COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
DHC-6 (Twin Otter) Series Aeroplanes
AD/DHC-6/70 Horizontal Stabiliser - Centre Hinge Bracket Flange 5/95
Applicability: All DHC-6 Model aircraft.
Requirement: Fluorescent dye penetrant inspect all flanges of Horizontal Stabiliser Hinge Bracket P/N C6TPM1021. Inspect in accordance with de Havilland Canada Service Bulletin 6/512 Revision 1.
Note: Transport Canada AD CF-92-05 refers.
Compliance: Initially inspect within 250 hours time in service after 27 April 1995. Re-inspect at intervals not to exceed 1200 hours time in service.
The repeat inspections are required regardless of hinge bracket replacement.
Background: In-service cracking has been reported in the horizontal stabiliser centre hinge bracket flange.