{"id":"F2006B11320","name":"AD/MSR/21 - Front Seat Support Beam Protection - Installation","slug":"ad-msr-21-front-seat-support-beam-protection-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57177,"registerId":"commonwealth-F2006B11320-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/21 - Front Seat Support Beam Protection - Installation","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)  Aerospatiale Rallye Series Aeroplanes\n\n \n\nAD/MSR/21 Front Seat Support Beam Protection - Installation 7/74\n\nApplicability: All models.\n\n \n\nRequirement: Install a front seat support beam protection cover in accordance with a scheme approved by the Secretary.\n\n \n\nCompliance: Within 100 hours time in service after 30 August 1974.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text does not indicate any change from an earlier or different scope. The directive explicitly applies to \"All models\" and prescribes installation of the front seat support beam protection cover under an approved scheme with a fixed compliance window (Applicability, Requirement, Compliance). There is no language in the provided text suggesting an amendment or narrowing/expansion of scope from an original intent."},"complexity_factors":["Short, narrowly focused requirement: single retrofit action (install cover) (Requirement).","Broad applicability: applies to every Aerospatiale Rallye model, widening affected parties (Applicability).","Delegation of technical detail to a Secretary-approved scheme introduces administrative discretion and dependence on an external document (Requirement).","Time-limited compliance tied to aircraft hours introduces operational scheduling and tracking needs for operators (Compliance).","Lack of embedded technical specifications, enforcement provisions, funding or supplier rules increases uncertainty for implementers despite the directive's brevity."],"plain_english_summary":"What this instrument does, in plain language:\n\n- This is an airworthiness directive that applies to all Aerospatiale Rallye series aeroplanes (Applicability). It requires that a front seat support beam protection cover be installed (Requirement).\n\n- The installation must follow a scheme that is approved by the Secretary. The directive does not itself include the technical design or installation steps; it refers to an externally approved scheme that must be followed (Requirement).\n\n- Aircraft owners/operators must comply within 100 hours time in service measured after 30 August 1974 (Compliance).\n\nWho pays and who decides:\n\n- Aircraft owners or operators are the parties required to carry out the installation and therefore will bear the direct costs of purchasing parts and arranging installation (Requirement). The text does not provide funding, subsidies, or exemptions.\n\n- The Secretary (a named decision-maker in the text) is the authority with the power to approve the installation scheme. That approval determines the acceptable technical method for compliance (Requirement).\n\nHow it works mechanically and what it changes:\n\n- Before the deadline, each applicable aeroplane must have a front seat support beam protection cover fitted according to the approved scheme. The directive fixes who must act (owners/operators), what they must do (install the cover as per scheme), and by when they must do it (within 100 hours time in service after 30 August 1974) (Applicability, Requirement, Compliance).\n\nStated purpose and practical implications to consider:\n\n- The instrument itself sets the installation requirement but does not state a narrative explanation of why the cover is required. The directive delegates the technical specification to a Secretary‑approved scheme (Requirement).\n\n- Delegating technical detail to an approved scheme concentrates technical decision-making authority with the Secretary. That creates an administrative step: the approved scheme must exist and be accessible for operators and maintainers to follow (Requirement).\n\nCosts, incentives and trade-offs implied by the text:\n\n- Direct cost: operators pay for the cover and its installation (Requirement). The text does not specify who supplies the cover or whether certified parts are required beyond the approved scheme.\n\n- Compliance burden: operators must track time-in-service to meet the 100‑hour deadline (Compliance), and installers (including independent maintenance businesses) must satisfy the approved scheme when carrying out work (Requirement).\n\n- Discretion and implementation risk: because the directive refers to a scheme \"approved by the Secretary,\" practical compliance depends on the timing, content and availability of that approved scheme. If the scheme is not yet published or is changed, operators face uncertainty about what satisfies the directive (Requirement).\n\n- Market effects: the requirement imposes a uniform retrofit across all models (Applicability). That creates demand for the protective cover and installation services; independent maintenance providers can compete to supply and fit the part provided they meet the approved scheme. The text contains no instructions about certification of suppliers, pricing, or compensation, so those commercial details remain governed by normal market and contractual relations.\n\nWhat the text does not provide (and therefore creates operational gaps):\n\n- No technical detail for the cover or installation method is included in the directive itself; compliance depends on the separate approved scheme (Requirement).\n- No penalties, inspection regime or enforcement mechanics are specified in the text provided.\n- No funding or cost-sharing arrangements are described.\n\nCited source text passages: Applicability: \"All models.\" Requirement: \"Install a front seat support beam protection cover in accordance with a scheme approved by the Secretary.\" Compliance: \"Within 100 hours time in service after 30 August 1974.\""},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose safety directive focused specifically on seat support beam protection for one aircraft series. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Extremely short document (under 150 words)","Only one substantive requirement (install a cover)","No defined terms section","No cross-references to other legislation or regulations","Simple, unconditional directive with single compliance deadline","Minimal conditional logic (only applicability criterion is 'All models')"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it requires:** Owners or operators of Aerospatiale Rallye series aeroplanes must install a protective cover over the front seat support beam. This cover must be installed according to a design or plan that has been officially approved by the Secretary (a senior government official, likely within the Department of Transport or CASA at the time).\n\n**Who it affects:** Anyone who owns, operates, or maintains any model of Aerospatiale Rallye aircraft.\n\n**When it had to be done:** The work had to be completed within 100 hours of flight time after 30 August 1974.\n\n**Why it matters:** Seat support beams are structural components that hold the pilot and passenger seats in place. Without protection, these beams could be damaged by wear, corrosion, or impact — potentially compromising seat integrity during turbulence or an accident. This directive ensures a physical barrier protects this critical structure, reducing the risk of seat failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-21-front-seat-support-beam-protection-installation","history":"/api/acts/ad-msr-21-front-seat-support-beam-protection-installation/history","analysis":"/api/acts/ad-msr-21-front-seat-support-beam-protection-installation/analysis","conflicts":"/api/acts/ad-msr-21-front-seat-support-beam-protection-installation/conflicts","importantCases":"/api/acts/ad-msr-21-front-seat-support-beam-protection-installation/important-cases","documents":"/api/acts/ad-msr-21-front-seat-support-beam-protection-installation/documents"}}