{"id":"F2007L02188","name":"AD/ATR 42/12 - Main Landing Gear Wheels","slug":"ad-atr-42-12-main-landing-gear-wheels","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67424,"registerId":"commonwealth-F2007L02188-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Avions de Transport Regional ATR 42 Seri","sectionType":"division","heading":"Avions de Transport Regional ATR 42 Series Aeroplanes","content":"### Avions de Transport Regional ATR 42 Series Aeroplanes\n\n| AD/ATR 42/12 | Main Landing Gear Wheels | 8/2007 |\n| ------------ | ------------------------ | ------ |\n\n| Applicability: | Model ATR 42-300 and -320 aircraft, all serial numbers, without ATR Service Bulletin ATR42-32-0017 incorporated (Modification 1536 that introduces reinforced wheels ref. 500 6856-3).                                 |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of DGAC AD 87-091-006(B) R1.                                                                                                                                                |\n| Compliance:    | As specified in the Requirement document.                                                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 2 August 2007.                                                                                                                                                       |\n| Background:    | A report was received of the failure of the internal half rim radii of a main landing gear wheel during the acceleration stage of take-off. This Directive requires visual and NDT inspections of the affected wheels. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n22 June 2007","sortOrder":0},{"sectionNumber":"AD/ATR 42/12","sectionType":"part","heading":"AD/ATR 42/12","content":"## AD/ATR 42/12","sortOrder":1},{"sectionNumber":"Main Landing Gear Wheels","sectionType":"part","heading":"Main Landing Gear Wheels","content":"## Main Landing Gear Wheels","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","sortOrder":3}],"analysis":{"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":2,"scope_assessment":{"changed":false,"description":"This is a discrete safety directive addressing a specific mechanical failure mode in specific aircraft. It has not expanded beyond its original purpose of mandating wheel inspections following a reported failure."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (specific aircraft models and serial numbers)","Single cross-reference to external technical document (DGAC AD 87-091-006(B) R1) — the actual detailed requirements are contained there, not in this instrument","No nested exceptions or conditional logic within the instrument itself","Straightforward compliance structure: inspect by method X, deadline in referenced document"],"plain_english_summary":"This CASA Airworthiness Directive mandates visual and non‑destructive inspections of main landing gear wheels on ATR 42‑300 and ATR 42‑320 aircraft that have not received Modification 1536, following an in‑flight wheel rim failure during take‑off. It requires operators to follow the inspection procedures and compliance times in the referenced DGAC safety document to prevent catastrophic wheel failure and loss of control. Effective 2 August 2007."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive retains a narrow remedial scope: inspect main landing‑gear wheels on ATR 42‑300/‑320 airframes that lack Modification 1536. It does not expand affected models or introduce additional regulatory powers beyond requiring inspections per the referenced DGAC AD (Applicability; Requirement)."},"complexity_factors":["Reference to external instrument: Requirement directs action 'in accordance with DGAC AD 87‑091‑006(B) R1' creating dependency on that foreign AD for procedural and timing details (Requirement).","Technical scope: Mandates visual and non‑destructive testing (NDT) of wheel internal rim radii, which requires specialised inspection capability and trained personnel (Background / Requirement).","Applicability conditionality: Applies only to ATR 42‑300/‑320 aircraft without Modification 1536 (ATR Service Bulletin ATR42‑32‑0017), so operators must verify maintenance/ modification records to determine applicability (Applicability).","Missing detailed tasks/timings: Compliance is stated as 'As specified in the Requirement document', so this instrument does not itself set exact inspection intervals or corrective actions, adding administrative overhead to obtain and follow the referenced document (Compliance).","Compliance and enforcement timing: Becomes effective 2 August 2007; operators must schedule inspections around operational timetables, with potential aircraft downtime and cost implications (Compliance / header).","Concentrated operational burden: Costs and operational disruption fall on affected operators, while regulatory oversight and any follow‑up are administered by CASA (Applicability / Compliance)."],"plain_english_summary":"This airworthiness directive requires operators of ATR 42‑300 and ‑320 aeroplanes (all serial numbers) that have not had ATR Service Bulletin ATR42‑32‑0017 (Modification 1536, reinforced wheels) applied to carry out visual and non‑destructive tests of the main landing‑gear wheels. It responds to a reported internal rim failure during take‑off. Compliance must follow DGAC AD 87‑091‑006(B) R1 and becomes effective 2 August 2007. Operators pay inspection costs; CASA enforces the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-atr-42-12-main-landing-gear-wheels","history":"/api/acts/ad-atr-42-12-main-landing-gear-wheels/history","analysis":"/api/acts/ad-atr-42-12-main-landing-gear-wheels/analysis","conflicts":"/api/acts/ad-atr-42-12-main-landing-gear-wheels/conflicts","importantCases":"/api/acts/ad-atr-42-12-main-landing-gear-wheels/important-cases","documents":"/api/acts/ad-atr-42-12-main-landing-gear-wheels/documents"}}