{"id":"F2008L02970","name":"AD/OH-58/6 - Tail Rotor Tip Block","slug":"ad-oh-58-6-tail-rotor-tip-block","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74942,"registerId":"commonwealth-F2008L02970-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell OH-58A (206A-1) Series Helicopters","sectionType":"division","heading":"Bell OH-58A (206A-1) Series Helicopters","content":"### Bell OH-58A (206A-1) Series Helicopters\n\n| AD/OH-58/6 | Tail Rotor Tip Block | 9/2008 |\n| ---------- | -------------------- | ------ |\n\n| Applicability: | Model OH-58A (Bell 206A-1) series helicopters, including all certificated versions; with tail rotor blade part numbers 206-016-201-001, -103, or -107, installed.                                                                                                                |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with paragraphs (a) through (f) of FAA AD 85-26-06 Amdt39-5193.Note: Bell Helicopter Alert Service Bulletins 206-85-28 Rev. A and 206-85-28Rev. B, or later FAA approved revisions, refer.                                                                  |\n| Compliance:    | As specified in the Requirement document; with the 7-day interval check to apply unless Part II of the service bulletin(s) listed in the Requirement note has been accomplished.                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 28 August 2008.                                                                                                                                                                                                                |\n| Background:    | The FAA requires the actions specified in this Directive to prevent possible loss of the tail rotor tip block and resulting tail rotor imbalance, which could lead to tail rotor gearbox and stud failure and subsequent separation of the gearbox from the helicopter tailboom. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n14 July 2008","sortOrder":0},{"sectionNumber":"AD/OH-58/6","sectionType":"part","heading":"AD/OH-58/6","content":"## AD/OH-58/6","sortOrder":1},{"sectionNumber":"Tail Rotor Tip Block","sectionType":"part","heading":"Tail Rotor Tip Block","content":"## Tail Rotor Tip Block","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"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"},"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 requirement referencing external FAA document","Simple conditional: 7-day check applies unless Part II of service bulletin completed","No nested definitions or cross-references to other Australian legislation","Clear effective date and compliance timeline"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires operators of Bell OH-58A (Bell 206A-1) helicopters with specified tail rotor blade part numbers to inspect and, if needed, replace tail rotor blade tip blocks to prevent tip-block loss and catastrophic tail-rotor/gearbox failure. It enforces the inspection/replacement procedures and 7‑day check interval from the equivalent FAA AD (85‑26‑06), adopting the U.S. safety standard rather than creating a new Australian rule."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This Directive implements the FAA AD requirements for the same helicopter models and specified tail rotor blade part numbers (see 'Applicability' and 'Requirement') without expanding the covered fleet or adding new types of measures. The only procedural distinction is the local compliance instruction that a 7‑day interval check applies unless Part II of the referenced service bulletin has been accomplished ('Compliance')."},"complexity_factors":["Cross-reference to external instrument: mandates compliance with FAA AD 85-26-06 (paragraphs (a)–(f)) rather than restating actions, requiring users to consult another legal/technical document ('Requirement').","Dependence on manufacturer service bulletins: notes Bell Helicopter Alert Service Bulletins 206-85-28 Rev. A and Rev. B or later FAA-approved revisions ('Requirement note').","Conditional compliance rule: a 7-day interval check applies unless Part II of the service bulletin(s) has been accomplished, creating a bifurcated compliance path ('Compliance').","Narrow technical applicability: applies only to Model OH-58A (206A-1) series helicopters with specified tail rotor blade P/Ns 206-016-201-001, -103, -107, which concentrates regulatory burden on a defined operator subset ('Applicability').","Safety-critical consequences: non-compliance risks tail rotor imbalance and gearbox separation, which may force prioritized, time-sensitive action by operators ('Background').","Effective date and enforceability: a specified commencement date (28 August 2008) creates immediate compliance timing obligations ('This Airworthiness Directive becomes effective on 28 August 2008')."],"plain_english_summary":"Requires operators of Bell OH‑58A (206A‑1) helicopters fitted with tail rotor blades P/N 206‑016‑201‑001, -103 or -107 to carry out the inspections and corrective actions set out in FAA AD 85‑26‑06 (paragraphs (a)–(f)) and related Bell service bulletins. Unless Part II of the service bulletin is completed, a 7‑day interval check applies. CASA made it effective 28 August 2008 to prevent loss of a tail rotor tip block that could cause rotor imbalance and separation of the tail rotor gearbox. Operators pay for and must schedule the inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-oh-58-6-tail-rotor-tip-block","history":"/api/acts/ad-oh-58-6-tail-rotor-tip-block/history","analysis":"/api/acts/ad-oh-58-6-tail-rotor-tip-block/analysis","conflicts":"/api/acts/ad-oh-58-6-tail-rotor-tip-block/conflicts","importantCases":"/api/acts/ad-oh-58-6-tail-rotor-tip-block/important-cases","documents":"/api/acts/ad-oh-58-6-tail-rotor-tip-block/documents"}}