{"id":"F2006B10461","name":"AD/HS 125/21 - Control Surfaces - Trim and Geared Tab Connecting Rod Attachments - Inspection","slug":"ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116185,"registerId":"commonwealth-F2006B10461-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/21 - Control Surfaces - Trim and Geared Tab Connecting Rod Attachments - 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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/21 Control Surfaces - Trim and Geared Tab\n\nConnecting Rod Attachments - Inspection\n\n\n4/71\n\n \n\nThis AD contents has been removed from the listing because the aircraft model is not currently on the register.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The legislation has effectively been nullified — reduced from an active safety mandate with specific inspection requirements to a mere archival note. The scope has contracted to zero operational effect rather than expanded, but this represents a fundamental change from the original intent of mandating specific airworthiness actions."},"complexity_factors":["Document is essentially a placeholder/withdrawal notice — no operative provisions remain","No defined terms, cross-references, or conditional logic present","Single sentence of substantive content explaining the removal","Originally would have been more complex (inspection procedures, compliance times, etc.) but all technical content has been stripped"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it was supposed to do:**\nThe directive (numbered AD/HS 125/21) originally required inspections of **control surfaces** — specifically the **trim and geared tab connecting rod attachments** — on **British Aerospace BAe 125 series aeroplanes**. These are mechanical parts that help pilots control and stabilise the aircraft during flight.\n\n**What it actually does now:**\n**Nothing.** The document states that its contents have been **removed from the active listing** because the aircraft model (the BAe 125) is **not currently on the Australian aircraft register**. In other words, there are no BAe 125 planes flying under Australian registration right now, so the safety requirement has been withdrawn.\n\n**Who it affects:**\n- **Previously:** Owners and operators of British Aerospace BAe 125 aircraft in Australia\n- **Currently:** Nobody — the directive is inactive\n\n**Why it matters:**\nAirworthiness Directives are critical safety tools. They typically issue when a potential defect or unsafe condition is discovered in an aircraft type. This particular AD shows how aviation safety regulation adapts to the actual fleet — when aircraft types leave the register, associated maintenance requirements are cleaned up to avoid unnecessary regulatory burden."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The operative scope presented in this listing has been narrowed. Originally the AD would apply to BAe 125 series aeroplanes (requiring inspections of trim and geared tab connecting rod attachments). In this source the AD entry has been removed from the public listing because “the aircraft model is not currently on the register,” so the listing no longer sets out active, enforceable inspection requirements for any currently-registered aircraft. The underlying AD identifier remains (AD/HS 125/21), so if the model later returns to the register the original AD requirements would need to be consulted and could again apply."},"complexity_factors":["Absence of substantive inspection details in the provided listing — the entry has been removed and contains no procedural or timing provisions.","Applicability contingent on aircraft registration status — the listing states removal because the model is not on the register, which creates conditional applicability depending on register changes.","Legal embedding in Part 39 (Schedule of Airworthiness Directives) — understanding obligations requires familiarity with how ADs operate under the Civil Aviation Regulations 1998.","Need to trace the original AD document by reference (AD/HS 125/21) to get enforceable requirements — the listing alone is incomplete.","Operational implementation risk: owners/operators must monitor register and CASA sources to know when/if the AD becomes active for their fleet, increasing compliance-monitoring burden."],"plain_english_summary":"This AD (AD/HS 125/21) requires inspection of the trim and geared‑tab connecting rod attachments on British Aerospace BAe 125 series aeroplanes to address potential control‑surface safety risks. It directly affects BAe 125 owners and operators, who must perform inspections and any corrective work at their expense.\n\nThe public listing here was removed because the model isn’t on the register; consult the original AD from CASA for specific inspection methods, intervals and compliance details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection","history":"/api/acts/ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection/history","analysis":"/api/acts/ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection/analysis","conflicts":"/api/acts/ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection/conflicts","importantCases":"/api/acts/ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection/important-cases","documents":"/api/acts/ad-hs-125-21-control-surfaces-trim-and-geared-tab-connecting-rod-attachments-inspection/documents"}}