{"id":"F2006B10000","name":"AD/FU24/52 - Fuel Line - Modification","slug":"ad-fu24-52-fuel-line-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55354,"registerId":"commonwealth-F2006B10000-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/FU24/52 - Fuel Line - Modification","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)  Airparts (NZ) Ltd. FU 24 Series Aeroplanes\n\n \n\nAD/FU24/52 Fuel Line - Modification 6/77\n\nApplicability: All model FU24 with S/Nos. 191 and below excluding turbo- prop models. Document:               Aerospace SB No. ASB/FU/003, Issue 2.\n\nCompliance: Before 1 January 1978.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1977. It has not grown beyond its original scope — it addresses one specific technical issue (fuel line modification) for one specific aircraft type and production batch. The document represents the complete regulatory instrument as issued."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — all terms are either common aviation terminology or explicitly stated (model numbers, serial numbers)","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: applicability is determined by two straightforward criteria (serial number ≤191, non-turbo-prop)","Single compliance action with fixed deadline","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Airparts (NZ) Ltd. FU24 series aeroplanes to modify their fuel lines. The modification must be done according to Aerospace Service Bulletin No. ASB/FU/003, Issue 2.\n\n**Who it affects:** Anyone who owns or operates:\n- **All FU24 model aircraft** with **serial numbers 191 and below**\n- **Excluding** turbo-prop models\n\n**When it had to be done:** Before **1 January 1978** (this is a historical directive from 1977).\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. They are issued when a design flaw, maintenance issue, or operational problem is discovered that could affect flight safety. Failing to comply with an AD means an aircraft is not legally airworthy and cannot fly. This particular AD addressed a fuel line issue that presumably posed a safety risk (such as fuel leaks or fire hazards) in early-production FU24 aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD applies to a specific subset of FU24 aircraft (serial numbers 191 and below, excluding turbo‑prop models) and mandates a fuel‑line modification per a named service bulletin to be completed by a stated date. The text provides no indication that the applicability or required action differs from that stated; therefore the instrument's scope has not been altered from what is expressed in the document (Applicability; Document; Compliance)."},"complexity_factors":["Narrow and explicit applicability (FU24, S/N 191 and below, excluding turbo‑prop models) (Applicability).","Single, well‑defined required action — a fuel‑line modification — rather than multiple conditional measures (title/Document).","Technical details are outsourced to one referenced service bulletin, which concentrates complexity into that external document (Document).","A single fixed compliance deadline with no phased or conditional compliance options (Compliance).","Mandatory nature under airworthiness regulations creates binary compliance obligations but little procedural complexity in the AD text itself (COMMONWEALTH OF AUSTRALIA … PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY)."],"plain_english_summary":"This AD mandates a fuel‑line modification for Airparts (NZ) Ltd. FU24 aeroplanes (serial numbers ≤191, excluding turbo‑prop models), to be carried out per Aerospace SB No. ASB/FU/003 Issue 2 and completed by 1 January 1978.  \n\nIt’s compulsory under the Commonwealth Civil Aviation framework, obliges owners/operators to fund and schedule the work, and non‑compliance would render affected aircraft non‑conforming."}},"importantCases":[],"_links":{"self":"/api/acts/ad-fu24-52-fuel-line-modification","history":"/api/acts/ad-fu24-52-fuel-line-modification/history","analysis":"/api/acts/ad-fu24-52-fuel-line-modification/analysis","conflicts":"/api/acts/ad-fu24-52-fuel-line-modification/conflicts","importantCases":"/api/acts/ad-fu24-52-fuel-line-modification/important-cases","documents":"/api/acts/ad-fu24-52-fuel-line-modification/documents"}}