{"id":"F2006B07540","name":"AD/UNIVAIR/3 - Fuel Line Nipple","slug":"ad-univair-3-fuel-line-nipple","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50108,"registerId":"commonwealth-F2006B07540-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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\nUnivair Corporation Ercoupe, Forney, Alon, and Mooney M10 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/UNIVAIR/3 Fuel Line Nipple 7/2003","sectionType":"part","heading":"AD/UNIVAIR/3 Fuel Line Nipple 7/2003","content":"# AD/UNIVAIR/3 Fuel Line Nipple 7/2003\n\nApplicability: All ERCO Model 415-C, 415-CD, 415D, 415-E and 415-G aeroplanes and all Forney Model F-1 and F-1A aeroplanes that have a gascolator connected to the side of the carburettor.\n\nNote 1: This Directive does not affect those aeroplanes with a gascolator mounted on the firewall.\n\nRequirement: 1. Inspect the fuel line nipple and elbow located between the carburetor and gascolator for cracks or misalignment.\n\n    2. Replace any faulty components and/or fittings detected during Requirement 1 of this Directive, in accordance with Univair Service Bulletin (S/B) No. 24B.\n    3. Replace any aluminum fuel line nipple with one made of brass or steel in accordance with Univair S/B No. 24B.\n\n    4. Replace any aluminum fuel line elbow fitting with one made of brass or steel in accordance with Univair S/B No. 24B.\n\n    5. Inspect for the existence of double support tubes on the gascolator and install these tubes if they do not exist, in accordance with Univair S/B No. 24B as follows:\n\n    For all affected aeroplanes except for (Forney) F–1 and (Forney) F–1A aeroplanes, install part numbers 48076 and 48096 (or FAA-approved equivalent part numbers) double support tubes; and\n    For all affected (Forney) F–1 and (Forney) F1–A aeroplanes, install part numbers 48098 and 48099 (or FAA-approved equivalent part numbers) double support tubes.\n\n    Do not install on any affected aeroplane an aluminium fuel line nipple or aluminium elbow.\n    Do not install a gascolator on the side of the carburettor on any affected aeroplane, unless the double support tubes specified in Requirement 4a or 4b of this Directive are installed.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is confined to the listed ERCO 415 series and Forney F-1/F-1A aeroplanes that have a gascolator connected to the side of the carburettor and expressly excludes firewall-mounted gascolators (Note 1). The AD prescribes inspection, replacement with brass/steel parts and installation of specified double-support tubes (requirements 1–5); it does not expand applicability beyond those models or configurations stated in the Directive."},"complexity_factors":["Technical maintenance action limited to inspection and replacement of specific fuel fittings (low procedural complexity).","Mandates material substitution (aluminium prohibited; brass/steel required) which affects parts procurement and compatibility.","Relies on an external document (Univair Service Bulletin No. 24B) for the detailed work instructions, adding a dependency.","Different prescribed part numbers for Forney F-1/F-1A versus other affected aeroplanes increases parts-list complexity.","Applicability is model- and configuration-specific (applies only where gascolator is mounted at the carburettor side; firewall-mounted gascolators excluded), requiring checks to determine applicability.","Prohibitions on future installations (no aluminium nipple/elbow; no side-mounted gascolator unless double tubes installed) create ongoing compliance and record-keeping obligations."],"plain_english_summary":"Requires owners/operators of specified Univair (ERCO Model 415 series) and Forney (F-1/F-1A) aeroplanes that have a gascolator mounted on the side of the carburettor to inspect the fuel line nipple and elbow for cracks or misalignment, replace faulty or aluminium fittings with brass or steel, and fit specified double-support tubes before side-mounting a gascolator. CASA issues the AD; owners/operators pay for inspections, parts and installation and must follow Univair Service Bulletin No. 24B for compliance."},"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 models. The scope remains tightly focused on the fuel line nipple and gascolator mounting issue as originally intended."},"complexity_factors":["Single, clearly defined applicability section with specific aircraft models","Five numbered requirements with straightforward actions (inspect, replace, install)","Only one external reference (Univair Service Bulletin No. 24B)","Minimal conditional logic — essentially 'if aluminium, replace with brass/steel'","No nested exceptions or complex cross-referencing","Plain language throughout with technical terms explained by context"],"plain_english_summary":"This CASA safety order targets older Ercoupe, Forney, Alon and Mooney M10 aeroplanes with gascolators mounted at the carburettor side. It mandates inspection and replacement of fuel‑line parts, swaps aluminium fittings for brass/steel, adds double‑support tubes, and bans aluminium fittings and unsupported side‑mounted gascolators. The aim is to eliminate vibration‑induced fuel leaks and reduce engine fire/explosion risk for owners and operators of the affected aircraft."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-univair-3-fuel-line-nipple","history":"/api/acts/ad-univair-3-fuel-line-nipple/history","analysis":"/api/acts/ad-univair-3-fuel-line-nipple/analysis","conflicts":"/api/acts/ad-univair-3-fuel-line-nipple/conflicts","importantCases":"/api/acts/ad-univair-3-fuel-line-nipple/important-cases","documents":"/api/acts/ad-univair-3-fuel-line-nipple/documents"}}