COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 737 Series Aeroplanes AD/B737/49 Outboard Flaptrack Support Fitting Attach Bolts 12/90 Applicability: Models 737 with line numbers 1 through 324. Requirement: Action in accordance with the technical requirements of FAA AD 90-17-20 Amdt 39- 6707. Note: Boeing SB 737-57A1079 Rev 4 refers. Compliance: In accordance with the Requirement document, except that the effective date of this AD is 29 November 1990. Background: Country of origin AD. Failure of the subject bolts could result in loss of the flap and consequent control difficulties.