{"id":"F2006B09063","name":"AD/DHC-3/15 - Engine Driven Fuel Pump","slug":"ad-dhc-3-15-engine-driven-fuel-pump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52817,"registerId":"commonwealth-F2006B09063-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/15 - Engine Driven Fuel Pump","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)  DHC-3 (Otter) Series Aeroplanes\n\n \n\nAD/DHC-3/15 Engine Driven Fuel Pump NK\n\nApplicability: All models fitted with Thompson TFD-900-3 or TFD900-1 fuel pumps. Requirement:               Action in accordance with De H Canada EB “O” No 52.\n\nNote: Canadian AD 58-11 refers.\n\n \n\nCompliance: Forthwith.\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 targeting a specific mechanical defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 150 words)","Only 2 defined applicability criteria (aircraft model and pump model)","Single compliance requirement referencing an external technical document","No nested conditions, exceptions, or cross-references to other legislation","Minimal regulatory language — essentially a pointer to a manufacturer's service bulletin"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **DHC-3 Otter aircraft** (a type of Canadian-built bush plane) that use specific Thompson fuel pump models.\n\n**What it requires:**\n- Aircraft owners/operators must immediately follow the instructions in **De Havilland Canada Service Bulletin \"O\" No. 52** (a manufacturer's technical notice about fixing or inspecting a problem).\n- The directive references a Canadian equivalent (AD 58-11), meaning this aligns with international safety standards.\n\n**Why it matters:**\nFuel pump failures can cause engine stoppage — catastrophic in flight. This AD forces immediate action to prevent accidents.\n\n**Who must comply:**\nAnyone operating a DHC-3 Otter with the specified Thompson fuel pumps. \"Forthwith\" means **do it now** — no grace period."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive, as presented, sets out a targeted applicability (specific aircraft with named pumps) and mandates following De H Canada EB “O” No 52 with immediate effect. The text contains no statement or indication that the scope has been altered from some earlier instrument; it functions as a narrowly scoped AD requiring immediate compliance and cross‑references a Canadian AD for related material (Applicability; Requirement; Note; Compliance)."},"complexity_factors":["Narrow applicability: applies only to DHC-3 (Otter) series aeroplanes fitted with Thompson TFD-900-3 or TFD900-1 fuel pumps (Applicability).","Delegated technical detail: the AD does not include technical steps and instead requires following De H Canada EB \"O\" No 52, so users must obtain and interpret a separate document (Requirement).","Immediate timing: compliance is required \"Forthwith\", creating scheduling and operational pressure for affected operators (Compliance).","Cross-reference to foreign material: note refers to Canadian AD 58-11, requiring cross-jurisdictional document checking (Note).","Regulatory framework: enforced under the Civil Aviation Regulations, Part 39 Schedule of Airworthiness Directives; legal enforcement context exists but is not detailed in the AD text (header)."],"plain_english_summary":"This Airworthiness Directive requires operators of DHC‑3 (Otter) aeroplanes fitted with Thompson TFD‑900‑3 or TFD900‑1 engine‑driven fuel pumps to comply forthwith with De Havilland Canada Engineering Bulletin “O” No 52. It affects aircraft owners, operators and maintenance organisations, who must bear the labour, parts and downtime costs; CASA enforces the AD. The directive delegates the technical measures to the referenced bulletin and links to a related Canadian AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-15-engine-driven-fuel-pump","history":"/api/acts/ad-dhc-3-15-engine-driven-fuel-pump/history","analysis":"/api/acts/ad-dhc-3-15-engine-driven-fuel-pump/analysis","conflicts":"/api/acts/ad-dhc-3-15-engine-driven-fuel-pump/conflicts","importantCases":"/api/acts/ad-dhc-3-15-engine-driven-fuel-pump/important-cases","documents":"/api/acts/ad-dhc-3-15-engine-driven-fuel-pump/documents"}}