{"id":"F2007L02348","name":"AD/A109/59 - Overhead Panel Circuit Breakers","slug":"ad-a109-59-overhead-panel-circuit-breakers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67666,"registerId":"commonwealth-F2007L02348-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Agusta A109 Series Helicopters","sectionType":"division","heading":"Agusta A109 Series Helicopters","content":"### Agusta A109 Series Helicopters\n\n| AD/A109/59 | Overhead Panel Circuit Breakers | 9/2007 |\n| ---------- | ------------------------------- | ------ |\n\n| Applicability: | A109LUH helicopters with serial numbers 13752 through 13759 inclusive and 13761.                                                                                                                                                                                                                                                    |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Replace the ‘OVHD CSL’ and ‘EXT NORM’ circuit breakers in accordance with Agusta Alert Bollettino Tecnico 109L-005 dated 16 May 2007.                                                                                                                                                                                               |\n|                | Note: ENAC AD 2007-179 refers.                                                                                                                                                                                                                                                                                                      |\n| Compliance:    | Within 10 hours time in service after the effective date of this Directive.                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 30 August 2007.                                                                                                                                                                                                                                                                   |\n| Background:    | The Italian Ente Nazioale per L’Aviazione Civile (ENAC) has advised that a design verification conducted by Agusta revealed that the ‘OVHD CSL’ and ‘EXT NORM’ circuit breakers with incorrect ratings had been inadvertently installed. This Directive requires replacement of the circuit breakers with corrected rated breakers. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n17 July 2007","sortOrder":0},{"sectionNumber":"AD/A109/59","sectionType":"part","heading":"AD/A109/59","content":"## AD/A109/59","sortOrder":1},{"sectionNumber":"Overhead Panel Circuit Breakers","sectionType":"part","heading":"Overhead Panel Circuit Breakers","content":"## Overhead Panel Circuit Breakers","sortOrder":2},{"sectionNumber":"9/2007","sectionType":"part","heading":"9/2007","content":"## 9/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific manufacturing defect in a small fleet of helicopters. The scope remains precisely limited to the identified safety issue."},"complexity_factors":["Very short document (under 300 words)","Only 2 specific actions required (replace two named circuit breakers)","Single compliance timeframe (10 hours time in service)","Limited applicability (only 9 specific helicopter serial numbers)","No defined terms section, no cross-references to other legislation beyond a single note referencing the Italian AD","No conditional logic or exceptions"],"plain_english_summary":"This AD mandates replacement of two overhead-panel circuit breakers ('OVHD CSL' and 'EXT NORM') on specific Agusta A109LUH helicopters (S/N 13752–13759, 13761) because incorrect electrical ratings were fitted, creating risk of electrical failure or fire. Operators must comply within 10 flight hours after 30 Aug 2007 per Agusta Alert Bollettino Tecnico 109L‑005. The directive was issued by CASA’s delegate following ENAC’s action."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope aligns with the stated corrective purpose: it targets specific serial-numbered A109LUH helicopters and mandates replacement of two incorrectly rated circuit breakers identified by Agusta's design verification. The Directive does not broaden applicability or add unrelated requirements (Applicability; Requirement; Background)."},"complexity_factors":["Narrow applicability to a small set of serial-numbered aircraft reduces operational complexity but concentrates impact on a few operators (Applicability).","Very short compliance window — replacement within 10 flight hours after effective date creates scheduling and logistics pressure for operators (Compliance).","Technical instruction is delegated to an external Agusta Alert Bollettino Tecnico (109L-005); following that bulletin is required but the Directive does not reproduce procedural detail (Requirement).","Action requires sourcing correctly rated circuit breakers and qualified maintenance personnel, creating direct parts and labour costs for owners/operators (Requirement & Background).","Enforcement and effectivity are tied to the Civil Aviation Safety Authority delegate and an explicit effective date, leaving limited administrative discretion (effective date and signature)."],"plain_english_summary":"This Directive requires operators of specified Agusta A109LUH helicopters (serials 13752–13759 and 13761) to replace two overhead panel circuit breakers (‘OVHD CSL’ and ‘EXT NORM’) with correctly rated parts, following Agusta Alert Bollettino Tecnico 109L-005. The replacement must be completed within 10 flight hours of the Directive’s effective date. Owners/operators pay for parts and maintenance and must arrange qualified servicing quickly to meet the short compliance window."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-59-overhead-panel-circuit-breakers","history":"/api/acts/ad-a109-59-overhead-panel-circuit-breakers/history","analysis":"/api/acts/ad-a109-59-overhead-panel-circuit-breakers/analysis","conflicts":"/api/acts/ad-a109-59-overhead-panel-circuit-breakers/conflicts","importantCases":"/api/acts/ad-a109-59-overhead-panel-circuit-breakers/important-cases","documents":"/api/acts/ad-a109-59-overhead-panel-circuit-breakers/documents"}}