COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pilatus Britten-Norman BN-2 Series Aeroplanes AD/BN-2/48 Wing Tip Tank Fuel Contents Transmitter Floats - Inspection Applicability: All models BN-2 Islander with wing tip fuel tanks. Document: Britten Norman SB BN-2/SB 154. 6/83 Compliance: As per requirement document within 100 hours time in service after 31 August 1983. Background: Wing tip fuel tank contents transmitter floats are prone to erosion and require repetitive inspections to prevent fuel system contamination which could result in loss of engine power.