COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DH 82 (Tiger Moth) Series Aeroplanes AD/DH 82/9 Amdt 1 Datum Bolts 10/98 Applicability: Model DH82 and DH82A Moth aircraft. Requirement: Action in accordance with British Aerospace Technical News Sheet CT (Moth) No. 28 Issue 2. Note: UK CAA AD 002-10-97 refers. Compliance: Unless already accomplished, within 25 hours time in service after 10 September 1998, or before 10 December 1998, whichever occurs first. This amendment becomes effective on 10 September 1998. Background: Moth aircraft have special bolts installed at certain fuselage joints which serve as "datum pins" when rigging the aircraft longitudinally. Although these bolts are similar in appearance, their material specifications differ. This Directive requires an inspection of the bolts installed at joint "E" (on some models) to determine the material specification. Amendment 1 is issued in response to Issue 2 of the Requirement document which introduces an additional one-time inspection and replacement, where necessary, of the fuselage Joint 'E' bolts on the opposite side of the aircraft to the datum bolts, and to allow the use of A25 bolts in lieu of obsolete specification AGS. 749 bolts. The original issue of this airworthiness directive became effective on 12 November 1997.