COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Instruments and Automatic Pilots AD/INST/27 Airborne Vacuum Pumps - Removal From Service 7/79 Applicability: AIRBORNE P/NO. SERIAL NUMBER 211CC 5E9318 to 5E9347 and 5E9407 to 5E11419. 211CC-9 5E616 to 5E715. 211CC TR 5E1264 to 5E1406. 212CW 5E3403 to 5E4197 and 5E9129E to 5E9131E. 212CW-6 5E9 to 5E25. 242CW-4 5E8 to 5E11. 441CC 5E332 to 5E401 and 5E450 to 5E483. 441CC-7 5E911 to 5E981. 441CC-9 5E75 to 5E80. 441CC-11 5E4. 441CC-13 5E7 to 5E12. 441CC-17 5E106 to 5E116. 442CW 5E926 to 5E1023. 442CW-4 5E137 to 5E149. 442CW-6 5E765 to 5E785. 442CW-8 5E114. 442CW-12 5E431 to 5E435. Requirement: Remove from service the above listed Airborne Aviation Products dry air (vacuum) pumps and replace with a serviceable item. Note: An airworthy pump is one with a serial number not listed above or, if listed above, also has an "A" or "2" ink stamped by the manufacturer in black ink on the periphery of the body near the mounting flange. (FAA Emergency AD dated 7 June 1979 refers). Compliance: For new aircraft : Before Certification. For aircraft already certificated : Within 100 hours time in service after 31 July 1979.