{"id":"F2006B09174","name":"AD/DHC-8/19 - Brake Pressure Line","slug":"ad-dhc-8-19-brake-pressure-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52927,"registerId":"commonwealth-F2006B09174-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/19 - Brake Pressure Line","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)  Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n \n\nAD/DHC-8/19 Brake Pressure Line 7/92\n\nApplicability: Model DHC-8 series 100 and 300 aircraft with S/No 3 through 321. Requirement:  Action in accordance with the technical requirements of Transport Canada\n\nAirworthiness Directive CF-92-09.\n\n \n\nNote: de Havilland SB No 8-29-21 refers.\n\n \n\nCompliance: As specified in the requirement document with revised effective date 30 June 1992.\n\n \n\nBackground: Loss of hydraulic fluid from a failed brake pressure line located downstream of the quantity limiting valve resulted in total loss of the No 1 system. Attempts to use the parking brake started depletion of the No 2 hydraulic system fluid which prevented use of any hydraulic system component.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability criterion (aircraft model and serial number range)","Single cross-reference to external document (Transport Canada AD CF-92-09)","No nested conditions or exceptions","No interpretation section or defined terms","Straightforward compliance requirement: follow the Canadian directive"],"plain_english_summary":"Australia's Civil Aviation Safety Authority has issued a mandatory Airworthiness Directive for specific Bombardier DHC‑8 Series 100 and 300 aircraft (serial numbers 3–321) requiring the corrective action mandated by Transport Canada CF‑92‑09. The fix prevents a known brake pressure line failure that can leak hydraulic fluid and, via parking‑brake use, lead to complete loss of both main hydraulic systems. It affects owners, operators and maintenance engineers and is intended to avert catastrophic loss of brakes, flaps or landing gear. Compliance date: 30 June 1992."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive does not expand the set of affected aircraft or the nature of the required remedial actions; it mandates compliance with Transport Canada AD CF-92-09 for the specified DHC-8 serial numbers and records a revised compliance effective date (30 June 1992)."},"complexity_factors":["References an external technical document (Transport Canada AD CF-92-09) as the required action, creating dependency on another regulator's material","Applicability limited to specific models and serial number range (DHC-8 series 100 and 300, S/No 3–321)","Safety-critical technical subject matter (brake pressure line and hydraulic system) requiring specialised maintenance actions","Compliance deadline revised (effective date 30 June 1992), adding a time-bound enforcement element","Cross-reference to de Havilland Service Bulletin No 8-29-21 noted, increasing the number of source documents operators must consult"],"plain_english_summary":"This airworthiness directive requires operators of Bombardier (de Havilland) DHC‑8 Series 100 and 300 aircraft (serial numbers 3–321) to carry out the inspections and corrective actions specified in Transport Canada Airworthiness Directive CF‑92‑09, with compliance by the revised effective date 30 June 1992. It responds to incidents where a failed brake pressure line caused total loss of hydraulic systems; aircraft owners/operators bear the cost of inspections and repairs, and the Civil Aviation Safety Authority enforces the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-19-brake-pressure-line","history":"/api/acts/ad-dhc-8-19-brake-pressure-line/history","analysis":"/api/acts/ad-dhc-8-19-brake-pressure-line/analysis","conflicts":"/api/acts/ad-dhc-8-19-brake-pressure-line/conflicts","importantCases":"/api/acts/ad-dhc-8-19-brake-pressure-line/important-cases","documents":"/api/acts/ad-dhc-8-19-brake-pressure-line/documents"}}