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 146/28 Main Landing Gear Lock Jack 3/91 Applicability: All BAe 146 aircraft which have an Uplock Jack part number 104275001 installed with the serial number listed in Dowty Rotol SB 146-32-93. Requirement: Action in accordance with Dowty Rotol Mandatory SB 146-32-93 Rev 1. Note: BAe146 SB 32-103 refers. Compliance: As specified in the Requirement Document. Background: A batch of lock jack assemblies have been manufactured with a forging defect in the bodies. A total of forty one units have been identified as being manufactured from the defective material.