{"id":"F2006B02600","name":"AD/B-2/28 Amdt 1 - Tail Rotor Blade Spar - Inspection","slug":"ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41890,"registerId":"commonwealth-F2006B02600-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/28 Amdt 1 - Tail Rotor Blade Spar - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Brantly B-2 Series Helicopters\n\n \n\nAD/B-2/28\n\nAmdt 1\n\n\nTail Rotor Blade Spar - Inspection 2/68\n\n \n\nApplicability: All model B2, B2A and B2B. Document:  Brantly SB No. B2B-68-1.\n\nCompliance: At intervals not exceeding 100 hours time in service after 22 February 1968.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on tail rotor blade spar inspections for one helicopter series. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — relies on standard aviation terminology","Single, unambiguous compliance requirement (100-hour interval)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or alternative compliance methods","Simple applicability test (three specific model numbers)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopters.\n\n**What it does:**\n- Requires owners and operators of **Brantly B-2 series helicopters** (models B2, B2A, and B2B) to inspect the **tail rotor blade spar** (the main structural beam inside the tail rotor blade) at regular intervals.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains these specific helicopter models.\n\n**What they must do:**\n- Inspect the tail rotor blade spar **every 100 hours of flight time** (\"time in service\" means actual flying hours, not just calendar time).\n- The clock started ticking from **22 February 1968** — meaning the first inspection had to happen within 100 hours after that date, and every 100 hours thereafter.\n\n**Why it matters:**\n- Tail rotor blade spars can develop cracks or fatigue that could cause the tail rotor to fail. Since the tail rotor controls the helicopter's direction, a failure here is extremely dangerous — potentially catastrophic. This AD ensures potential problems are caught before they cause accidents.\n\n**Where the instructions come from:**\n- The actual inspection procedure is detailed in **Brantly Service Bulletin No. B2B-68-1** — the helicopter manufacturer's official technical notice."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This entry is labelled \"Amdt 1\" (Amendment 1), so it is an amended version of AD/B-2/28. The provided text does not include the original AD text or the prior scope, so the precise nature of the change from the original instrument cannot be determined from this excerpt. The amendment as presented specifies applicability (all B2/B2A/B2B), a compliance interval (every 100 hours TIS after 22 February 1968), and a referenced service bulletin (Brantly SB No. B2B-68-1). (See: title, \"Applicability\", \"Compliance\", \"Document\".)"},"complexity_factors":["Narrow technical scope: single component (tail rotor blade spar) on specific aircraft models (B2, B2A, B2B). (Applicability line)","Simple, fixed compliance interval: one recurring action at a clear 100-hour TIS interval after a specific date. (Compliance line)","Dependence on an external technical document (Brantly SB No. B2B-68-1) introduces a secondary source to locate and follow for procedural detail. (Document line)","Vintage date (22 February 1968) may complicate locating original service bulletin or historical records for implementers.","Operational implementation requires qualified maintenance personnel and record-keeping, which adds practical complexity not spelled out in the directive itself."],"plain_english_summary":"The rule mandates recurring inspections of the tail rotor blade spar on all Brantly B2, B2A and B2B helicopters, at intervals not exceeding 100 hours time-in-service measured from 22 February 1968, using the procedure in Brantly SB No. B2B-68-1.  \n\nIt therefore imposes an ongoing maintenance obligation on owners/operators/maintainers, creating recurring inspection, repair, recordkeeping and downtime costs intended to ensure spar integrity."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection","history":"/api/acts/ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection/history","analysis":"/api/acts/ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection/analysis","conflicts":"/api/acts/ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection/conflicts","importantCases":"/api/acts/ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection/important-cases","documents":"/api/acts/ad-b-2-28-amdt-1-tail-rotor-blade-spar-inspection/documents"}}