{"id":"F2006B08647","name":"AD/CON/70 - Carburettor Air Intake Housing","slug":"ad-con-70-carburettor-air-intake-housing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51700,"registerId":"commonwealth-F2006B08647-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CON/70 - Carburettor Air Intake Housing","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nTeledyne Continental Motors Piston Engines\n\nAD/CON/70 Carburettor Air Intake Housing 1/94\n\nApplicability: Teledyne Continental Motors (TCM) C85, C90, O-200A, O-200B and O-240 model engines as detailed in TCM Critical Service Bulletin Number CSB93-13.\n\nNote: This Directive is only applicable to TCM C85, C90, O-200A, O-200B and O- 240 engines fitted with carburettor air intake housing assemblies or P/N 641689 repair kit assemblies that were purchased from TCM between the dates of 1 September 1991 and 30 June 1993, and certain O-200A engines listed by serial number in CSB93-13.\n\nRequirement: Action in accordance with Teledyne Continental Motors Critical Service Bulletin Number CSB93-13.\n\nNote: FAA Airworthiness Directive 93-22-05 refers.\n\nCompliance: Effective 6 January 1994:\n\nINSPECTION PROCEDURE: Within 10 hours time in service and thereafter at intervals not to exceed 25 hours time in service until the carburettor air intake housing is replaced.\n\nREPLACEMENT INSTRUCTIONS: Prior to installation in an aircraft.\n\nNote: Replacement of the affected carburettor air intake housing is the terminating action for this Directive.\n\nBackground: This Directive requires the inspection, and removal from service, of certain carburettor air intake housings purchased from the manufacturer during the period September 1991 to June 1993. The requirement follows advice of cracks found in the affected air intake housings which could result in the loss of engine power due to the separation of the air valve or pieces of it.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific manufacturing defect in a specific batch of carburettor air intake housings. The scope has not expanded beyond the original safety issue identified in 1993."},"complexity_factors":["Single, clearly defined applicability criteria based on engine model, part numbers, and date ranges","Straightforward two-step compliance requirement (repeated inspection + eventual replacement)","Only one cross-reference to an external document (FAA Airworthiness Directive 93-22-05)","Minimal defined terms (only standard aviation terminology like 'time in service')","No nested exceptions or conditional logic — the 'Note' about serial numbers is the only qualifier","Short document (approximately 250 words) with clear structure"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of light aircraft with certain Teledyne Continental Motors piston engines (affected C85, C90, O‑200A/B, O‑240 engines and specified O‑200A serials) to address carburettor air intake housings sold between 1 Sep 1991 and 30 Jun 1993 that can crack and cause the air valve to detach and the engine to lose power.\n\nIt requires prompt inspections at short intervals until the defective housing is replaced; replacing the part is terminating action to prevent in‑flight engine failure."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to the engines, parts purchased between 1 September 1991 and 30 June 1993, and listed O‑200A serial numbers specified in the text and CSB93-13. The source contains no indication the scope was altered from that specification."},"complexity_factors":["Narrow, specific applicability by engine model, purchase dates and listed serial numbers (Applicability; Note).","Short follow-up inspection cadence: initial inspection within 10 hours, then every 25 hours until replacement (Compliance: INSPECTION PROCEDURE).","Mandatory replacement before installation and replacement as terminating action reduces ongoing compliance once completed (Compliance: REPLACEMENT INSTRUCTIONS; Note).","Dependence on manufacturer instructions — actions must follow TCM Critical Service Bulletin CSB93-13 (Requirement).","Cross-reference to FAA AD 93-22-05 indicates alignment with foreign regulator guidance (Note).","Compliance imposes direct operational costs on aircraft owners/operators for inspections, part replacement and downtime (Compliance; Background).","Safety trigger documented: cracking risk that could cause separation of the air valve and loss of engine power (Background)."],"plain_english_summary":"This airworthiness directive requires owners/operators of specified Teledyne Continental piston engines (C85, C90, O-200A/B and O-240) fitted with certain carburettor air intake housings bought between 1 Sep 1991 and 30 Jun 1993 (and particular O‑200A serial numbers) to inspect and remove affected housings. Inspections start within 10 hours and recur every 25 hours until the housing is replaced; replacement before installation is the terminating action. The measure responds to reported cracks that could lead to loss of engine power."}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-70-carburettor-air-intake-housing","history":"/api/acts/ad-con-70-carburettor-air-intake-housing/history","analysis":"/api/acts/ad-con-70-carburettor-air-intake-housing/analysis","conflicts":"/api/acts/ad-con-70-carburettor-air-intake-housing/conflicts","importantCases":"/api/acts/ad-con-70-carburettor-air-intake-housing/important-cases","documents":"/api/acts/ad-con-70-carburettor-air-intake-housing/documents"}}