{"id":"F2006B02284","name":"AD/AL 250/73 Amdt 2 - Bendix Power Turbine Governor","slug":"ad-al-250-73-amdt-2-bendix-power-turbine-governor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41514,"registerId":"commonwealth-F2006B02284-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/73 Amdt 2 - Bendix Power Turbine Governor","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)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAllison Turbine Engines \\- 250 Series\n\nAD/AL 250/73\n\nAmdt 2\n\n  \nBendix Power Turbine Governor 6/2002\n\nApplicability: Allison 250-C20 and C20R series equipped with Bendix fuel control systems not incorporating Allison Alert Service Bulletin CEB-A-1289 or CEB-A-73-4015.\n\nRequirement: Inspect power turbine governor Py port boss in accordance with Allison Alert Service Bulletin 250-C20 CEB-A-1281 Revision 2 or 250-C20R CEB-A-73-4012 Revision 2.\n\nNote: Incorporation of Allison Alert Service Bulletin CEB-A-1289 or CEB-A-73- 4015 will provide terminating action for this Directive.\n\nCompliance: Effective 13 June 2002 at intervals not exceeding 1000 flight hours.\n\nThis Airworthiness Directive becomes effective on 13 June 2002.\n\nBackground: The original Directive was issued to carry out the inspection as listed in the reference documents on 13 July 1989. This amendment changes the applicability to reflect a terminating action covered by Allison Alert Service Bulletin CEB-A-1289 or CEB-A- 73-4015.\n\n![](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 1 May 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 22 May 2002.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment narrows the scope slightly from the original 1989 directive by adding a terminating action, but remains tightly focused on its original purpose: ensuring the safety of the power turbine governor Py port boss on specific Allison engines. The change is administrative clarification rather than scope expansion."},"complexity_factors":["Single, specific technical requirement (one inspection procedure)","Limited applicability (two specific engine models with specific fuel control systems)","Clear terminating action specified (two alternative service bulletins)","Simple compliance structure (fixed interval of 1000 flight hours)","No nested exceptions or conditional logic","Only 4 defined technical references (the service bulletins)","Short document (approximately 250 words of substantive text)"],"plain_english_summary":"This CASA Airworthiness Directive mandates recurring inspections of the power turbine governor \"Py port boss\" on Allison 250‑C20 and C20R engines fitted with Bendix fuel controls to address an unsafe condition that could affect engine speed control. Inspections are required every 1,000 flight hours from 13 June 2002.\n\nIncorporating Allison service bulletins CEB‑A‑1289 or CEB‑A‑73‑4015 provides terminating action; Amendment 2 clarifies that those modifications end the recurring inspection requirement."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment narrows the AD's ongoing scope by recognising that incorporation of Allison Alert Service Bulletin CEB‑A‑1289 or CEB‑A‑73‑4015 provides terminating action; engines with those bulletins installed are excluded from the recurring inspection obligation. The background notes the original AD issued in 1989 and this amendment updates applicability to reflect that terminating action."},"complexity_factors":["Technical inspection requirement targeted at a specific part (power turbine governor Py‑port boss)","Cross‑reference to multiple Allison Alert Service Bulletins as the source of inspection procedures and as terminating action","Applicability depends on engine model and whether certain service bulletins have already been incorporated","Compliance measured in flight hours (recurring 1,000‑hour interval) requiring record‑keeping","Regulatory action issued by a delegated CASA official, not by primary legislation"],"plain_english_summary":"This Airworthiness Directive requires operators of Allison 250‑C20 and C20R engines fitted with Bendix fuel control (unless they've incorporated specific Allison service bulletins) to inspect the power turbine governor Py‑port boss every 1,000 flight hours, effective 13 June 2002. The Civil Aviation Safety Authority delegate issues the AD; operators pay for inspections and any repairs. Installing Allison Alert Service Bulletin CEB‑A‑1289 or CEB‑A‑73‑4015 ends the recurring inspection requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-73-amdt-2-bendix-power-turbine-governor","history":"/api/acts/ad-al-250-73-amdt-2-bendix-power-turbine-governor/history","analysis":"/api/acts/ad-al-250-73-amdt-2-bendix-power-turbine-governor/analysis","conflicts":"/api/acts/ad-al-250-73-amdt-2-bendix-power-turbine-governor/conflicts","importantCases":"/api/acts/ad-al-250-73-amdt-2-bendix-power-turbine-governor/important-cases","documents":"/api/acts/ad-al-250-73-amdt-2-bendix-power-turbine-governor/documents"}}