{"id":"F2008L03064","name":"AD/AB139/6 - Wire Strike Protection System","slug":"ad-ab139-6-wire-strike-protection-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75095,"registerId":"commonwealth-F2008L03064-current","compilationNumber":null,"startDate":"2026-04-02","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/AB139/6 | Wire Strike Protection System | 10/2008 DM |\n| ---------- | ----------------------------- | ---------- |\n\n| Applicability: | Agusta S.p.A model AB139 and AW139 helicopters.                                                                                                                                                                                                                                                     |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with EASA AD 2008-0148.Note: Agusta Bollettino Tecnico (BT) 139-126 refers.                                                                                                                                                                                                    |\n| Compliance:    | Unless previously accomplished, within 200 flight hours after the effective date of this AD.                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 19 August 2008.                                                                                                                                                                                                                                   |\n| Background:    | This Airworthiness Directive mandates rework or replacement of the top cable cutter assembly due to possible contact between the cutter assembly and two main rotor blades. This condition, if not corrected, could cause damage to the rotor blades and lead to loss of control of the helicopter. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n12 August 2008","sortOrder":0},{"sectionNumber":"AD/AB139/6","sectionType":"part","heading":"AD/AB139/6","content":"## AD/AB139/6","sortOrder":1},{"sectionNumber":"Wire Strike Protection System","sectionType":"part","heading":"Wire Strike Protection System","content":"## Wire Strike Protection System","sortOrder":2},{"sectionNumber":"10/2008 DM","sectionType":"part","heading":"10/2008 DM","content":"## 10/2008 DM","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 standard single-issue Airworthiness Directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating a safety fix for the wire strike protection system."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 2 defined terms implicitly referenced (EASA AD 2008-0148 and Bollettino Tecnico 139-126 — both external documents)","Single compliance requirement with straightforward deadline (200 flight hours)","No nested exceptions or conditional logic","No internal cross-references to other sections of Australian legislation","Simple cause-and-effect safety rationale"],"plain_english_summary":"This AD requires owners/operators of Agusta AB139 and AW139 helicopters in Australia to inspect and rework or replace the top cable cutter assembly of the wire‑strike protection system because it may contact the main rotor blades, risking blade damage and loss of control. Work must follow EASA AD 2008‑0148 and Agusta BT 139‑126 and be completed within 200 flight hours from 19 August 2008."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD enforces the original, safety-focused corrective action specified by EASA (rework or replace the top cable cutter assembly) and applies only to AB139/AW139 helicopters. It does not expand the affected fleet or the remedial actions beyond those referenced in EASA AD 2008-0148 and Agusta BT 139-126."},"complexity_factors":["Limited applicability: only Agusta S.p.A. model AB139 and AW139 helicopters (Applicability).","Single mandated action: rework or replacement of the top cable cutter assembly (Requirement; Background).","Cross-reference to external technical instruction: action must follow EASA AD 2008-0148 and refers to Agusta Bollettino Tecnico (BT) 139-126 (Requirement).","Short compliance window tied to use: work required within 200 flight hours after the AD's effective date (Compliance).","Clear safety trigger: potential contact between the cutter assembly and two main rotor blades, with risk of blade damage and loss of control (Background).","Administrative enforcement: issued and signed by the Delegate of the Civil Aviation Safety Authority (effective date and signature block)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Agusta AB139 and AW139 helicopters to rework or replace the top cable cutter assembly in accordance with EASA AD 2008‑0148 (see Agusta BT 139‑126), within 200 flight hours. It took effect 19 August 2008. CASA issued the AD because the cutter assembly can contact two main rotor blades, risking blade damage and loss of control; owners/operators must pay for and schedule the work, and CASA enforces compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ab139-6-wire-strike-protection-system","history":"/api/acts/ad-ab139-6-wire-strike-protection-system/history","analysis":"/api/acts/ad-ab139-6-wire-strike-protection-system/analysis","conflicts":"/api/acts/ad-ab139-6-wire-strike-protection-system/conflicts","importantCases":"/api/acts/ad-ab139-6-wire-strike-protection-system/important-cases","documents":"/api/acts/ad-ab139-6-wire-strike-protection-system/documents"}}