COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes AD/HS 748/21 Corrosion Prevention and Control Program 10/96 Applicability: British Aerospace HS 748 aircraft. Requirement: Action in accordance with Jetstream Aircraft Corrosion Prevention and Control Programme document Reference JS/CPCP/02 dated 1 April 1996. Note: UK CAA AD 002-04-96 refers. Compliance: At the thresholds specified in the Requirement Document. Background: The Country of Origin Airworthiness Authority requires implementation of a corrosion prevention and control program to prevent the degradation of the structural capabilities of the affected aircraft.