{"id":"F2006B04925","name":"AD/CESSNA 150/27 - Seat Frame","slug":"ad-cessna-150-27-seat-frame","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44770,"registerId":"commonwealth-F2006B04925-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/27 - Seat Frame","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 150, F150, 152 & F152 Series Aeroplanes\n\n \n\nAD/CESSNA 150/27 Seat Frame 2/78\n\nApplicability: All model 150 Aerobat Series with S/Nos. A1500277 to A1500647, and FRA1500167 to FRA1500291.\n\n \n\nRequirement: Action in accordance with Cessna SL SE 77-40. Compliance:  Within 100 hours time in service after 28 February 1978.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2014},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains tightly scoped to its original purpose: addressing a specific airworthiness defect in seat frames of particular Cessna 150 Aerobat aircraft. There is no evidence of scope creep or expansion beyond this technical safety issue."},"complexity_factors":["Single, unambiguous requirement with no nested conditions or exceptions","No defined terms or interpretation section","Limited applicability restricted to specific aircraft serial number ranges","Relies on external technical reference (Cessna Service Letter SE 77-40) rather than detailed legislative text"],"plain_english_summary":"**What this does:** This is a mandatory safety notice (called an **Airworthiness Directive**) that orders owners and operators of specific Cessna 150 Aerobat aircraft to inspect or repair the pilot/passenger seat frames to prevent potential failure.\n\n**Who it affects:** Only applies to Cessna 150 Aerobat models with serial numbers between **A1500277–A1500647** and **FRA1500167–FRA1500291**.\n\n**What must be done:** Follow the technical instructions in **Cessna Service Letter SE 77-40** (a manufacturer bulletin that details the specific seat frame work required).\n\n**When:** The work must be completed within **100 hours of flight time** after 28 February 1978.\n\n**Why it matters:** Faulty seat frames in aerobatic aircraft pose a serious safety risk during high-G maneuvers; this directive ensures the structural integrity of the seating."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-27-seat-frame","history":"/api/acts/ad-cessna-150-27-seat-frame/history","analysis":"/api/acts/ad-cessna-150-27-seat-frame/analysis","conflicts":"/api/acts/ad-cessna-150-27-seat-frame/conflicts","importantCases":"/api/acts/ad-cessna-150-27-seat-frame/important-cases","documents":"/api/acts/ad-cessna-150-27-seat-frame/documents"}}