{"id":"F2006B09206","name":"AD/DHC-8/50 Amdt 1 - Ditching Dam Inflation Bottle","slug":"ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53036,"registerId":"commonwealth-F2006B09206-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/50 Amdt 1 - Ditching Dam Inflation Bottle","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAD/DHC-8/50\n\nAmdt 1\n\n  \nDitching Dam Inflation Bottle 12/98\n\nApplicability: DHC-8 aircraft, Models 311, 314, and 315 in the medium and high gross weight configuration incorporating Change Requests CR803SO00001, CR803SO00001-1, CR803SO00002, CR803SO00002-1, CR803CH00046, CR803CH00079, CR803CH00105, CR825CH00847, or CR803CH00051.\n\nRequirement: Incorporate de Havilland Modification 8/3154. This modification installs bottle assemblies with part number 410870-3 or -5. Instructions for incorporating de Havilland Modification 8/3154 are detailed in de Havilland Service Bulletin 8-25- 122, Rev A.\n\nNote: Transport Canada AD CF-97-21R1 refers.\n\nCompliance: Unless already accomplished, before 5 February 1999.\n\nThis Airworthiness Directive becomes effective on 5 November 1998.\n\nBackground: During a functional test of the ditching dams on DHC-8-300 aircraft, some dams failed to fully inflate. The cause was determined to be incorrect operation of the inflation cylinder assembly, manufactured by Adams Rite Sabre International.\n\nAmendment 1 is issued in response to a revision of the related Transport Canada AD, which adds two Change Requests to applicability and identifies the part numbers of the bottle assemblies installed by the modification.\n\nThe original issue of this Airworthiness Directive became effective on 26 February 1998.","sortOrder":0}],"analysis":{"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":"Amendment 1 broadens and clarifies the original AD by adding two Change Requests to the applicability list and by identifying the specific replacement bottle assembly part numbers (410870-3 and -5). The amendment therefore slightly expands the set of affected aircraft/configurations and specifies the approved replacement parts (text: \"Amendment 1...adds two Change Requests...and identifies the part numbers\")."},"complexity_factors":["Narrow technical scope: applies only to DHC-8 Models 311, 314, 315 in specified configurations (text: \"Applicability\").","Clear required action: incorporation of de Havilland Modification 8/3154 via Service Bulletin 8-25-122 Rev A (text: \"Requirement\").","Parts specified: identifies replacement bottle assembly part numbers 410870-3 or -5 (text: \"This modification installs bottle assemblies with part number 410870-3 or -5\").","Firm compliance deadline and effective date: effective 5 Nov 1998, compliance before 5 Feb 1999 (text: \"Compliance\" and \"effective\").","Cross-jurisdictional reference: notes Transport Canada AD CF-97-21R1 for related information (text: \"Note\").","Operational burden concentrated on aircraft operators: they must obtain parts, carry out modification per the service bulletin, and record compliance (implied by \"Requirement\" and \"Compliance\").","Logistics and supply risk: procurement/installation scheduling and availability of specified assemblies could affect compliance timing.","Traceability/recording: reliance on incorporation of a specific manufacturer modification and service bulletin creates documentary compliance requirements."],"plain_english_summary":"This Airworthiness Directive requires operators of certain DHC-8-300 series aeroplanes (Models 311, 314, 315 with listed Change Requests) to install updated ditching-dam inflation bottle assemblies (part numbers 410870-3 or -5) by 5 February 1999, following de Havilland Service Bulletin 8-25-122 Rev A. CASA states this responds to failures of some ditching dams to fully inflate caused by incorrect operation of the existing inflation cylinder assembly. Operators must schedule, fund and certify the modification for affected aircraft."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of the February 1998 directive. It simply expands applicability to cover two additional engineering change requests and specifies part numbers for the replacement bottles — technical refinements rather than scope expansion."},"complexity_factors":["Highly specific applicability criteria requiring cross-referencing of aircraft model, weight configuration, and eight different change request numbers","Mandatory compliance with external technical documents (Service Bulletin 8-25-122 Rev A) not reproduced in the directive itself","Reference to parallel Canadian regulatory action (Transport Canada AD CF-97-21R1) requiring jurisdictional awareness","Amendment structure requires understanding of what changed from original AD (February 1998) versus this version (November 1998)"],"plain_english_summary":"This Airworthiness Directive mandates that operators of certain Bombardier DHC-8-300 (Models 311/314/315 with specific engineering change requests) replace faulty inflation bottle assemblies in their ditching dams to ensure proper flotation in a water-landing. The required modified bottles and installation follow the manufacturer’s service bulletin and were to be fitted by 5 February 1999. Amendment 1 broadens the affected ECR coverage and clarifies the replacement part numbers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle","history":"/api/acts/ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle/history","analysis":"/api/acts/ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle/analysis","conflicts":"/api/acts/ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle/conflicts","importantCases":"/api/acts/ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle/important-cases","documents":"/api/acts/ad-dhc-8-50-amdt-1-ditching-dam-inflation-bottle/documents"}}