{"id":"F2006B11318","name":"AD/MSR/2 - Tab Control Pinion on Shaft - Modification","slug":"ad-msr-2-tab-control-pinion-on-shaft-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57172,"registerId":"commonwealth-F2006B11318-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/2 - Tab Control Pinion on 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)  Aerospatiale Rallye Series Aeroplanes\n\n \n\nAD/MSR/2 Tab Control Pinion on Shaft - Modification 8/62\n\nApplicability: All models with S/Nos. 1 to 5, 8, 9, 11, 19, 20, 26, 27, 31, 42, 43, 46, 50, 53, 54, 56,\n\n57, 59 to 62, 64 to 69, 71 to 74.\n\n \n\nDocument: 1. Rallye SB No. 4; or\n\n \n\n2. MS Mod. No. 14. Compliance: Forthwith.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied AD text sets a clear and narrow scope (specific serial numbers and a required modification) and does not indicate any amendment, expansion, or reduction of scope relative to earlier instruments. The document itself does not present information showing a change from any prior intent."},"complexity_factors":["Narrow, explicit applicability by serial number increases clarity but requires checking individual aircraft records (Applicability).","Technical procedure is not included in the AD text and requires consultation of external documents (Rallye SB No. 4 or MS Mod. No. 14), adding an extra documentary step (Document).","Immediate compliance deadline ('Forthwith') creates scheduling urgency for operators (Compliance).","The AD text is short and prescriptive, with no layered regulatory exceptions or cross-references in the supplied excerpt (low legal complexity).","Absence of stated cost, enforcement details, or certification procedures in the supplied text means implementers must seek further regulatory or maintenance guidance (missing procedural detail)."],"plain_english_summary":"This CASA airworthiness directive mandates an immediate modification (“Tab Control Pinion on Shaft”) for specific Aerospatiale Rallye airframes (listed serial numbers). Affected owners/operators must comply forthwith by following either Rallye Service Bulletin No. 4 or MS Modification No. 14. The AD sets the requirement and timeframe; the technical steps are in the referenced documents."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for a specific mechanical issue on a specific aircraft type. It has not expanded beyond its original purpose of mandating a safety modification to the tab control pinion assembly."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined technical references (Rallye SB No. 4 and MS Mod. No. 14)","Simple conditional logic: if your aircraft serial number matches the list, you must comply","No nested exceptions or cross-references to other legislation","Single compliance requirement with immediate effect ('forthwith')","Narrow, specific applicability (one aircraft type, specific serial numbers only)"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nRequires owners and operators of specific **Aerospatiale Rallye series aeroplanes** to modify the \"tab control pinion on shaft\" — a mechanical component in the aircraft's control system.\n\n**Who it affects:**\nOwners and operators of Aerospatiale Rallye aircraft with specific serial numbers listed (S/Nos. 1 to 5, 8, 9, 11, 19, 20, 26, 27, 31, 42, 43, 46, 50, 53, 54, 56, 57, 59 to 62, 64 to 69, 71 to 74).\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. If you own or operate one of these aircraft, you **must** carry out this modification immediately (\"forthwith\") to keep the aircraft airworthy and legally able to fly. The modification must follow either:\n- Rallye Service Bulletin No. 4, or  \n- MS Modification No. 14\n\nFailure to comply means the aircraft cannot legally operate in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-2-tab-control-pinion-on-shaft-modification","history":"/api/acts/ad-msr-2-tab-control-pinion-on-shaft-modification/history","analysis":"/api/acts/ad-msr-2-tab-control-pinion-on-shaft-modification/analysis","conflicts":"/api/acts/ad-msr-2-tab-control-pinion-on-shaft-modification/conflicts","importantCases":"/api/acts/ad-msr-2-tab-control-pinion-on-shaft-modification/important-cases","documents":"/api/acts/ad-msr-2-tab-control-pinion-on-shaft-modification/documents"}}