{"id":"F2006B05226","name":"AD/CESSNA 206/21 Amdt 2 - Turbocharger Thrust Bearing Pin and Centre Housing Assembly","slug":"ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45496,"registerId":"commonwealth-F2006B05226-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/21 Amdt 2 - Turbocharger Thrust Bearing Pin and Centre Housing Assembly","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 206 Series Aeroplanes\n\nAD/CESSNA 206/21\n\nAmdt 2\n\n  \n\nTurbocharger Thrust Bearing Pin and Centre Housing Assembly\n\n  \n4/78\n\nApplicability: Model TU206 fitted with turbochargers Cessna P/N C295001-0101 or Airesearch P/N 4-06610-5 (new) or 406610-9004 (remanufactured) having S/No. prefixes listed in Cessna SL No. SE77-3, Supplement No. 2.\n\nRequirement: Part 1: Turbochargers which have not had Cessna Service Kit No. SK 210-75 incorporated: This kit shall be incorporated by an approved organisation in accordance with Cessna SL No. SE77-3, Supplement No. 3.\n\nPart 2: Turbochargers which have had Cessna Service Kit No. SK210-75 incorporated in the field must be inspected in accordance with Cessna SL No. SE77- 42.\n\nCompliance: Parts 1 and 2: Within 100 hours time in service after 30 April 1978.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 2 of an existing Airworthiness Directive, maintaining the same scope as the original — addressing the specific turbocharger defect in Cessna 206 aircraft. The amendment structure suggests iterative refinement rather than scope expansion."},"complexity_factors":["Short, single-purpose directive with clear applicability criteria","Only 2 defined part numbers and 2 service kit references to track","Simple binary logic: either Part 1 or Part 2 applies based on prior modification status","Single compliance deadline (100 hours time in service after fixed date)","No nested exceptions or conditional sub-clauses","Requires cross-referencing to external Cessna Service Letters (SE77-3 Supplements 2 & 3, and SE77-42) for full technical details"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific repairs and inspections on certain Cessna 206 aircraft engines.\n\n**What it does:**\n- Targets Cessna 206 model TU206 aeroplanes fitted with specific turbocharger models (Cessna P/N C295001-0101 or Airesearch P/N 4-06610-5 or 406610-9004)\n- Only applies to turbochargers with specific serial number prefixes listed in Cessna Service Letter SE77-3, Supplement No. 2\n\n**Two-part requirement:**\n- **Part 1:** If the turbocharger hasn't been repaired with \"Cessna Service Kit No. SK 210-75\" — this kit must be installed by an approved maintenance organisation, following Cessna's instructions in Service Letter SE77-3, Supplement No. 3\n- **Part 2:** If the kit was already installed in the field (not at factory) — the turbocharger must be inspected following Cessna Service Letter SE77-42\n\n**Deadline:** Both actions must be completed within 100 hours of flight time after 30 April 1978.\n\n**Why it matters:** This directive addresses a safety defect in the turbocharger's thrust bearing pin and centre housing assembly — critical components that could fail in flight. Airworthiness directives are legally binding; aircraft cannot fly legally until compliance is achieved."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This entry is labelled \"Amdt 2\", indicating it amends the earlier AD. The amended directive specifies two alternative, mutually exclusive compliance paths (fit Service Kit SK 210-75 by an approved organisation if the kit has not been fitted; inspect turbochargers that had the kit fitted in the field) and ties applicability to serial-number prefixes listed in Cessna SL No. SE77-3, Supplement No. 2. It therefore alters the directive’s operative requirements and the practical compliance routing compared with the prior version by prescribing the kit-incorporation route, the inspection route, the responsible party for incorporation (approved organisation), the exact service-letter references to be followed, and the compliance time limit (100 hours after 30 April 1978)."},"complexity_factors":["Cross-reference to serial-number prefixes in an external Cessna Service Letter (SE77-3, Supplement No. 2) (Applicability)","Two distinct required actions depending on past modification status (Part 1 vs Part 2) (Requirement)","Mandate that kit incorporation be performed by an \"approved organisation\" (creates supplier constraint) (Requirement: Part 1)","Dependence on procedures contained in separate Cessna service letters (SE77-3 Supplement No. 3 and SE77-42) for technical detail (Requirement)","A short, fixed compliance window measured in flight hours after a specified date (100 hours after 30 April 1978) (Compliance)"],"plain_english_summary":"This AD requires owners of Cessna TU206 aeroplanes with the listed Cessna or Airesearch turbochargers (serial-prefixes in Cessna SL SE77‑3 Suppl. 2) to either have Service Kit SK 210‑75 installed by an approved organisation or, if the kit was already fitted in the field, have the turbocharger inspected per Cessna SL SE77‑42. Work and costs fall to operators and must be done within 100 hours TIS after 30 April 1978."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly","history":"/api/acts/ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly/history","analysis":"/api/acts/ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly/analysis","conflicts":"/api/acts/ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly/conflicts","importantCases":"/api/acts/ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly/important-cases","documents":"/api/acts/ad-cessna-206-21-amdt-2-turbocharger-thrust-bearing-pin-and-centre-housing-assembly/documents"}}