Document ID: chunk:federal_register_of_legislation:F2006B04699:body:0
Version: federal_register_of_legislation:F2006B04699
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Bell Helicopter Textron 47 (All Variants) Series Helicopters

AD/BELL 47/75
 Amdt 2

 Applicability: All models.

 Control Tubes 10/86

             Requirement: 1. Visually inspect the control tubes referenced in Bell SB 47-11-73-1 and Kawasaki- Bell S.B. KSB-Bell 334 for evidence of corrosion pits, particularly in the lower four (4) inches of each tube assembly; or

2.    Inspect the control tubes referenced in Bell SB 47-11-73-1 and Kawasaki-Bell S.B. KSB-Bell 334 for evidence of corrosion using a suitable radiographic technique; or

3.    Remove the lower end fittings from the control tubes and visually inspect the internal surface of the tube for evidence of corrosion.

             Compliance: 1. Within 25 hours time in service after 31 December 1973 and thereafter at intervals not exceeding 50 hours time in service.

                2 & 3. Within 25 hours time in service after 31 December 1973 and thereafter at intervals not exceeding 3 years.

            Background: The manufacturer has received reports of failure of fore and aft control tubes caused by corrosion. This Directive has been amended to include Kawasaki-Bell Helicopters.