COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 3100 (Jetstream) Series Aeroplanes AD/JETSTREAM/2 Propeller Ice and Rain Protection - Modification Applicability: Jetstream Series 3100 aircraft. Constructors numbers 601 to 645. Requirement: Service Bulletin 30-JM7453 Revision 1. Compliance: Before further flight after 31 May 1985. 1/85 Background: The manufacturer has introduced a revised propeller de-icing system to resolve the problems of induced vibrations occuring during icing encounters at low ambient temperatures.