{"id":"F2006B10315","name":"AD/GOV/9 - Governor Control Arm Attachment Cap Screw A-1635-105 - Replacement","slug":"ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56058,"registerId":"commonwealth-F2006B10315-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GOV/9 - Governor Control Arm Attachment Cap Screw A-1635-105 - Replacement","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propeller Governors\n\n \n\nAD/GOV/9 Governor Control Arm Attachment Cap\n\nScrew A-1635-105 - Replacement\n\n\n2/85\n\n \n\nApplicability: All McCauley Governors incorporating Part No. A-1635-105 Socket Head Cap Screws.\n\n \n\nRequirement: McCauley Service Bulletin 156.\n\n \n\nCompliance: Prior to issue of the next maintenance release after 31 May 1985.\n\n \n\nBackground:  The Manufacturer has called for a one time inspection and replacement of this subject screw to prevent the possibility of control arm separation and loss of Governor control.\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":1561},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains a narrow, technical scope focused solely on the specific mechanical defect in the identified governor component. There is no evidence of scope expansion beyond the original safety imperative to prevent control arm separation."},"complexity_factors":["Single, unambiguous applicability criterion (one specific part number)","One-time compliance action with a clear, absolute deadline","No defined terms, interpretation sections, or legislative cross-references","No conditional exemptions, exceptions, or nested logical structures"],"plain_english_summary":"**What this is:** A mandatory safety order (called an *Airworthiness Directive*) issued by the Civil Aviation Safety Authority (CASA). These directives are legally binding instructions to aircraft owners and operators.\n\n**What it requires:** Anyone operating an aircraft with a McCauley propeller governor that uses a specific screw (Part No. A-1635-105) must replace that screw. The work must follow the manufacturer's instructions in *McCauley Service Bulletin 156*.\n\n**Why it matters:** The screw holds the governor's control arm in place. If it fails, the control arm can separate from the governor, causing the pilot to lose control of the propeller — a serious flight safety risk.\n\n**Who must comply:** Aircraft owners, operators, and maintenance organisations responsible for McCauley governors containing the affected screw.\n\n**Deadline:** The replacement must be completed before the aircraft's next scheduled maintenance check (maintenance release) issued after 31 May 1985."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement","history":"/api/acts/ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement/history","analysis":"/api/acts/ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement/analysis","conflicts":"/api/acts/ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement/conflicts","importantCases":"/api/acts/ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement/important-cases","documents":"/api/acts/ad-gov-9-governor-control-arm-attachment-cap-screw-a-1635-105-replacement/documents"}}