{"id":"F2006B06745","name":"AD/S-76/69 - Main Rotor Blade Lightning Strike Damage","slug":"ad-s-76-69-main-rotor-blade-lightning-strike-damage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114572,"registerId":"commonwealth-F2006B06745-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nSikorsky S-76 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/S-76/69 Main Rotor Blade Lightning St","sectionType":"part","heading":"AD/S-76/69 Main Rotor Blade Lightning Strike Damage 10/2002","content":"# AD/S-76/69 Main Rotor Blade Lightning Strike Damage 10/2002\n\nTX\n\nApplicability: Model S-76A, B, and C helicopters.\n\nRequirement: 1. Review the blade service records and other records in accordance with the Accomplishment Instructions, paragraphs 3.A.(1), (2), and (3), of Sikorsky Aircraft Corporation Alert Service Bulletin No. 76-65-55A, dated 25 July 2002, for evidence of damage to a blade due to a lightning strike.\n\nBefore further flight, remove any blade identified as having been damaged by lightning.\n\n2. Remove blades, serial number A086-00167, 00429, 00798, 00999, 01165, 01168, 01291, and 02504, which are known to have lightning damage.\n\n    3. If the blade history cannot be determined, remove the blade from service.\n\n    4. Should a blade be subjected to lightning strike damage, remove the blade from service before further flight.\n\nNote: FAA Emergency AD 2002-15-51 refers.\n\nCompliance: 1. Before further flight after 30 July 2002.\n\n    2. Before further flight.\n    3. Before further flight.\n\n    4. After 30 July 2002.\n\nThis Airworthiness Directive becomes effective on 30 July 2002.","sortOrder":1}],"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":3,"scope_assessment":{"changed":false,"description":"Based solely on the text provided, the AD's scope is limited to Sikorsky S-76A, B and C models and to blades identified by damage, unknown history, or by specific serial numbers. The directive's purpose is to correct an unsafe condition from lightning strikes by mandating inspections and removals; there is no textual indication the scope departs from that stated intent."},"complexity_factors":["Technical inspection requirement: Review of blade service records and other records as specified by Sikorsky Alert Service Bulletin No. 76-65-55A, paragraphs 3.A.(1)-(3) (Requirement 1).","Mandatory removal actions: Immediate removal before further flight of blades identified as lightning-damaged, blades with unknown history, and eight specified serial numbers (Requirement 1–4).","Tight compliance timing: Multiple actions required 'before further flight' and effectivity date '30 July 2002' (Compliance section).","Legal authority and enforcement: Issued under subregulation 39.1(1) of CAR 1998 and references FAA Emergency AD 2002-15-51 (preamble and Note).","Operational impact: Removes in-service assets (blades) from service, creating direct replacement/maintenance costs and potential aircraft downtime for operators."],"plain_english_summary":"This Airworthiness Directive requires operators of Sikorsky S‑76A/B/C helicopters to check blade service records for lightning‑strike damage and to remove any blade found damaged, any blade whose history is unknown, and eight specifically listed serial‑numbered blades. It takes effect 30 July 2002 and removal is required before further flight. Operators (aircraft owners/operators) pay for inspections and removals; the CASA delegate issues and enforces the directive under CAR 1998, changing operator behaviour by mandating immediate removal of affected blades."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific unsafe condition (lightning damage) in a specific aircraft type (Sikorsky S-76 series). It has not expanded beyond this original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 4 numbered requirements with clear, sequential logic","Single defined term: 'Applicability' limited to 3 specific helicopter models","No cross-references to other legislation (only a non-binding note referencing a related FAA directive)","Simple temporal compliance structure ('before further flight', 'after 30 July 2002')","No nested conditions or exceptions"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of Sikorsky S‑76 A/B/C helicopters to identify and remove rotor blades affected by lightning strike damage — including specified serial-numbered blades — and to remove any blade with unknown history or any blade struck by lightning before further flight. \n\nIt addresses hidden lightning damage that can cause catastrophic blade failure, preventing in‑flight breakups."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-69-main-rotor-blade-lightning-strike-damage","history":"/api/acts/ad-s-76-69-main-rotor-blade-lightning-strike-damage/history","analysis":"/api/acts/ad-s-76-69-main-rotor-blade-lightning-strike-damage/analysis","conflicts":"/api/acts/ad-s-76-69-main-rotor-blade-lightning-strike-damage/conflicts","importantCases":"/api/acts/ad-s-76-69-main-rotor-blade-lightning-strike-damage/important-cases","documents":"/api/acts/ad-s-76-69-main-rotor-blade-lightning-strike-damage/documents"}}