{"id":"F2006B10829","name":"AD/INST/27 - Airborne Vacuum Pumps - Removal From Service","slug":"ad-inst-27-airborne-vacuum-pumps-removal-from-service","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56307,"registerId":"commonwealth-F2006B10829-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/27 - Airborne Vacuum Pumps - Removal From Service","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nInstruments and Automatic Pilots\n\nAD/INST/27 Airborne Vacuum Pumps \\- Removal From Service 7/79\n\nApplicability: AIRBORNE P/NO. SERIAL NUMBER\n\n211CC 5E9318 to 5E9347 and 5E9407 to 5E11419. 211CC-9 5E616 to 5E715.\n\n211CC TR 5E1264 to 5E1406. 212CW 5E3403 to 5E4197 and 5E9129E to 5E9131E.\n\n212CW-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.\n\n441CC-13 5E7 to 5E12. 441CC-17 5E106 to 5E116. 442CW 5E926 to 5E1023.\n\n442CW-4 5E137 to 5E149. 442CW-6 5E765 to 5E785. 442CW-8 5E114. 442CW-12\n\n5E431 to 5E435.\n\nRequirement: Remove from service the above listed Airborne Aviation Products dry air (vacuum) pumps and replace with a serviceable item.\n\nNote: 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).\n\nCompliance: For new aircraft : Before Certification.\n\nFor aircraft already certificated : Within 100 hours time in service after 31 July 1979.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1979 addressing a specific defective aircraft component. It has not expanded beyond its original purpose of grounding specific vacuum pump serial numbers."},"complexity_factors":["Single, unambiguous operative requirement ('Remove from service... and replace')","Clear applicability table with specific part numbers and serial number ranges","Simple two-tier compliance structure (new vs existing aircraft)","One explanatory note with straightforward visual inspection criterion ('A' or '2' stamp)","No defined terms section, no cross-references to other legislation, no conditional exceptions","Total length: approximately 200 words"],"plain_english_summary":"This Airworthiness Directive requires immediate removal from service of specified Airborne Aviation Products dry air (vacuum) pumps used to power critical flight instruments, because failures can cause complete instrument loss. It affects aircraft owners/operators with listed pump models and serial-number ranges.\n\nAffected pumps must be replaced (new aircraft before certification; existing aircraft within 100 flight hours after 31 July 1979). A pump on the list is only acceptable if it bears a manufacturer’s \"A\" or \"2\" stamped nearby."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument's scope is limited to the listed Airborne Aviation Products dry air (vacuum) pumps and prescribes their removal and replacement within specified deadlines. The text contains no indication of an expanded or reduced scope beyond that stated requirement."},"complexity_factors":["Applicability defined by many part numbers and multiple contiguous and non-contiguous serial-number ranges — administrative tracking required.","Serviceability exception depends on manufacturer ink stamp ('A' or '2') near the mounting flange — physical inspection and verification needed.","Different compliance deadlines for new aircraft (Before Certification) and certificated aircraft (within 100 hours after 31 July 1979) — coordination with maintenance/certification schedules.","Replacement obligation imposes direct cost on aircraft owners/operators — economic compliance burden.","Reference to FAA Emergency AD — cross-jurisdictional technical reliance that may require checking external documentation.","Enforcement linked to certification status and in-service time — interaction with regulatory oversight and recordkeeping."],"plain_english_summary":"This airworthiness directive requires owners/operators to remove specific Airborne Aviation Products dry air (vacuum) pumps (listed by part and serial number) and replace them with a serviceable unit. A pump is serviceable if its serial number is not listed or, if listed, has an \"A\" or \"2\" ink stamp by the manufacturer near the mounting flange.\n\nThe Civil Aviation Safety Authority requires removal before certification of new aircraft and within 100 hours time-in-service after 31 July 1979 for certificated aircraft. Owners/operators pay replacement costs and must record and verify compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-27-airborne-vacuum-pumps-removal-from-service","history":"/api/acts/ad-inst-27-airborne-vacuum-pumps-removal-from-service/history","analysis":"/api/acts/ad-inst-27-airborne-vacuum-pumps-removal-from-service/analysis","conflicts":"/api/acts/ad-inst-27-airborne-vacuum-pumps-removal-from-service/conflicts","importantCases":"/api/acts/ad-inst-27-airborne-vacuum-pumps-removal-from-service/important-cases","documents":"/api/acts/ad-inst-27-airborne-vacuum-pumps-removal-from-service/documents"}}