{"id":"F2006B08099","name":"AD/CESSNA 210/50 Amdt 1 - Engine and Turbocharger Installation - Checks and Modification","slug":"ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115209,"registerId":"commonwealth-F2006B08099-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 210/50 Amdt 1 - Engine and Turbocharger Installation - Checks and Modification","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 210 Series Aeroplanes\n\nAD/CESSNA 210/50\n\nAmdt 1\n\n  \n\nEngine and Turbocharger Installation \\- Checks and Modification\n\n  \n10/81\n\nApplicability: Model P210N series with S/Nos. P21000001 to P21000690 not incorporating Cessna Service Kit No. SK210-98B.\n\nDocument: 1. CESSNA SIL No. SE 81-35 and Supplement No. 1 or 2. FAA AD 81-15-05, Amendment No. 39-4168.\n\nCompliance: Within 200 hours time in service after 31 October, 1981.\n\nBackground: This directive was originally issued to reduce the possibility of engine overheating and detonation caused by excessively lean mixtures during high power operation. It has been amended to increase the range of serial numbers of affected aircraft and to further reduce the possibility of detonation by additional modifications. Climb performance is also improved as the result of these modifications.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expanded the range of affected aircraft serial numbers and added further modification requirements. Originally the directive targeted reduction of engine overheating and detonation risk caused by lean mixtures; the amendment retains that stated purpose while increasing the number of aircraft covered and prescribing additional modifications that the AD says further reduce detonation risk and improve climb performance. (See: Background)"},"complexity_factors":["Narrow applicability defined by specific model and serial-number range (P210N, S/N P21000001–P21000690) increases target precision but reduces scope breadth (Applicability).","Conditional exemption if Cessna Service Kit SK210-98B is already incorporated, creating a binary compliance test (Applicability).","Fixed compliance deadline expressed as a time-in-service window (200 hours after 31 October 1981) imposes scheduling and operational constraints (Compliance).","Dependence on external technical documents (CESSNA SIL SE 81-35 and Supplement No. 1 or 2; FAA AD 81-15-05) means substantive implementation detail is in referenced materials (Document).","Mandate covers both inspections (‘checks’) and physical changes (‘modifications’), which can vary in labour, parts and downtime requirements (Background; Document).","Amendment history expands serial-number coverage and adds further modification requirements, introducing change management considerations for operators and maintainers (Background)."],"plain_english_summary":"This AD mandates specific engine and turbocharger checks and modifications for Cessna Model P210N aeroplanes serial P21000001–P21000690 that do not already have Service Kit SK210-98B. Owners/operators must complete the referenced Cessna/FAA procedures within 200 flight hours after 31 Oct 1981.\n\nThe rule aims to reduce engine overheating and detonation risk and improve climb performance; compliance costs, parts and downtime are the operator’s responsibility."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive, but it remains tightly scoped to its original safety purpose. The amendment slightly expands the serial number range of affected aircraft and adds supplementary modifications, but this is consistent with the original intent of preventing engine overheating and detonation. There is no scope creep into unrelated aircraft systems or operational areas."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined elements: applicability (specific model/serial range), compliance deadline, referenced documents, and background rationale","Single condition for exclusion (Service Kit SK210-98B already installed)","No nested exceptions or conditional logic — straightforward applicability test","Clear, unambiguous compliance deadline (200 hours time in service after fixed date)","References external technical documents but does not incorporate them by full text — simple pointer structure"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft.\n\n**What it does:**\n- Requires owners/operators of specific Cessna 210 aircraft to perform **checks and modifications** to the engine and turbocharger installation.\n- The goal is to **prevent engine overheating and detonation** (dangerous uncontrolled fuel burning that can damage engines) caused by fuel mixtures that are too lean during high-power operations.\n- The amendment expands the number of affected aircraft (more serial numbers) and adds extra modifications to further reduce detonation risk. As a bonus, these changes also improve climb performance.\n\n**Who it affects:**\n- Owners and operators of **Cessna P210N model aircraft** with serial numbers P21000001 through P21000690.\n- **Excludes** aircraft that already have **Cessna Service Kit SK210-98B** installed.\n\n**Why it matters:**\n- **Safety critical:** Engine overheating and detonation can cause catastrophic engine failure in flight.\n- **Legally mandatory:** Compliance is required within **200 hours of flight time** after 31 October 1981. Operating without compliance violates civil aviation regulations.\n- **Traceable requirements:** The directive references specific Cessna service documents and a US Federal Aviation Administration (FAA) directive, meaning mechanics must follow those exact technical procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification","history":"/api/acts/ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification/history","analysis":"/api/acts/ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification/analysis","conflicts":"/api/acts/ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification/conflicts","importantCases":"/api/acts/ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification/important-cases","documents":"/api/acts/ad-cessna-210-50-amdt-1-engine-and-turbocharger-installation-checks-and-modification/documents"}}