{"id":"F2008L00603","name":"AD/AB139/1 Amdt 1 - Cockpit Door and Windows","slug":"ad-ab139-1-amdt-1-cockpit-door-and-windows","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119580,"registerId":"commonwealth-F2008L00603-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Agusta AB139 and AW139 Series Helicopter","sectionType":"division","heading":"Agusta AB139 and AW139 Series Helicopters","content":"### Agusta AB139 and AW139 Series Helicopters\n\n| AD/AB139/1 Amdt 1 | Cockpit Door and Windows | 3/2008 |\n| ----------------- | ------------------------ | ------ |\n\n| Applicability: | Requirement 1 applicable helicopters:Model AW139 helicopters, serial number 41001, and serial number 31055 through 31080, except 31068, 31073, and 31074.Model AB139 helicopters, serial numbers 31005 through 31054, except 31007.Requirement 2 applicable helicopters:Model AW139 helicopters, serial numbers 31055 through 31089, 31092, 31093, 31095, 31097 through 31101, 31103 through 31107, and 41001 through 41003.Model AB139 helicopters, serial numbers 31005 through 31054, except 31007.                                                                              |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Requirement 1.Verify the correct geometry of the door frame and windows seal installation in accordance with Part I of Agusta Technical Bulletin (BT) 139-087 Revision A, or later EASA approved revision.Note 1: Instructions for the installation of an improved seal to increase the tolerance of the current design are provided in Part I of BT 139-087 Revision A.Requirement 2.Accomplish the required actions for the installation of an additional reinforcement on sliding windows in accordance with Part II of BT 139-087, Revision A.Note 2: EASA AD 2008-0011 refers. |\n| Compliance:    | Within 150 flight hours or 6 months after 13 March 2008, whichever occurs first.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n|                | This Amendment becomes effective on 13 March 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n\n| Background: | Operators have reported a number of occurrences of in-flight loss of cockpit door windows, both left and right side. Loss of a window could result in damage to critical components. This Directive requires verification of the correct geometry of the door frame and the window seal installation, and installation of an improved seal.Amendment 1 is issued in response to a new EASA AD, which requires the additional action of reinforcement of the sliding windows in the area where cracks have developed. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n30 January 2008","sortOrder":0},{"sectionNumber":"AD/AB139/1 Amdt 1","sectionType":"part","heading":"AD/AB139/1 Amdt 1","content":"## AD/AB139/1 Amdt 1","sortOrder":1},{"sectionNumber":"Cockpit Door and Windows","sectionType":"part","heading":"Cockpit Door and Windows","content":"## Cockpit Door and Windows","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","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"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the original directive by adding Requirement 2: installation of an additional reinforcement on sliding windows per Part II of BT 139-087 (Revision A). The amendment therefore moves beyond verification and improved-seal installation to require a structural reinforcement action in response to the referenced EASA AD."},"complexity_factors":["Granular applicability by model and narrow serial-number ranges with multiple exceptions (Applicability table).","Two distinct mandatory actions (geometry/seal verification and installation of reinforcement) tied to different parts of the manufacturer Technical Bulletin (Requirement 1 and Requirement 2).","Dependence on an external technical document and its EASA-approved revisions (BT 139-087 Revision A or later/EASA AD reference).","Dual compliance metric: within 150 flight hours OR within six months of effective date (Compliance).","Amendment-driven change: additional action added in response to an EASA AD, creating a layered regulatory reference (Background).","Operational impact on operators: inspections, potential hardware replacement or modification work that must be scheduled and resourced (Requirement wording)."],"plain_english_summary":"Mechanically, this directive requires operators of specified Agusta AB139 and AW139 serial-numbered helicopters to verify cockpit door-frame geometry and window-seal installation, fit an improved seal, and (by Amendment 1) install an additional reinforcement on sliding windows per Agusta Technical Bulletin BT 139-087 (Parts I & II). It applies to the listed serial numbers, takes effect 13 March 2008, and must be done within 150 flight hours or six months. The stated aim is to prevent in‑flight loss of cockpit door windows; operators must perform the inspections and modifications and bear compliance costs."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This is Amendment 1 to an existing directive. The original directive (implied by the Background section) only required verification of door frame geometry and seal installation. Amendment 1 expanded the scope to include an additional Requirement 2 — reinforcing sliding windows where cracks had developed — in response to new information from European regulators (EASA AD 2008-0011). The scope grew from door seals to include window reinforcement."},"complexity_factors":["Multiple overlapping serial number ranges with specific exceptions (e.g., '31055 through 31080, except 31068, 31073, and 31074')","Two distinct requirements with different applicability lists (Requirement 1 vs Requirement 2 cover slightly different helicopter serial numbers)","Reference to external technical documents (Agusta Technical Bulletin BT 139-087 Revision A) and European aviation safety standards (EASA AD 2008-0011)","Conditional compliance deadline ('whichever occurs first' logic)","Cross-referencing between Australian and European regulatory systems (EASA approval required for alternative revisions)"],"plain_english_summary":"This AD mandates inspections and corrective work on specific Agusta AB139 and AW139 helicopters to address cockpit door/frame and window seal defects and to add reinforcement to sliding windows after reports of windows falling out in flight. It applies to identified serial-numbered AB139/AW139 aircraft.\n\nWork must be done within 150 flight hours or six months after 13 March 2008 to prevent window loss and potential in-flight damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ab139-1-amdt-1-cockpit-door-and-windows","history":"/api/acts/ad-ab139-1-amdt-1-cockpit-door-and-windows/history","analysis":"/api/acts/ad-ab139-1-amdt-1-cockpit-door-and-windows/analysis","conflicts":"/api/acts/ad-ab139-1-amdt-1-cockpit-door-and-windows/conflicts","importantCases":"/api/acts/ad-ab139-1-amdt-1-cockpit-door-and-windows/important-cases","documents":"/api/acts/ad-ab139-1-amdt-1-cockpit-door-and-windows/documents"}}