{"id":"F2006B09166","name":"AD/DHC-8/11 Amdt 1 - Engine Cowl Door Retention and Pressure Relief","slug":"ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52902,"registerId":"commonwealth-F2006B09166-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/11 Amdt 1 - Engine Cowl Door Retention and Pressure Relief","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 4/1990,Aircraft above 5700 kg,Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes,Engine Cowl Door Retention and Pressure Relief,11 Amdt 1\ntitle: Airworthiness Directive - AD/DHC-8/11 Amdt 1 - Engine Cowl Door Retention and Pressure Relief\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-8/11\n\nAmdt 1\n\n\nEngine Cowl Door Retention and Pressure Relief 4/90\n\n \n\nApplicability: Model 100 series S/No. 1 to 156 and 158 to 199. Model 300 series S/No. 124.\n\n \n\nRequirement: Modify both engine, engine cowlings in accordance with DHC S.B. No. 8-71-13 Rev C.\n\n \n\nNote: Canadian AD CF-89-15 refers.\n\n \n\nCompliance: Prior to 30 November 1990.\n\n \n\nBackground: There have been instances of loss of engine cowl doors during engine fires. That door loss has rendered the fire extinguishing system ineffective.\n\n \n\nAmendment 1 reflects Rev C of the Requirement Document.\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":1035},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor technical amendment updating the referenced service bulletin to Revision C. The core safety scope—requiring engine cowl modifications to prevent door loss during fires—remains identical to the original directive."},"complexity_factors":["Single, specific technical requirement referencing an external service bulletin","Limited applicability to specific aircraft serial numbers only","No conditional exceptions or nested definitions","Clear, absolute compliance deadline","Background explains the safety rationale in plain terms"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Bombardier Dash 8 Model 100 (s/n 1–156, 158–199) and Model 300 (s/n 124) to modify both engine cowlings per De Havilland Canada Service Bulletin No. 8-71-13, Revision C. The change prevents cowl doors from blowing off during engine fires—ensuring fire extinguishing systems work—and had to be completed by 30 Nov 1990. Amendment 1 updates the service-bulletin reference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief","history":"/api/acts/ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief/history","analysis":"/api/acts/ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief/analysis","conflicts":"/api/acts/ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief/conflicts","importantCases":"/api/acts/ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief/important-cases","documents":"/api/acts/ad-dhc-8-11-amdt-1-engine-cowl-door-retention-and-pressure-relief/documents"}}