{"id":"F2006B09358","name":"AD/ECUREUIL/52 Amdt 1 - In Door Sliding Windows","slug":"ad-ecureuil-52-amdt-1-in-door-sliding-windows","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53613,"registerId":"commonwealth-F2006B09358-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ECUREUIL/52 Amdt 1 - In Door Sliding Windows","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nEurocopter AS 350 (Ecureuil) Series Helicopters\n\nAD/ECUREUIL/52\n\nAmdt 1\n\n  \nIn Door Sliding Windows 3/94\n\nApplicability: Models B, BA, B1, B2, and D, equipped with the sliding windows listed in the requirement document.\n\nRequirement: Action in accordance with Eurocopter AS 350 SB 05.25R1.\n\nNote: DGAC AD 93-090-067(B) R1 refers.\n\nCompliance: 1. Inspect within 25 hours time in service after 3 March 1994, and thereafter at intervals not exceeding 25 hours time in service until modified.\n\n2. Modify within 100 hours time in service after 3 March 1994, and thereafter inspect at intervals not exceeding 100 hours time in service until replaced by the post mod. windows listed in paragraph 1.C.3 of the requirement document.\n\nNote: Both the requirement document and the DGAC AD call the modification of the undamaged windows a Repair.\n\nThe effective date of the initial issue of this Directive was 7 July 1993.\n\nBackground: This Directive is raised to preclude the loss of a window during flight. Amendment 1 introduces a modification to existing windows in lieu of automatic window replacement.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 alters the original compliance path by allowing a modification to existing windows in lieu of automatic replacement. It keeps inspection mandates (25‑hour intervals until modification; 100‑hour intervals thereafter) and ties ultimate replacement to the post‑mod windows listed in the service bulletin, shifting immediate scope from compulsory replacement to a modification-plus‑inspection regime."},"complexity_factors":["Relies on an external manufacturer service bulletin (Eurocopter AS350 SB 05.25R1) for technical work and parts","Cross-reference to DGAC AD 93-090-067(B) R1 adds an international regulatory layer","Multiple time-based compliance regimes (25‑hour inspections until modification; 100‑hour inspections after modification)","Applicability limited to particular helicopter models and to sliding windows listed in the requirement document","Terminology quirk: the SB and DGAC call modification of undamaged windows a “Repair” (affects maintenance records/compliance interpretation)","Further compliance contingent on post‑mod windows described in paragraph 1.C.3 of the requirement document (external dependency)"],"plain_english_summary":"This airworthiness directive requires operators of Eurocopter AS350 models B/BA/B1/B2/D fitted with the listed sliding cabin windows to follow Eurocopter Service Bulletin AS350 SB 05.25R1: inspect within 25 hours after 3 March 1994 and every 25 hours until a modification is carried out; modify within 100 hours and then inspect every 100 hours until replaced by the post‑mod windows. The stated purpose is to prevent in‑flight window loss. Operators bear inspection and modification costs; compliance depends on the referenced service document."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (issued 7 July 1993) mandated automatic replacement of the windows. Amendment 1 expands the scope to allow a modification/repair alternative to replacement, effectively broadening compliance options while maintaining the same safety objective. This represents a scope evolution from 'replace only' to 'modify or replace'."},"complexity_factors":["Short, single-purpose directive (approximately 200 words)","Only 5 defined applicability criteria (specific helicopter models)","Two-tier compliance structure (interim inspections vs. permanent modification)","Single cross-reference to external technical document (Eurocopter Service Bulletin 05.25R1)","One regulatory cross-reference (French DGAC AD 93-090-067(B) R1)","Conditional logic limited to 'until modified' and 'until replaced' temporal triggers","No nested definitions or interpretation sections"],"plain_english_summary":"This Airworthiness Directive mandates safety measures for Eurocopter AS350 (B, BA, B1, B2, D) helicopters due to sliding door windows that can fall out in flight. Operators must perform regular inspections (initially every 25 flight hours) and, within 100 flight hours, either modify the windows or replace them with improved units; after modification inspections may extend to every 100 hours. The amended AD lets operators use a specified modification as a cost-saving alternative to full replacement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ecureuil-52-amdt-1-in-door-sliding-windows","history":"/api/acts/ad-ecureuil-52-amdt-1-in-door-sliding-windows/history","analysis":"/api/acts/ad-ecureuil-52-amdt-1-in-door-sliding-windows/analysis","conflicts":"/api/acts/ad-ecureuil-52-amdt-1-in-door-sliding-windows/conflicts","importantCases":"/api/acts/ad-ecureuil-52-amdt-1-in-door-sliding-windows/important-cases","documents":"/api/acts/ad-ecureuil-52-amdt-1-in-door-sliding-windows/documents"}}