{"id":"F2011L00727","name":"AD/ATR 42/28 - Barrel - Swinging Lever Hinge","slug":"ad-atr-42-28-barrel-swinging-lever-hinge","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":86428,"registerId":"commonwealth-F2011L00727-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 42/28 | Barrel - Swinging Lever Hinge | 10/2011 |\n| ------------ | ----------------------------- | ------- |\n\n| Applicability: | Model ATR 42-200, 42-300 and 42-320 aeroplanes on which Service Bulletin MESSIER-DOWTY 631-32-145 has not been incorporated.                                                                          |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Incorporate Service Bulletin MESSIER-DOWTY 631-32-145.Note: DGAC AD 1996-294(B) R4 refers.                                                                                                            |\n| Compliance:    | If a certificate of airworthiness has not been issued - prior to issue of a certificate of airworthiness.If a certificate of airworthiness has been issued - prior to first flight after20 June 2011. |\n|                | This Airworthiness Directive becomes effective on 20 May 2011.                                                                                                                                        |\n| Background:    | DGAC AD 1996-294(B) R4 specifies periodic inspections until Service Bulletin MESSIER-DOWTY 631-32-145 is incorporated.                                                                                |\n\n![](image.001.png)\n\nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n9 May 2011","sortOrder":0},{"sectionNumber":"AD/ATR 42/28","sectionType":"part","heading":"AD/ATR 42/28","content":"## AD/ATR 42/28","sortOrder":1},{"sectionNumber":"Barrel - Swinging Lever Hinge","sectionType":"part","heading":"Barrel - Swinging Lever Hinge","content":"## Barrel \\- Swinging Lever Hinge","sortOrder":2},{"sectionNumber":"10/2011","sectionType":"part","heading":"10/2011","content":"## 10/2011","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical component in a specific aircraft type. The scope remains tightly constrained to the barrel swinging lever hinge issue as originally identified."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability condition (Service Bulletin incorporation status)","Simple binary compliance structure (new aircraft vs. existing aircraft)","Single cross-reference to French authority directive (DGAC AD 1996-294(B) R4)","No nested exceptions or conditional logic beyond the two compliance pathways","Technical content limited to referencing external service bulletin rather than detailing procedures"],"plain_english_summary":"This CASA Airworthiness Directive mandates installation of Service Bulletin MESSIER‑DOWTY 631‑32‑145 to modify the barrel swinging lever hinge in ATR 42‑200/300/320 landing gear. It applies to owners/operators where the SB is not already embodied.\n\nNew aircraft must have the fix before certification; existing aircraft must comply before their first flight after 20 June 2011. The AD replaces repetitive inspections with a permanent repair to reduce landing‑gear failure risk (effective 20 May 2011)."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive formalises and mandates incorporation of Messier‑Dowty Service Bulletin 631‑32‑145 for specified ATR 42 variants and sets compliance deadlines; it does not expand the population affected beyond the stated models and continues the prior DGAC approach (periodic inspections until incorporation) rather than changing the underlying safety scope (see \"Applicability\" and \"Background\")."},"complexity_factors":["Narrow applicability to specific models (\"Model ATR 42-200, 42-300 and 42-320 aeroplanes\" — Applicability).","Single prescriptive action: incorporation of Service Bulletin MESSIER-DOWTY 631-32-145 (\"Requirement\").","Conditional compliance timing linked to certificate status (two alternative deadlines: prior to issue of a certificate of airworthiness; or prior to first flight after 20 June 2011 — \"Compliance\").","Reference to an external regulator's AD and interim inspection regime (DGAC AD 1996-294(B) R4 required periodic inspections until the SB was incorporated — \"Background\"), creating cross-jurisdictional compliance tracing.","Administrative enforcement and recordkeeping burden on operators to show compliance before certification or first post-deadline flight (implied by the conditional timing in \"Compliance\").","Limited regulatory discretion in the text: the AD prescribes a specific SB rather than optional corrective actions (\"Requirement\"), reducing interpretive complexity but increasing logistical/parts burden for operators."],"plain_english_summary":"This Airworthiness Directive requires ATR 42‑200/300/320 aeroplanes that have not incorporated Messier‑Dowty Service Bulletin 631‑32‑145 to have that modification embodied. CASA (signed by its delegate) issues the directive; owners/operators must complete the modification — before issue of a certificate of airworthiness if none exists, or before the first flight after 20 June 2011 if the aircraft is certificated. The DGAC had required periodic inspections until the bulletin was incorporated."}},"importantCases":[],"_links":{"self":"/api/acts/ad-atr-42-28-barrel-swinging-lever-hinge","history":"/api/acts/ad-atr-42-28-barrel-swinging-lever-hinge/history","analysis":"/api/acts/ad-atr-42-28-barrel-swinging-lever-hinge/analysis","conflicts":"/api/acts/ad-atr-42-28-barrel-swinging-lever-hinge/conflicts","importantCases":"/api/acts/ad-atr-42-28-barrel-swinging-lever-hinge/important-cases","documents":"/api/acts/ad-atr-42-28-barrel-swinging-lever-hinge/documents"}}