{"id":"F2006B07537","name":"AD/UH-1/9 - Tail Rotor Grips","slug":"ad-uh-1-9-tail-rotor-grips","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50099,"registerId":"commonwealth-F2006B07537-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-1/9 Tail Rotor Grips 8/2000","sectionType":"part","heading":"AD/UH-1/9 Tail Rotor Grips 8/2000","content":"# AD/UH-1/9 Tail Rotor Grips 8/2000\n\nApplicability: Models UH1A, UH1B, UH1E, UH1F, UH1H, UH1L, and TH1L helicopters with aluminium tail rotor grips P/N 204-011-728-19 installed.\n\nRequirement: Remove the following TR grips from service:","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive focused on a specific unsafe condition with a particular aircraft part. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly referenced (P/N = Part Number)","No cross-references to other legislation or regulations beyond a single citation of CAR 1998 subregulation 39.1(1)","Simple unconditional requirement: remove the part from service","No exceptions, exemptions, or conditional logic","Clear applicability section listing specific aircraft models and part numbers"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific action to fix a dangerous problem with an aircraft.\n\n**What it does:**\nThis directive orders the **immediate removal from service** of specific aluminium tail rotor grips (part number 204-011-728-19) installed on certain Bell UH-1 \"Huey\" helicopter models.\n\n**Who it affects:**\nOwners and operators of these specific helicopter models:\n- UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and TH-1L\n\n**Why it matters:**\nTail rotor grips are critical components that hold the tail rotor blades. If they fail, the pilot can lose control of the helicopter's yaw (directional control), which can cause a crash. This AD was issued because these particular aluminium grips were found to be unsafe — likely due to cracking, corrosion, or structural weakness — and must be removed before further flight.\n\n**What must happen:**\nThe affected tail rotor grips must be removed from service (taken off the helicopters and not used again)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text sets a narrowly defined scope: it applies to listed UH1/TH1 models with aluminium tail rotor grips P/N 204-011-728-19 and requires those grips be removed from service (Applicability; Requirement). There is no indication in the provided text that the AD's scope has been broadened or narrowed relative to an earlier intent; the AD’s effect is limited to the aircraft and part number specified and to the corrective action and timing set out by the CASA delegate."},"complexity_factors":["Narrow technical scope: applicability limited to specific helicopter models and a single part number (Applicability), reducing breadth but requiring technical part identification.","Regulatory authority and mandatory compliance: issued under subregulation 39.1(1) of CAR 1998 by a CASA delegate, creating binding obligations and regulatory discretion (For the reasons..., subregulation 39.1(1) of CAR 1998).","Operational logistical impact: removal of in-service parts can cause downtime, parts sourcing and scheduling issues (Requirement; Applicability).","Maintenance and record-keeping requirements: requires maintenance action by qualified personnel and associated documentation (Requirement).","Dependence on compliance timing: the compliance section (not reproduced in full here) determines when actions must be completed, affecting urgency and operational disruption."],"plain_english_summary":"This airworthiness directive requires removal from service of aluminium tail rotor grips P/N 204-011-728-19 from specified UH‑1 and TH‑1 helicopters, issued by a CASA delegate under subregulation 39.1(1) of CAR 1998.\n\nIt affects owners/operators and maintenance organisations, who must carry out removals, replacements and record‑keeping; owners/operators bear the direct costs and may face grounding, downtime and parts‑sourcing while compliance timing is as set in the AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-uh-1-9-tail-rotor-grips","history":"/api/acts/ad-uh-1-9-tail-rotor-grips/history","analysis":"/api/acts/ad-uh-1-9-tail-rotor-grips/analysis","conflicts":"/api/acts/ad-uh-1-9-tail-rotor-grips/conflicts","importantCases":"/api/acts/ad-uh-1-9-tail-rotor-grips/important-cases","documents":"/api/acts/ad-uh-1-9-tail-rotor-grips/documents"}}