{"id":"F2006B02603","name":"AD/B-2/30 Amdt 3 - Retirement Life - Critical Components","slug":"ad-b-2-30-amdt-3-retirement-life-critical-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41893,"registerId":"commonwealth-F2006B02603-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/30 Amdt 3 - Retirement Life - Critical Components","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png) \nBrantly B-2 Series Helicopters\n\nAD/B-2/30\n\nAmdt 3\n\n \nRetirement Life \\- Critical Components 2/73\n\nApplicability: All model B-2.\n\nRequirement: The following components shall be retired from service at or before the times shown below.\n\n| Main Rotor System | Part Number | Max. Operating Hours time in service |\n| ------------------------------------------------------------------------------------------------------- | -------------- | ------------------------------------ |\n| Outboard Main Rotor Blades (except spar assy. P/N 248-45) | 248-40 | 500 |\n| Outboard Main Rotor Blades (except spar assy P/N 248-45) | 248-46 | 500 |\n| Outboard Main Rotor Blade | 248-53 | 2500 |\n| Outboard Main Rotor Blade | 248-100 | 2500 |\n| Outboard Main Rotor Blade | 248-101 | 2500 |\n| Lag Hinge Block | 4-1 | 2500 |\n| Lag Hinge Block | 4-12 | 2500 |\n| Hub and Pylon Assy (when used with outboard blades P/N 248-40) | 333 | 2500 |\n| Control Tube Assy - Main Rotor (when used with outboard blades P/N 248-40) | 305-2 | 1310 |\n| Control Tube Assy - Main Rotor (when used with outboard blades P/N 248-46, 248-53, 248-100 and 248-101) | 305-2 | 2500 |\n| Inboard Yoke | 280-4 | 2500 |\n| Hub and Inboard Blade Assy. | 305-1 | 2500 |\n| Pylon Outboard Bearing Shaft (Part of Hub and Inboard Blade Assy.) | 280-5 or 280-6 | 500 |\n| Main Rotor Hub Clevis Bearings: | Part Number | Max. Operating Hours time in service |\n| Outer Race | SJ7275SS | 600* |\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nInner Race IR7275, M1-\n\n19 or 34466\n\n \n600\\*\n\n\\* Bearings must be rotated as specified in Section III of Maintenance Manual after 300 hours time in service.\n\n```html\n

Drive System

Part Number

Max. Operating Hours time in service

Transmission Assy.

324

2500

Free Wheeling Clutch Assy.

10-11

2500

Free Wheeling Clutch Cage

10-2

300

Overrunning Clutch (Formsprag)

CL-40237

2500

Drive Shaft Extension Assy.

108-33

2500

Intermediate Gear Box Assy.

278-100

2500

Tail Rotor Gearbox Assy.

278-200

2500

Effective:

Forthwith.

\n```","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"As Amendment 3 to AD/B-2/30, the instrument updates the applicable retirement lives and maintenance instruction for Brantly B-2 components by specifying maximum operating hours for numerous parts (including conditional limits and a bearing-rotation requirement). The amendment therefore alters the existing AD’s component retirement requirements and imposes updated compliance obligations on owners/operators."},"complexity_factors":["Large number of discrete parts each with its own maximum hours-in-service","Conditional retirements: some limits apply only when parts are used with particular other part numbers (e.g. control tube assemblies tied to specific outboard blade P/Ns)","Mixed lifetimes (from 300 to 2500 hours) requiring tracking across different systems","Specific maintenance action for bearings (must be rotated after 300 hours) alters standard replacement regime","Immediate effective date (‘Forthwith’) creates near-term implementation and compliance pressure","Tabular presentation and multiple part-number formats increase risk of misinterpretation in maintenance records"],"plain_english_summary":"This Airworthiness Directive requires owners and operators of all Brantly B-2 helicopters to retire specified ‘critical’ components at or before set hours-in-service. It lists part numbers and mandatory maximum operating hours (with some conditional limits and a bearing-rotation instruction) and takes effect forthwith. Owners/operators bear the cost and maintenance burden of replacing these parts; the Civil Aviation Safety Authority enforces compliance and the rule changes operating and maintenance schedules for affected aircraft."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 3 to an existing Airworthiness Directive, but the scope remains tightly focused on retirement life limits for critical components of Brantly B-2 helicopters. The amendment appears to update specific part numbers and hour limits without expanding beyond the original safety purpose of preventing fatigue-related failures in this specific aircraft type."},"complexity_factors":["Single, clearly defined applicability (all model B-2 helicopters)","Straightforward tabular format listing 17 specific components with part numbers and hour limits","Only one conditional requirement (bearing rotation at 300 hours)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No defined terms section — uses plain technical language","Single effective date trigger (\"forthwith\") with no transitional provisions"],"plain_english_summary":"This CASA Airworthiness Directive immediately imposes mandatory, hour-based retirement limits on critical components of Brantly B‑2 helicopters (rotor blades, drive components, gearboxes, bearings, etc.). Owners, operators and maintenance engineers must remove parts once they hit their service hours and perform required interim actions (for example bearing rotation). The AD prevents fatigue-related failures and noncompliance is unlawful."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-30-amdt-3-retirement-life-critical-components","history":"/api/acts/ad-b-2-30-amdt-3-retirement-life-critical-components/history","analysis":"/api/acts/ad-b-2-30-amdt-3-retirement-life-critical-components/analysis","conflicts":"/api/acts/ad-b-2-30-amdt-3-retirement-life-critical-components/conflicts","importantCases":"/api/acts/ad-b-2-30-amdt-3-retirement-life-critical-components/important-cases","documents":"/api/acts/ad-b-2-30-amdt-3-retirement-life-critical-components/documents"}}