{"id":"F2006B08362","name":"AD/CESSNA 400/79 - Cabin Overhead Bulkhead - Inspection","slug":"ad-cessna-400-79-cabin-overhead-bulkhead-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115770,"registerId":"commonwealth-F2006B08362-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/79 - Cabin Overhead Bulkhead - Inspection","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 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/79 Cabin Overhead Bulkhead - Inspection 3/81\n\nApplicability: All models 441 with S/Nos. 441-0001 to 441-0139. Document:  Cessna Customer Care SIL No. PJ80-13.\n\nCompliance: Within 100 hours time in service after 31 March 1981.\n\n \n\nBackground: Excessive material may have been removed from the cabin overhead bulkheads at FS\n\n185.37 and FS 212.10 to allow installation of air ducts.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2090},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: requiring a one-time inspection of specific structural components on affected aircraft to address a known manufacturing defect. No expansion of scope beyond this safety-critical inspection is evident."},"complexity_factors":["Single, clearly defined inspection task","Limited applicability to one aircraft model and specific serial number range","Simple compliance deadline (100 hours time in service after fixed date)","No exceptions, conditional clauses, or nested provisions","Refers to external technical document for procedural details rather than embedding them"],"plain_english_summary":"**What this is**\nThis is an Airworthiness Directive (AD) — a mandatory safety rule issued by the Civil Aviation Safety Authority requiring owners of specific Cessna aircraft to conduct a structural inspection.\n\n**Who is affected**\nOwners and operators of **Cessna 441** model aircraft with serial numbers **441-0001 through 441-0139**.\n\n**What you must do**\nInspect the **cabin overhead bulkheads** (the structural walls in the ceiling area) at two specific frame stations (FS 185.37 and FS 212.10). This inspection must be completed within **100 hours of flight time** after 31 March 1981.\n\n**Why this matters**\nDuring production or past maintenance, excessive material may have been removed from these bulkheads to install air conditioning ducts. This could compromise the aircraft's structural integrity and safety.\n\n**How to comply**\nFollow the detailed inspection procedures in **Cessna Customer Care Service Information Letter (SIL) No. PJ80-13**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-79-cabin-overhead-bulkhead-inspection","history":"/api/acts/ad-cessna-400-79-cabin-overhead-bulkhead-inspection/history","analysis":"/api/acts/ad-cessna-400-79-cabin-overhead-bulkhead-inspection/analysis","conflicts":"/api/acts/ad-cessna-400-79-cabin-overhead-bulkhead-inspection/conflicts","importantCases":"/api/acts/ad-cessna-400-79-cabin-overhead-bulkhead-inspection/important-cases","documents":"/api/acts/ad-cessna-400-79-cabin-overhead-bulkhead-inspection/documents"}}