{"id":"F2006B08959","name":"AD/DH114/47 - Fuel System - Modification and Component Relocation","slug":"ad-dh114-47-fuel-system-modification-and-component-relocation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52531,"registerId":"commonwealth-F2006B08959-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/47 - Fuel System - Modification and Component Relocation","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)  DH114 (Heron) Series Aeroplanes\n\n \n\n# AD/DH114/47 Fuel System - Modification and Component Relocation\n\nApplicability: All models which have been modified to Connair Pty. Drawing 73B006 and associated engineering drawings and orders.\n\n# 7/85\n\nDM\n\n \n\nRequirement: 1. Remove low level shut-off valve from inboard fuel tanks and install in outboard fuel tanks.\n\n \n\n2.    Remove submerged boost pump from outboard tanks and install in the inboard tanks.\n\n \n\nNote: To accomplish items 1 and 2 above, it would be preferable to install the pre mod 73B006 outboard tank base plates and associated gaskets. However, should these not be available, existing base plates may be modified to suit, or new base plates manufactured from 2024-T3 0.125 inch aluminium alloy.\n\n \n\nThe inboard tank base plate low level cut-off valve aperture will require a blanking plate to be fitted using 2024-T3 0.125 inch aluminium alloy.\n\n \n\n3.    Modify the electrical system as required to accomplish component re-location.\n\n \n\n4.    Placard fuel boost pump selector switches as required.\n\n \n\n5.    Incorporate a flight manual amendment to include variation in fuel management procedures.\n\n \n\n6.    Amend maintenance manuals and maintenance schedules in a manner approved by the Secretary.\n\n \n\nCompliance: Before further flight after 30 September 1985.\n\n \n\nBackground: A review of the modified fuel system has revealed shortcomings which necessitate remedial action.\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":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific safety deficiency in a specific modification to a specific aircraft type. There is no evidence of scope creep; it remains tightly focused on the fuel system modification identified in the background."},"complexity_factors":["Single, specific aircraft type and modification scope (DH114 Heron with Connair Drawing 73B006)","Six discrete, numbered requirements with clear mechanical actions","One conditional provision (alternative methods if original parts unavailable)","No defined terms section or extensive cross-referencing","Straightforward compliance deadline (date-certain)","Minimal legal drafting — primarily technical/mechanical instructions"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators/maintainers of de Havilland DH114 Heron aeroplanes modified per Connair Drawing 73B006 to revert a fuel-system alteration: swap the low‑level shut‑off valve and submerged boost pump back to their intended tank locations. It requires physical and electrical modifications, documentation and placard updates, and authorization for part fabrication or sealing, due for compliance before flying after 30 September 1985."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive applies only to DH114/Heron aircraft already modified to Connair Drawing 73B006 and mandates remedial relocations and documentation amendments. It clarifies and requires corrective work for that modified fleet rather than expanding applicability to other aircraft or systems."},"complexity_factors":["Mechanical relocation of fuel system components across tanks (requires access, disassembly and reassembly of tanks).","Potential fabrication or modification of tank base plates from specified 2024‑T3 0.125 inch aluminium alloy if original plates are unavailable.","Requirement to blank existing apertures (material/specification specified) and ensure fuel‑tight integrity.","Electrical system modifications to suit relocated components and mandatory placarding of pump selector switches.","Documentation work: flight manual amendment and maintenance manual/schedule changes that must be approved by the Secretary.","Compliance deadline tied to 'before further flight after 30 September 1985' implying immediate grounding until work is done.","Direct costs and downtime borne by aircraft owners/operators and maintenance organisations; parts availability may affect scheduling and cost."],"plain_english_summary":"Requires specific fuel‑system hardware to be moved: the low‑level shut‑off valve is to be relocated from inboard to outboard tanks and the submerged boost pump moved from outboard to inboard tanks, with associated base‑plate work (modify or manufacture) and electrical changes. It applies to DH114 (Heron) aeroplanes modified to Connair Drawing 73B006; operators/owners must carry out the work, placard controls, and update flight and maintenance manuals (maintenance changes require Secretary approval). The action responds to a safety review identifying shortcomings."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-47-fuel-system-modification-and-component-relocation","history":"/api/acts/ad-dh114-47-fuel-system-modification-and-component-relocation/history","analysis":"/api/acts/ad-dh114-47-fuel-system-modification-and-component-relocation/analysis","conflicts":"/api/acts/ad-dh114-47-fuel-system-modification-and-component-relocation/conflicts","importantCases":"/api/acts/ad-dh114-47-fuel-system-modification-and-component-relocation/important-cases","documents":"/api/acts/ad-dh114-47-fuel-system-modification-and-component-relocation/documents"}}