{"id":"F2006B05217","name":"AD/CESSNA 206/12 Amdt 4 - Aft Tailcone Assembly","slug":"ad-cessna-206-12-amdt-4-aft-tailcone-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45467,"registerId":"commonwealth-F2006B05217-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/12 Amdt 4 - Aft Tailcone Assembly","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Cessna 206 Series Aeroplanes\n\n \n\nAD/CESSNA 206/12\n\nAmdt 4\n\n\nAft Tailcone Assembly 12/85\n\n \n\nApplicability: All model 206 Series Serial Nos. P2060001 to P2060647 and U2060001 to U20601905.\n\n \n\nRequirement: Action in accordance with Cessna S.L. SE72-29. Compliance:  As detailed in the requirement document.\n\nNote: Inspections carried out in accordance with the previous issues of this Directive may be taken as meeting the requirements of Cessna SL SE72-3.\n\n \n\nBackground: This Directive is amended to reflect the manufacturer’s modification to the subject structure during production of aircraft with subsequent serial numbers.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD remains tightly scoped to its original purpose: ensuring structural integrity of Cessna 206 tailcones. Amendment 4 merely updates the directive to account for production-line design changes by the manufacturer — it does not expand the aircraft types covered, add new systems, or broaden the safety mandate beyond the aft tailcone assembly."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 defined applicability ranges (serial number blocks)","Single cross-reference to external document (Cessna S.L. SE72-29)","No nested conditions or exceptions — straightforward 'do what the manufacturer says' requirement","One simple grandfathering note for prior compliance","No interpretive provisions, penalty clauses, or procedural machinery in the excerpt"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires owners or operators of specific aircraft to take corrective action.\n\n**What it does:**\n- **Targets:** Cessna 206 series aeroplanes (specific serial numbers from P2060001 to P2060647 and U2060001 to U20601905)\n- **Requires:** Inspection or modification of the **aft tailcone assembly** (the rear structural section of the aircraft fuselage) following the manufacturer's instructions in Cessna Service Letter SE72-29\n- **Compliance:** Must be done exactly as specified in that service letter\n\n**Why it matters:**\n- **Safety-critical:** The tailcone is a vital structural component. Failures here could lead to loss of control or structural collapse in flight\n- **Mandatory:** Unlike recommendations, ADs are legally enforceable. Non-compliance grounds the aircraft\n- **Updated:** This is Amendment 4, reflecting design changes Cessna made during production for newer aircraft — meaning older planes need retrofitting to match improved standards\n\n**Key relief:** If you already did inspections under earlier versions of this AD, those count — you don't need to redo work already completed"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Directive has been amended to reflect a manufacturer modification to the aft tailcone structure introduced during later production (see \"Background\"). The current text sets explicit applicability by serial number (P2060001–P2060647 and U2060001–U20601905), and notes that earlier inspections compliant with Cessna SL SE72-3 may be accepted (see \"Applicability\" and \"Note\"). Together these provisions indicate the AD's scope was updated to account for changes in production configuration and to clarify which serial-numbered aircraft the service requirement applies to."},"complexity_factors":["Reference to an external technical document (Cessna S.L. SE72-29) for the substantive requirements increases practical complexity because the AD does not include technical steps (see \"Requirement\").","Serial-number-limited applicability requires owners/operators to check aircraft identity against the listed ranges, which adds administrative complexity (see \"Applicability\").","The AD delegates compliance detail to the external service letter and states compliance is ‘as detailed in the requirement document’, so enforcement and verification will rely on that external material (see \"Compliance\").","A note permitting earlier inspections under Cessna SL SE72-3 to meet requirements introduces a recognition/acceptance rule that affects recordkeeping and compliance assessment (see \"Note\").","Background amendment referencing manufacturer production changes affects scope and requires reconciliation between older and newer production aircraft histories (see \"Background\")."],"plain_english_summary":"This AD requires owners and operators of specified Cessna 206 serial-numbered aeroplanes to inspect and, if necessary, repair or modify the aft tailcone assembly by following Cessna Service Letter SE72-29, making the manufacturer's instructions mandatory. Maintenance organisations and engineers who service those aircraft are likewise bound.\n\nIt updates applicability to reflect a later-production tailcone change, accepts earlier inspections done to SL SE72-3 where applicable, and places compliance costs on owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-12-amdt-4-aft-tailcone-assembly","history":"/api/acts/ad-cessna-206-12-amdt-4-aft-tailcone-assembly/history","analysis":"/api/acts/ad-cessna-206-12-amdt-4-aft-tailcone-assembly/analysis","conflicts":"/api/acts/ad-cessna-206-12-amdt-4-aft-tailcone-assembly/conflicts","importantCases":"/api/acts/ad-cessna-206-12-amdt-4-aft-tailcone-assembly/important-cases","documents":"/api/acts/ad-cessna-206-12-amdt-4-aft-tailcone-assembly/documents"}}