{"id":"F2006B08072","name":"AD/CESSNA 210/22 - Intercostal Bulkhead - Reinforcement","slug":"ad-cessna-210-22-intercostal-bulkhead-reinforcement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115165,"registerId":"commonwealth-F2006B08072-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 210/22 - Intercostal Bulkhead - Reinforcement","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 210 Series Aeroplanes\n\n \n\nAD/CESSNA 210/22 Intercostal Bulkhead - Reinforcement 10/72\n\nApplicability: All models with S/Nos. 21058819 to 21059030 and T210- 0198 to T210-0378. Document:               Cessna SL SE72-22.\n\nCompliance: Within 100 hours time in service after 31 August 1972.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1972 addressing a specific structural reinforcement requirement. It has not expanded beyond its original purpose of mandating a safety modification to specific Cessna 210 aircraft."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — all language is plain technical aviation terminology","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Single, unambiguous compliance requirement (reinforce per Cessna SL SE72-22 within 100 hours)","No conditional logic, exceptions, or nested provisions","Clear applicability criteria using specific serial number ranges"],"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 specific repairs or inspections on aircraft.\n\n**What it does:** It orders owners and operators of certain **Cessna 210 series aeroplanes** to reinforce the \"intercostal bulkhead\" — a structural part of the aircraft's frame located between the ribs (the \"intercostal\" spaces). The reinforcement must be done according to Cessna Service Letter SE72-22.\n\n**Who it affects:** Owners and operators of Cessna 210 models with specific serial numbers:\n- Serial numbers 21058819 through 21059030\n- Serial numbers T210-0198 through T210-0378\n\n**When it had to be done:** Within 100 hours of flying time after 31 August 1972.\n\n**Why it matters:** Airworthiness Directives are legally binding safety measures. They typically issue when a design flaw or wear pattern is discovered that could affect flight safety. Failing to comply means the aircraft cannot legally fly in Australian airspace."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to the specific serial-number ranges listed and prescribes a single retrofit action to be carried out according to the referenced service letter within a fixed time window. The text provided does not indicate any change to that scope from an earlier or different intent."},"complexity_factors":["Narrow and specific applicability by serial-number ranges (limits affected population but requires precise identification).","Technical nature of the required work (intercostal bulkhead reinforcement) which likely requires specialist maintenance skills and parts.","Dependence on an external manufacturer document (Cessna SL SE72-22) for procedural detail; the directive itself does not include step-by-step instructions.","Fixed and relatively short compliance window (within 100 hours time in service after a specified date), creating scheduling pressure for operators.","Lack of operational detail in the directive (no penalties, no parts list), increasing reliance on third-party (manufacturer/maintenance organisation) interpretation and execution."],"plain_english_summary":"The Civil Aviation Safety Authority directive AD/CESSNA 210/22 mandates a physical reinforcement of the intercostal bulkhead on specific Cessna 210 (S/N 21058819–21059030) and T210 (S/N T210‑0198–T210‑0378) aircraft. Affected owners/operators must complete the Cessna Service Letter SE72‑22 procedure within 100 hours time‑in‑service after 31 August 1972; costs, parts, labour and downtime fall to them. The directive references the manufacturer document for technical steps and does not state penalties."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-210-22-intercostal-bulkhead-reinforcement","history":"/api/acts/ad-cessna-210-22-intercostal-bulkhead-reinforcement/history","analysis":"/api/acts/ad-cessna-210-22-intercostal-bulkhead-reinforcement/analysis","conflicts":"/api/acts/ad-cessna-210-22-intercostal-bulkhead-reinforcement/conflicts","importantCases":"/api/acts/ad-cessna-210-22-intercostal-bulkhead-reinforcement/important-cases","documents":"/api/acts/ad-cessna-210-22-intercostal-bulkhead-reinforcement/documents"}}