{"id":"F2006B07535","name":"AD/UH-1/7 - Tail Rotor Grip","slug":"ad-uh-1-7-tail-rotor-grip","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50092,"registerId":"commonwealth-F2006B07535-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \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.","sortOrder":0},{"sectionNumber":"AD/UH-1/7 Tail Rotor Grip 7/2000","sectionType":"part","heading":"AD/UH-1/7 Tail Rotor Grip 7/2000","content":"# AD/UH-1/7 Tail Rotor Grip 7/2000\n\nApplicability: Models UH1B, UH1E, UH1F, UH1L and TH1L with tail rotor grip P/N 204-011-728-1, -13, or -19 installed.\n\nRequirement: Remove from service any of the applicable tail rotor grips:\n\n    with more than 300 hours time in service, or\n\n    b. where total time in service cannot be established, and substantiated.\n\nNote: FAA AD 88-25-05 refers.\n\nCompliance: Before further flight after the effective date of this directive.\n\nThis Airworthiness Directive becomes effective on 13 July 2000.\n\nBackground: This directive is raised to prevent failure of the tail rotor grip assembly.\n\n![Signature of William Ronald Smith Delegate of the Civil Aviation Safety Authority](image.003.png)  \n\nWilliam Ronald Smith\n\nDelegate of the Civil Aviation Safety Authority 25 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.","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":2,"scope_assessment":{"changed":false,"description":"The AD's scope aligns with its stated purpose to prevent tail rotor grip failure. It targets specified models and part numbers and sets removal criteria based on hours or lack of substantiation (Applicability, Requirement, Background)."},"complexity_factors":["Narrow technical applicability: specific helicopter models and explicit part numbers (Applicability).","Simple numeric threshold for action: 300 hours time in service sets a clear trigger (Requirement).","Recordkeeping dependency: grips with unsubstantiated total time must be removed, imposing verification or disposal costs on operators (Requirement).","Immediate operational effect: compliance required 'before further flight', producing potential short‑term grounding and scheduling disruption (Compliance).","External reference: notes FAA AD 88‑25‑05, creating reliance on related foreign directive for background context but not altering the removal rule (Note).","No replacement procedure specified in the text: operators must source/fit serviceable parts under existing maintenance arrangements, adding procurement and labour burden (Requirement/Compliance)."],"plain_english_summary":"This Airworthiness Directive orders operators of specified UH‑1 and TH‑1 helicopters fitted with listed tail rotor grips to remove any grip that has more than 300 hours time‑in‑service, or any grip whose total time cannot be substantiated. Compliance is required before the helicopter's next flight. The measure mechanically forces immediate removal of at‑risk parts to prevent tail rotor grip failure, creating an immediate maintenance, parts‑replacement and recordkeeping cost for operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical defect in specific helicopter models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined part numbers in applicability","Single, clear requirement with two alternative triggers (hours threshold OR unknown history)","No cross-references to other legislation beyond a single note referencing FAA AD 88-25-05","No nested exceptions or conditional logic","Straightforward compliance deadline (before further flight after effective date)"],"plain_english_summary":"This CASA Airworthiness Directive mandates immediate removal from service of specific tail rotor grips (PN 204-011-728-1, -13, -19) installed on Bell UH-1B/E/F/L and TH-1L helicopters due to risk of tail rotor failure and loss of control.\n\nIt affects owners/operators with those part numbers; any grip with over 300 flight hours—or with unknown hours—must be removed before flight after 13 July 2000. Non‑compliance is illegal and hazardous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-uh-1-7-tail-rotor-grip","history":"/api/acts/ad-uh-1-7-tail-rotor-grip/history","analysis":"/api/acts/ad-uh-1-7-tail-rotor-grip/analysis","conflicts":"/api/acts/ad-uh-1-7-tail-rotor-grip/conflicts","importantCases":"/api/acts/ad-uh-1-7-tail-rotor-grip/important-cases","documents":"/api/acts/ad-uh-1-7-tail-rotor-grip/documents"}}