{"id":"F2006B08695","name":"AD/DA40/2 - Modify Fuel Filter Assembly","slug":"ad-da40-2-modify-fuel-filter-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51866,"registerId":"commonwealth-F2006B08695-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nDiamond DA40 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/DA40/2 Modify Fuel Filter Assembly 9/","sectionType":"part","heading":"AD/DA40/2 Modify Fuel Filter Assembly 9/2003 TX","content":"# AD/DA40/2 Modify Fuel Filter Assembly 9/2003 TX\n\nApplicability: Diamond Aircraft Industries GmbH DA40D aircraft, serial numbers: 40.080, 40.084, D4.001 up to and including D4.020 and D4.037.\n\nRequirement: Modify the fuel filter assembly in accordance with Diamond Aircraft Industries GmbH DAI Mandatory Service Bulletin 40-023 dated 17 July 2003.\n\nNote: Austrian Airworthiness Directive No. 115 refers.\n\nCompliance: Before further flight.\n\nThis Airworthiness Directive becomes effective on 24 July 2003.\n\nBackground: The thermostat valve within the fuel filter assembly has malfunctioned leading to vapour lock of the fuel system causing a loss of engine power. This Directive requires a modification of the fuel filter system to prevent such a malfunction from occurring.\n\n![Signature of Jim Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 23 July 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 July 2003.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of correcting the fuel filter thermostat valve malfunction."},"complexity_factors":["Single, clearly defined applicability (specific aircraft serial numbers)","Single, unambiguous requirement (follow one specific service bulletin)","No defined terms section or interpretation provisions","No nested exceptions or conditional logic","No cross-references to other legislation beyond basic enabling regulation","Straightforward compliance deadline (immediate, no calculations)","Short document (approximately 200 words of substantive text)"],"plain_english_summary":"CASA requires owners/operators of specified Diamond DA40D aircraft (S/N 40.080, 40.084, D4.001–D4.020, D4.037) to modify the fuel filter assembly per Diamond’s 17 July 2003 service bulletin before further flight. A failing thermostat valve can cause vapour lock and sudden engine power loss; compliance is immediate (effective 24 July 2003)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No change of scope is evident in the text. The AD applies only to the listed DA40 serial numbers and mandates the single corrective modification per the manufacturer's service bulletin, effective 24 July 2003, with compliance required before further flight."},"complexity_factors":["Narrow, explicit applicability to a small set of serial numbers (Applicability).","Single, prescriptive technical action that defers to a manufacturer's Mandatory Service Bulletin for the method (Requirement).","Immediate mandatory timing — 'before further flight' creates operational downtime pressure for owners/operators (Compliance).","Safety rationale based on thermostat‑valve malfunction causing vapour lock and power loss (Background).","Regulatory issuance under CASR subregulation 39.1(1) leaves little regulator discretion once the AD is issued (preamble).","External references: notes Austrian AD No.115 and relies on the manufacturer's service instructions, so implementers must obtain and follow external documents (Note/Requirement).","Costs and resource needs (parts, labour, maintenance slots) are imposed on aircraft owners/operators but are not quantified in the AD (Requirement/Compliance)."],"plain_english_summary":"Requires modification of the DA40 fuel‑filter assembly (per Diamond DAI Mandatory Service Bulletin 40‑023) for the listed serial numbers, to be completed before further flight. The stated purpose is to prevent thermostat‑valve failures that caused vapour lock and loss of engine power. CASA mandates the change, so owners/operators pay for and arrange the work; aircraft remain grounded until compliance is achieved."}},"importantCases":[],"_links":{"self":"/api/acts/ad-da40-2-modify-fuel-filter-assembly","history":"/api/acts/ad-da40-2-modify-fuel-filter-assembly/history","analysis":"/api/acts/ad-da40-2-modify-fuel-filter-assembly/analysis","conflicts":"/api/acts/ad-da40-2-modify-fuel-filter-assembly/conflicts","importantCases":"/api/acts/ad-da40-2-modify-fuel-filter-assembly/important-cases","documents":"/api/acts/ad-da40-2-modify-fuel-filter-assembly/documents"}}