COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-18 and 19 (Super Cub) Series Aeroplanes AD/PA-18/9 Fuel Management Placards - Installation 9/77 Applicability: All models certificated in Agricultural and Normal/Agricultural categories. Requirement: 1. Install a placard adjacent to the fuel selector redesignating the Left Tank as the Main Tank and the Right Tank as the Auxiliary Tank. 2. Install the following placard on the instrument panel: "FOR ALL AGRICULTURAL OPERATIONS USE THE MAIN FUEL TANK ONLY" Compliance: Within 100 hours time in service after 30 September 1977.