{"id":"F2006B02257","name":"AD/AL 250/46 Amdt 1 - Power Turbine Governor (Bendix) - Inspection of Drive Shaft","slug":"ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41487,"registerId":"commonwealth-F2006B02257-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/46 Amdt 1 - Power Turbine Governor (Bendix) - Inspection of Drive Shaft","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAllison Turbine Engines \\- 250 Series\n\nAD/AL 250/46\n\nAmdt 1\n\n  \n\nPower Turbine Governor (Bendix) \\- Inspection of Drive Shaft\n\n  \n7/83\n\nApplicability: All 250-C18, C20, C20B, C20F, C20J and C28B, C28C, C30 and C30P models fitted with Bendix power turbine governors having Part Numbers listed in reference document.\n\nDocument: Allison 250-C18\n\nAllison 250-C20, C20B, C20F, C20J Allison 250-C28B, C28C\n\nAllison 250-C30, C30P\n\n  \nCEB 212, Rev. 3 or\n\nCEB 1170, Rev. 3 or CEB 73-2018, Rev.3 or CDEB 73-3012, Rev. 3\n\nCompliance: As per requirement document.\n\nBackground: This Directive is raised in issue to ensure compliance with the requirements of the revisions made to the requirement document. Revision 2, being a complete re-issue, deletes the alert status of the original issue, adds the use of epoxy bonding to the torsional spring drive assembly, amends compliance to reflect the 3 parts into which the document has been divided and changes P/N affectivity. This Revision is the edition that is in force. Revision 3 of the document corrects several P/N only.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2437},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 significantly altered the original directive by removing the urgent 'alert' status (changing it from an emergency safety notice to a standard maintenance requirement), adding epoxy bonding repair procedures, dividing compliance requirements into three distinct parts, and substantially updating the list of affected part numbers. This transformed the instrument from a simple inspection alert into a comprehensive maintenance protocol."},"complexity_factors":["Requires cross-referencing multiple external technical documents (CEB 212, CEB 1170, CEB 73-2018, CDEB 73-3012) rather than including inspection instructions within the directive itself","Applicability determined by specific combinations of engine model variants and manufacturer part numbers","Technical aviation maintenance terminology (epoxy bonding, torsional spring drive assembly, power turbine governor)","Amendment structure requires understanding revision history (Rev 2 substantive changes vs Rev 3 part number corrections)"],"plain_english_summary":"Owners and operators of Allison 250-series turbine engines fitted with specified Bendix power turbine governors must inspect the governor drive shaft per the manufacturer’s Commercial Engine Bulletins and, if required, repair the torsional spring drive assembly using epoxy bonding. The AD prevents governor drive-shaft failures that could cause engine malfunctions. This amendment drops the emergency “alert” status, updates covered part numbers, and adds and reorganizes the repair/compliance procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft","history":"/api/acts/ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft/history","analysis":"/api/acts/ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft/analysis","conflicts":"/api/acts/ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft/conflicts","importantCases":"/api/acts/ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft/important-cases","documents":"/api/acts/ad-al-250-46-amdt-1-power-turbine-governor-bendix-inspection-of-drive-shaft/documents"}}