COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/3 Pneumatic Air Supply PRSOV Actuator Linkage - Inspection and Modification 7/85 TX Applicability: All models equipped with Pressure Regulating and shut off Valves Part Nos. 773288- 4 and 773288-5. Requirement: Boeing Alert Service Bulletin 767-36A0015. Compliance: As detailed in the requirement document. Background: The manufacturer has reported an incident where a failure of the PRSOV caused the pneumatic ducting to be subjected to high pressure air. Considerable damage resulted and jamming of the flap and breakage of the throttle control occurred.