{"id":"F2006B09736","name":"AD/F27/62 Amdt 2 - Godfrey Engine Driven Cabin Supercharger Drive Quill Shaft - Modification","slug":"ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115931,"registerId":"commonwealth-F2006B09736-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/62 Amdt 2 - Godfrey Engine Driven Cabin Supercharger Drive Quill Shaft - Modification","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)  Fokker F27 Series Aeroplanes\n\n \n\nAD/F27/62\n\nAmdt 2\n\n\nGodfrey Engine Driven Cabin Supercharger Drive Quill Shaft - Modification\n\n\n1/70\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Modify the cabin supercharger drive quill shafts as follows:\n\n \n\nRework the shear neck diameter to a reduced outside diameter of 0.380+0/-0.003 inches and ensure shear neck radius is 0.375 inches and surface finish is retained at 32 micro inches RMS.\n\n \n\nNote: As an alternative to retaining a surface finish of 32 micro inches RMS, it is acceptable to evenly shot peen the reworked surface by an approved method for the purposes of improving fatigue characteristics of the quill.\n\n \n\nCompliance: Before 23 January 1970.\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":2978},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the narrow technical scope of the original directive, focusing solely on the specific quill shaft modification for Fokker F27 aircraft. As Amendment 2, it appears to update or clarify the technical requirements without expanding the scope beyond the original safety intent."},"complexity_factors":["Technical engineering specifications with tight tolerances (+0/-0.003 inches)","Specialized aviation terminology (quill shaft, shear neck, RMS surface finish, shot peening)","Reference to overarching Civil Aviation Regulations 1998 Part 39 framework","Alternative compliance method with conditional approval requirement"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Fokker F27 aircraft to modify the quill shaft that drives the cabin supercharger so its shear-neck section meets a precise diameter, corner radius and surface finish (or alternatively be shot-peened to an approved standard).  \n\nIt targets fatigue/failure risk in the drive system that could damage the engine or cause loss of cabin pressurization; compliance was required before 23 January 1970 (historical directive)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification","history":"/api/acts/ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification/history","analysis":"/api/acts/ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification/analysis","conflicts":"/api/acts/ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification/conflicts","importantCases":"/api/acts/ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification/important-cases","documents":"/api/acts/ad-f27-62-amdt-2-godfrey-engine-driven-cabin-supercharger-drive-quill-shaft-modification/documents"}}