COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES SAAB SF340 Series Aeroplanes AD/SF340/34 Dual Pressure Indicator 7/92 Applicability: All model SF340A serial number 003 to 138 inclusive. Requirement: Unless previously carried out action in accordance with SAAB-Scania Service Bulletin SF340-29-004 Revision 1. Note 1: Swedish AD SAD No 1-043 refers. Note 2: FAA AD 92-07-01 amdt 39-8197 refers. Compliance: By 30 June 1993. Background: Reports of aircraft suffering loss of hydraulic pressure, which was not detected by the pilots, have been received. This has resulted in several aircraft taxiing with nose wheel steering and brakes inoperative.