{"id":"F2006B02140","name":"AD/AC/8 - Power Brake Valve - Modification","slug":"ad-ac-8-power-brake-valve-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41370,"registerId":"commonwealth-F2006B02140-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/8 - Power Brake Valve - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue NK,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Power Brake Valve - Modification,8\ntitle: Airworthiness Directive - AD/AC/8 - Power Brake Valve - Modification\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/8 Power Brake Valve - Modification NK\n\nApplicability: All models: /Nos. 75, 91 to 650 and all other employing nose wheel steering. Document:              Aero Commander SB No. 48.\n\nCompliance: 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1561},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical safety directive targeting a specific mechanical component on identified aircraft models. The scope is precisely limited to the power brake valve modification and has not expanded beyond this original safety purpose."},"complexity_factors":["Extremely short text (under 100 words)","Single external technical reference (Service Bulletin No. 48) containing actual implementation details","No defined terms or interpretation section","Simple applicability list using specific serial numbers","Immediate unconditional compliance requirement with no exceptions or alternative methods stated"],"plain_english_summary":"CASA has issued a mandatory Airworthiness Directive requiring owners/operators of Twin Commander 500/600/700 series aeroplanes (specified serials and any aircraft fitted with nose‑wheel steering) to modify the power brake valve system forthwith per Aero Commander Service Bulletin No. 48. \n\nThe immediate modification prevents power brake valve failures that can cause loss of braking or nose‑wheel steering control and potential runway excursions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-8-power-brake-valve-modification","history":"/api/acts/ad-ac-8-power-brake-valve-modification/history","analysis":"/api/acts/ad-ac-8-power-brake-valve-modification/analysis","conflicts":"/api/acts/ad-ac-8-power-brake-valve-modification/conflicts","importantCases":"/api/acts/ad-ac-8-power-brake-valve-modification/important-cases","documents":"/api/acts/ad-ac-8-power-brake-valve-modification/documents"}}