COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 146 Series Aeroplanes AD/BAe 146/70 Skin Inspection at Frame 29 between Stringers 12 and 13 8/98 Applicability: All BAe 146 Series 100 and 200 aircraft, and Series 300 aircraft with constructors numbers listed in effectivity of SB 53-144. Requirement: Inspect in accordance with British Aerospace Mandatory Service Bulletin 53-144, classified mandatory by UK CAA. Compliance: As specified in the Requirement document. This airworthiness directive becomes effective on 16 July 1998. Background: Fatigue cracking of the skin in the vicinity of frame 29 between stingers 12 and 13 has been found on two aircraft during routine inspection.