COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 737 Series Aeroplanes AD/B737/51 Outboard Flap Forward Support Fitting Attach Bolts 2/91 Applicability: Model 737-200, -300 and -400 listed in the Requirement document. Requirement: Action in accordance with the technical requirements of FAA AD 90-24-04 Amdt 39- 6809. Note: Boeing Alert SB 737-57A1206 and Alert SB 737-57A1208 refer. Compliance: As specified in the Requirement document with effective date 24 December 1990. Background: Country of origin AD. Fastener fracture in fitting attachment could result in loss of outboard flap.