COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes AD/TSA-600/28 Fuel Pressure Gauge - Modification 11/80 Applicability: Model 601 and 601P series. Requirement: Mark the left hand and right hand engine fuel pressure gauges with a yellow arc over the 12 psi to 18 psi range. Note: FAA AD 80-18-03 Amdt. 39-3900 refers. Compliance: Within 100 hours time in service after 30 November 1980. Background: This directive is issued to prevent possible engine failures due to excessively lean fuel/air mixture operation and supplements corresponding flight manual amendment.