{"id":"F2006B07539","name":"AD/UNIVAIR/2 - Wing Centre Section","slug":"ad-univair-2-wing-centre-section","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50105,"registerId":"commonwealth-F2006B07539-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 CAR 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/2 Wing Centre Section 3/2003","sectionType":"part","heading":"AD/UNIVAIR/2 Wing Centre Section 3/2003","content":"# AD/UNIVAIR/2 Wing Centre Section 3/2003\n\nApplicability: All Alon Model A-2 and A2-A aircraft.\n\nAll ERCO Model 415-C, 415-CD, 415D, 415-E, and 415-G aircraft. All Forney Model F-1 and F-1A aircraft.\n\nAll Mooney M10 aircraft.\n\nRequirement: 1. Inspect the wing centre section for corrosion or corrosion damage in accordance with the Procedures section of Univair Aircraft Corporation Service Bulletin (SB) No. 31 dated 29 January 2002, or SB No. 31 Revision 1 dated 14 June 2002, and Advisory Circular 43-4A (Corrosion Control for Aircraft); by accomplishing one of the following:\n\n    Install inspection openings to gain access to the wing walkway box structure and inspect the wing centre section structure.\n\n    b. Use a scope and light source eg. fibrescope, boroscope, or endoscope to inspect the wing centre section structure.\n\n    c. Remove the outer wing panels to gain visual access to the wing walkway box structure.\n\n    2. If corrosion or corrosion damage is found during any inspection required in Requirement 1 of this Directive, repair or replace damaged components of the wing centre section structure in accordance with SB No. 31 or SB No. 31 Revision 1, the applicable maintenance manual and Advisory Circular 43-4A.\n\n    3. If inspection openings are installed in accordance with Requirement 1.a. of this Directive, install cover plate assemblies in accordance with SB No. 31 or SB No. 31 Revision 1.\n\nNote: FAA AD 2002-26-02 Amdt 39-12987 refers.\n\nCompliance: 1. Within the next 12 months after 20 March 2003, and thereafter at intervals not to exceed 3 years.\n\n    2. Before further flight after any inspection in which corrosion or corrosion damage is found.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive's scope is consistent with its stated applicability and requirements: it mandates corrosion inspections and corrective action for the listed aircraft models using the referenced service bulletin and advisory circular. No change from the instrument's stated scope is evident within the text provided."},"complexity_factors":["Multiple affected models listed under 'Applicability' — broad operator base (Applicability).","Several alternative inspection access methods allowed (install openings; use scope; remove outer panels), creating variable labour/time costs (Requirement 1.a–c).","Repairs must follow external documents (Univair SB No.31 or Revision 1, maintenance manual, AC 43-4A), requiring access to and reliance on those sources (Requirement 2).","Recurring inspection interval and a one‑time initial due date set a schedule for ongoing compliance (Compliance 1).","Any corrosion found must be corrected before further flight, imposing immediate out-of-service and repair costs (Requirement 2; Compliance 2).","If inspection openings are fitted, cover plate reinstallation is mandated, adding material and labour steps (Requirement 3).","Cross-reference to FAA AD may affect interpretation or methods used by maintenance organisations (Note: FAA AD 2002-26-02).","Regulatory basis stated (CASA delegate under subregulation 39.1(1) of CAR 1998) establishes enforceability and administrative discretion."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Alon, ERCO, Forney and Mooney M10 aeroplanes to inspect the wing centre section for corrosion and to repair or replace any corroded parts following Univair Service Bulletin No.31 and Advisory Circular 43-4A. Initial inspection is due within 12 months after 20 March 2003 and then every three years; any corrosion found must be corrected before further flight. It affects aircraft operators, maintenance organisations and aircraft owners who pay for compliance."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a focused, single-purpose scope: addressing corrosion in wing centre sections of specific aircraft models. The scope remains tightly constrained to this safety issue without expansion into unrelated operational or maintenance matters."},"complexity_factors":["Single, clearly defined applicability section listing specific aircraft models","Three alternative inspection methods provided (flexibility reduces complexity)","Straightforward conditional logic: if corrosion found → repair/replace","Clear compliance timeline (12 months from effective date, then 3-yearly)","References to external technical documents (Service Bulletin 31, Advisory Circular 43-4A) but does not reproduce their content","No nested exceptions or complex defined terms","Short document (approximately 300 words of substantive text)"],"plain_english_summary":"This CASA Airworthiness Directive mandates periodic inspection of the wing centre section for corrosion on certain vintage light aircraft (Ercoupe/ERCO, Forney, Alon, and Mooney M10 types). Owners/operators must inspect, repair or replace any corroded structure, and seal inspection openings before further flight.\n\nIt affects small single‑engine aircraft of these models and aims to prevent structural failure from corrosion by imposing regular checks and mandatory remediation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-univair-2-wing-centre-section","history":"/api/acts/ad-univair-2-wing-centre-section/history","analysis":"/api/acts/ad-univair-2-wing-centre-section/analysis","conflicts":"/api/acts/ad-univair-2-wing-centre-section/conflicts","importantCases":"/api/acts/ad-univair-2-wing-centre-section/important-cases","documents":"/api/acts/ad-univair-2-wing-centre-section/documents"}}