{"id":"F2006B10403","name":"AD/HS 125/124 Amdt 2 - Wing Top Skin Bolt Holes and Internal Stringers","slug":"ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116069,"registerId":"commonwealth-F2006B10403-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/124 Amdt 2 - Wing Top Skin Bolt Holes and Internal Stringers","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 5/1995,Aircraft above 5700 kg,British Aerospace BAe 125 Series Aeroplanes,Wing Top Skin Bolt Holes and Internal Stringers,124 Amdt 2\ntitle: Airworthiness Directive - AD/HS 125/124 Amdt 2 - Wing Top Skin Bolt Holes and Internal Stringers\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 125/124\n\nAmdt 2\n\n\nWing Top Skin Bolt Holes and Internal Stringers 5/95\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":false,"description":"This appears to be a standard archival action where an Airworthiness Directive was withdrawn from active status when the affected aircraft type left the Australian register. This is the intended lifecycle of such directives — they apply only while relevant aircraft are operational in Australia. No expansion of scope has occurred."},"complexity_factors":["Document is essentially a placeholder/stub with no operative provisions","No defined terms, cross-references, or conditional logic present","Consists of a title, reference number, and explanatory note about removal","Substantive technical content has been deleted/archived"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** issued by the Civil Aviation Safety Authority (CASA) under Australian aviation law. It relates to **British Aerospace BAe 125 Series aircraft** — specifically concerning inspections or repairs needed for **wing top skin bolt holes and internal stringers** (structural components of the aircraft wing).\n\n**Key points:**\n- **What it is:** A safety instruction that would have required aircraft owners/operators to check or fix specific structural issues on these planes.\n- **Current status:** The directive's contents have been **removed from the active register** because no BAe 125 aircraft are currently registered in Australia.\n- **Why it matters:** Airworthiness Directives are legally binding safety orders. Even though this one is inactive now, it shows how CASA maintains safety standards and cleans up the regulatory books when aircraft types leave the fleet.\n\nIn short: this is a dormant aircraft safety notice that's been archived because the planes it applies to are no longer flying under Australian registration."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The instrument’s practical scope has been changed from an active AD applying to an in-service aircraft type to a removed entry because the BAe 125 model is not currently on the Australian register. Mechanically, that means there is no present domestic compliance obligation arising from this AD; previously the AD would have imposed mandatory actions on owners/operators of the affected aircraft. (See: removal statement and AD title.)"},"complexity_factors":["Very short source text with no operative technical requirements listed","Narrow applicability to a single aircraft type (BAe 125 Series)","Current removal from the listing eliminates active compliance mechanics in the domestic context","Regulatory context present (Part 39/CASA) but no procedural detail or conditions supplied","No multiple interacting provisions, definitions, or exemptions in the supplied text"],"plain_english_summary":"What this instrument does (mechanically):\n\n- The instrument is an Airworthiness Directive (AD) titled “AD/HS 125/124 Amdt 2 — Wing Top Skin Bolt Holes and Internal Stringers” that applies to British Aerospace BAe 125 Series aeroplanes. By its title, the AD would impose mandatory requirements related to the wing top skin bolt holes and internal stringers on that aircraft type (for example, inspections, repairs or modifications). The AD is issued under the Civil Aviation Regulations 1998, Part 39, and appears in the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives. (See: AD title and CASA/Part 39 header.)\n\nOfficial rationale and current status: \n\n- The published text states: “This AD contents has been removed from the listing because the aircraft model is not currently on the register.” That is the explicit reason given for its removal from the active listing. (See: removal statement.)\n\nWho it affects and who pays:\n\n- Where in force, an AD like this would obligate the registered owner/operators of the affected BAe 125 Series aeroplanes to carry out the specified inspections/repairs/modifications; those owners/operators would bear the direct costs of compliance (labour, parts, downtime). The regulator (CASA) decides the AD and enforces compliance under Part 39. (See: AD title and CASA/Part 39 header; removal statement.)\n\nWhy it matters and practical consequences:\n\n- Purpose claim: The AD’s stated purpose (by implication in its title) is to address a structural integrity issue involving wing top skin bolt holes and internal stringers on BAe 125 Series aeroplanes. If implemented, the measure would change operator behaviour by creating mandatory maintenance/inspection actions and associated compliance costs.\n\n- Current effect: Because the AD has been removed from the listing for the stated reason (the model is not on the register), there is no current active domestic compliance obligation arising from this entry for Australian-registered aircraft. That removes the immediate compliance cost and administrative burden for domestic operators — but it also means CASA has chosen not to keep this AD in the active schedule while there are no registered examples of the type. (See: removal statement.)\n\nImplementation, incentives, and trade-offs to note (source-grounded):\n\n- Compliance burden and who decides: When active, ADs place discrete compliance obligations on aircraft owners/operators; CASA determines and enforces those obligations under Part 39. The source text identifies CASA and Part 39 as the legal context. (See: CASA/Part 39 header.)\n\n- Enforcement discretion and recurrence risk: The listing’s removal is explained by registry absence. If BAe 125 aircraft return to the Australian register, the AD could be reinstated or reissued, restoring compliance obligations and associated costs to operators. The source text does not describe the detailed trigger or process for reinstatement. (See: removal statement.)\n\n- Concentrated benefits and diffuse costs: The primary operational benefit (risk mitigation for the affected aircraft) would accrue to owners, pilots and passengers of the specific BAe 125 aircraft; the cost of compliance would be concentrated on those owners/operators. The AD’s removal shifts those costs to zero in the domestic context while the type remains off the register. (See: AD title; removal statement.)\n\nSources cited from the instrument:\n- AD title and aircraft type: “AD/HS 125/124 Amdt 2 — Wing Top Skin Bolt Holes and Internal Stringers” (British Aerospace BAe 125 Series Aeroplanes).\n- Regulatory context: “COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 — CIVIL AVIATION SAFETY AUTHORITY / SCHEDULE OF AIRWORTHINESS DIRECTIVES.”\n- Current status note: “This AD contents has been removed from the listing because the aircraft model is not currently on the register.”"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers","history":"/api/acts/ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers/history","analysis":"/api/acts/ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers/analysis","conflicts":"/api/acts/ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers/conflicts","importantCases":"/api/acts/ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers/important-cases","documents":"/api/acts/ad-hs-125-124-amdt-2-wing-top-skin-bolt-holes-and-internal-stringers/documents"}}