{"id":"F2006B05009","name":"AD/CESSNA 177/15 - Vertical Fin Forward Attachment Bulkhead","slug":"ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44919,"registerId":"commonwealth-F2006B05009-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 177/15 - Vertical Fin Forward Attachment Bulkhead","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 177 Series Aeroplanes\n\n \n\nAD/CESSNA 177/15 Vertical Fin Forward Attachment Bulkhead 2/74\n\nApplicability: All models 177, 177RG and F177RG with S/Nos. 17700001 to 17701908, 177RG0001 to 177RG0083, F177RG0001 to F177RG0083 and F177RG0091.\n\n \n\nRequirement: Action in accordance with Cessna SL SE73-40.\n\n \n\nCompliance: Within 100 hours time in service after 28 February 1974 and thereafter at intervals not exceeding 100 hours time in service until replaced with the improved bulkhead.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1703},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: mandating repetitive inspections for a specific structural airworthiness issue in defined aircraft models. It has not expanded beyond this safety-critical maintenance requirement."},"complexity_factors":["References external technical document (Cessna Service Letter SE73-40) without reproducing contents","Specific serial number ranges required to determine aircraft applicability","Technical aviation terminology (time in service, bulkhead, vertical fin attachment) assumes domain knowledge"],"plain_english_summary":"This rule requires owners/operators of specified Cessna 177, 177RG, and F177RG airplanes (listed serial ranges) to perform repeated inspections of the vertical-fin forward attachment bulkhead per Cessna Service Letter SE73-40. The first check is due within 100 flight hours after Feb 28, 1974, and must be repeated every 100 flight hours until the bulkhead is replaced with the redesigned part. The measure prevents possible tail‑fuselage structural failure and loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead","history":"/api/acts/ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead/history","analysis":"/api/acts/ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead/analysis","conflicts":"/api/acts/ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead/conflicts","importantCases":"/api/acts/ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead/important-cases","documents":"/api/acts/ad-cessna-177-15-vertical-fin-forward-attachment-bulkhead/documents"}}