4.         Within 10 hours time in service or before 31 December 2003, whichever occurs first; after determination of vendor identification and/or helicopter applicability.

            This Airworthiness Directive becomes effective on 3 December 2003.

            Background: The FAA received a report of the failure of the bolt that secures parts of the main rotor swashplate and attaches the tail rotor blade. Investigation revealed that the bolt failed due to hydrogen embrittlement. Hydrogen embrittlement is suspected to have occurred during the cadmium plating process of an entire batch of bolts, which makes the batch suspect.

 David Villiers
 Delegate of the Civil Aviation Safety Authority 2 December 2003

 The above AD is notified in the Commonwealth of Australia Gazette on 3 December 2003.