{"id":"F2006B10385","name":"AD/HS 125/107 - MLG Sidestay Attachment Lug","slug":"ad-hs-125-107-mlg-sidestay-attachment-lug","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116035,"registerId":"commonwealth-F2006B10385-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/107 - MLG Sidestay Attachment Lug","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 125/107 MLG Sidestay Attachment Lug 4/90\n\nDM\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The effective scope of regulatory obligation narrowed: the AD entry for the BAe 125 MLG sidestay attachment lug has been removed from the active listing because the aircraft model is not on the Australian register. As a result, there are no current listed compliance obligations in this schedule entry for Australian-registered aircraft of that type. The source text ties the change in listing to register status rather than to a technical reassessment of the component (see: \"This AD contents has been removed from the listing because the aircraft model is not currently on the register\")."},"complexity_factors":["Document is procedural and very short — contains no technical requirements or operative inspection/repair steps","Action is administrative (removal from listing) rather than technical, reducing procedural complexity","Dependence on external, time-varying fact (whether the aircraft type is on the register) introduces conditionality","References regulatory framework (Civil Aviation Regulations 1998, Part 39) but does not include cross-referenced operative provisions","Absence of detail about the underlying safety issue or required remedial actions limits technical complexity but increases reliance on external records for context"],"plain_english_summary":"What this instrument is: This entry is an Airworthiness Directive (AD) record titled \"AD/HS 125/107 — MLG Sidestay Attachment Lug\" that was issued for British Aerospace BAe 125 series aeroplanes (listed under the Civil Aviation Regulations 1998, Part 39 — Schedule of Airworthiness Directives). The AD is dated 4/90 and labelled with the identifier \"DM\".\n\nWhat changed mechanically: The AD entry has been removed from the listing. The text states: \"This AD contents has been removed from the listing because the aircraft model is not currently on the register.\" Mechanically, that means the AD is not currently appearing in the active schedule for registered aircraft in Australia (see source line: \"This AD contents has been removed from the listing because the aircraft model is not currently on the register\").\n\nWho it affects and who decides: The primary decision-maker named by the document is the Civil Aviation Safety Authority operating under the Civil Aviation Regulations 1998, Part 39 (see header). If the AD had been active, operators of BAe 125 series aeroplanes on the Australian register would have been the parties required to comply. Because the model is not on the register, there are no current registered-operator compliance obligations recorded in this listing.\n\nWhy it matters (official rationale and practical consequences): The stated rationale for removal is the absence of the aircraft model from the register. The immediate consequence is that there is no active, listed AD obligation for Australian-registered BAe 125 aircraft in respect of the MLG (main landing gear) sidestay attachment lug in this schedule entry. Practically, that reduces immediate administrative and inspection/repair obligations for Australian-registered operators because none are recorded; it also means the schedule does not currently impose any costs or enforcement related to this AD in Australia (see source line cited above).\n\nCosts, incentives and trade-offs (mechanisms, not judgments):\n- Who pays: If the AD were active and an affected aircraft were on the register, the aircraft operator would bear direct costs of inspections, maintenance and any corrective work required by the AD. The source indicates no such operators are currently on the register, so no current operator cost is recorded in this listing (see removal statement).\n- Who decides: The schedule and any listing changes are administered under the Civil Aviation Regulations (Part 39) and the Civil Aviation Safety Authority as the relevant decision-making and listing authority (see header).\n- Behavioural effect: When an AD is listed, registered operators must follow its requirements; when an AD is removed from the schedule because an aircraft type is not registered, the immediate effect is a lack of active listing-based obligations for operators in that jurisdiction. If a BAe 125 were later placed on the register, the existence or re-creation of an AD listing would determine whether operators again face compliance obligations (this is a conditional mechanism implied by the removal reason).\n- Compliance burden and discretion: The removed listing eliminates the immediate compliance burden described by this particular AD entry. The document attributes the removal to register status rather than a technical re-assessment of the component; therefore administrative discretion (by the authority maintaining the schedule) is the operative mechanism for the change in listing status.\n\nImplementation risk and opportunity costs: With the AD removed due to register absence, the implementation and enforcement obligations for Australian authorities and operators are effectively dormant for this item. The trade-off is between maintaining the AD on the public schedule regardless of register status (administrative cost) and removing it while no affected aircraft are registered (reduced immediate administrative burden). The source does not supply technical details about the sidestay lug or any safety findings, so any technical risk assessment is not contained in this text.\n\nWhere this comes from: The summary and procedural action are taken directly from the AD entry header and the removal statement in the provided text (see header referencing Civil Aviation Regulations 1998, Part 39 and the sentence: \"This AD contents has been removed from the listing because the aircraft model is not currently on the register\")."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"Not applicable — this is a withdrawn administrative notice rather than legislation whose scope has evolved."},"complexity_factors":["Document is a stub/placeholder with no operative legal content remaining","No defined terms, cross-references, or conditional provisions present","Single sentence of substantive content explaining removal from register","No legislative provisions, penalties, or compliance requirements currently active"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\n- Originally required inspection or repair of the **main landing gear (MLG) sidestay attachment lug** on British Aerospace BAe 125 series aircraft.\n- The \"sidestay\" is a structural component that helps keep the landing gear in position during flight and landing.\n\n**Current status:**\n- **The directive has been removed from active listing** because the specific aircraft model (British Aerospace BAe 125 series) is no longer registered in Australia.\n- The document now exists only as a placeholder noting this removal.\n\n**Who it affects:**\n- Previously affected owners and operators of BAe 125 aircraft in Australia.\n- Currently affects no one, as no such aircraft remain on the Australian register.\n\n**Why it matters:**\n- Airworthiness Directives are critical safety tools that ground aircraft or mandate repairs when defects are discovered.\n- This shows how aviation safety regulation adapts — when aircraft types leave the fleet, associated directives are cleaned from active lists to avoid confusion, even though the safety requirement would still apply if any aircraft returned to the register."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-107-mlg-sidestay-attachment-lug","history":"/api/acts/ad-hs-125-107-mlg-sidestay-attachment-lug/history","analysis":"/api/acts/ad-hs-125-107-mlg-sidestay-attachment-lug/analysis","conflicts":"/api/acts/ad-hs-125-107-mlg-sidestay-attachment-lug/conflicts","importantCases":"/api/acts/ad-hs-125-107-mlg-sidestay-attachment-lug/important-cases","documents":"/api/acts/ad-hs-125-107-mlg-sidestay-attachment-lug/documents"}}