COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 60 (Duke) Series Aeroplanes AD/BEECH 60/38 Air Conditioning Compressor Pulley Guard and Retaining Bolt 4/83 Applicability: All models 60, A60 and B60 with S/Nos. P-4 to P-577, P-579 to P-587 and P-589 and P-592. Requirement: Action in accordance with Beechcraft SI No. 1236. Compliance: Within 100 hours' time in service after 30 May 1983. Background: The installation of a compressor pulley guard is considered mandatory by the manufacturer to reduce the possibility of the clutch coming in contact with a fuel line.