{"id":"F2006B11313","name":"AD/MSR/15 Amdt 1 - Elevator Bell Crank - Replacement","slug":"ad-msr-15-amdt-1-elevator-bell-crank-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57164,"registerId":"commonwealth-F2006B11313-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/15 Amdt 1 - Elevator Bell Crank - Replacement","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/15\n\nAmdt 1\n\n\nElevator Bell Crank - Replacement 11/71\n\n \n\nApplicability: All models prior to S/No. 1874. Document:  Rallye SB No. 92.\n\nCompliance: Within 100 hours time in service or three months after 31 December 1971, whichever occurs first.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 instrument is labelled as Amendment 1 (Amdt 1) to AD/MSR/15, indicating it modifies a prior directive. The text provided specifies applicability (aircraft prior to S/No. 1874), references Rallye SB No. 92 for the replacement procedure, and sets the compliance window (100 hours TIS or three months after 31 December 1971). The document itself does not state what differed from the original AD, only that this is the first amendment to AD/MSR/15."},"complexity_factors":["Single, discrete required action (replacement of a specific part)","Clear applicability by serial number (all models prior to S/No. 1874)","Fixed, short compliance window (100 hours TIS or three months after 31 December 1971)","Technical details and parts specifications are delegated to a single referenced Service Bulletin (Rallye SB No. 92)","No exemptions, alternatives, or procedural complexities stated in the text"],"plain_english_summary":"### What this instrument does (mechanics)\n\nThis is an airworthiness directive titled \"Elevator Bell Crank - Replacement\" (AD/MSR/15 Amdt 1). It requires replacement of the elevator bell crank on Aerospatiale Rallye series aeroplanes that have serial numbers prior to 1874. The required work is to be carried out in accordance with \"Rallye SB No. 92\" (see \"Applicability\" and \"Document\").\n\nThe directive sets a fixed compliance window: the replacement must be done within 100 hours time in service or within three months after 31 December 1971, whichever comes first (see \"Compliance\").\n\n### Who is affected\n\nOwners/operators and maintenance organisations responsible for Aerospatiale Rallye aeroplanes with serial numbers before 1874 are the parties required to ensure the replacement is performed (see \"Applicability\" and \"Compliance\"). The directive is issued under the Commonwealth schedule of airworthiness directives.\n\n### Why it matters (stated purpose and operational effect)\n\nThe instrument is part of the Schedule of Airworthiness Directives and therefore directs a mandatory maintenance action affecting aircraft airworthiness. The document itself does not set out a narrative explanation of the underlying condition; it prescribes the replacement action and the deadline for compliance (see header and the Compliance line).\n\n### Practical implications, costs, incentives and trade-offs\n\n- Who pays and who acts: The party responsible for the aircraft's maintenance (typically the owner/operator or their contracted maintenance organisation) must arrange and pay for the replacement. The directive text ties the required procedure to Rallye SB No. 92 (see \"Document\").\n\n- Compliance burden and timing: The requirement sets a concrete timing constraint (100 hours TIS or three months after 31 December 1971). Operators must schedule the work within that window, which may require altering planned flight hours or arranging maintenance sooner than otherwise planned (see \"Compliance\").\n\n- Information and implementation: The directive references Rallye SB No. 92 as the governing document for the replacement. That means the specific technical steps, parts specification, and acceptance criteria are contained in that Service Bulletin (see \"Document\"). Operators must obtain and follow that SB to complete the action.\n\n- Discretion and alternatives: The text contains no exemptions, alternative compliance methods, or deferral provisions. The directive therefore imposes a binary requirement to accomplish the replacement within the stated period (no alternative outcomes are specified in the instrument itself).\n\n- Effects on private choice and business operations: Operators lose the option to defer or omit the replacement beyond the stated deadline; they must allocate maintenance resources and likely incur parts and labour costs within the compliance window (see \"Compliance\" and \"Document\").\n\n### Implementation risks and trade-offs\n\n- Scheduling risk: The fixed deadline creates a short planning horizon for affected operators (100 hours TIS or three months after 31 December 1971). If parts or qualified maintenance capacity are limited, operators may face disruption to planned operations.\n\n- Dependence on referenced service bulletin: The actual technical requirements and parts are in Rallye SB No. 92; successful compliance depends on access to and correct application of that bulletin (see \"Document\").\n\n(References: Applicability; Document: Rallye SB No. 92; Compliance.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive focused on a specific mechanical component in a specific aircraft series. It has not expanded beyond its original purpose of mandating replacement of a defective elevator bell crank."},"complexity_factors":["Extremely short document (under 150 words)","Only one substantive requirement (replace one component)","Simple binary applicability test (serial number threshold)","Single cross-reference to manufacturer service bulletin","Straightforward compliance deadline with simple 'whichever occurs first' logic","No defined terms section, no nested conditions, no exceptions"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it requires:** Owners and operators of certain **Aerospatiale Rallye series aeroplanes** (specifically, those built before serial number 1874) must **replace the elevator bell crank** — a mechanical component that helps control the aircraft's pitch (up/down movement).\n\n**Why it matters:** The elevator bell crank is critical for safe flight control. This AD was issued to prevent potential mechanical failure that could lead to loss of control.\n\n**Who must comply:** Anyone operating the affected aircraft models.\n\n**Deadline:** The replacement must be done **within 100 hours of flight time** OR **three months after 31 December 1971** — whichever comes first. (Note: This deadline has long passed; this is a historical directive.)\n\n**How to comply:** Follow the instructions in **Rallye Service Bulletin No. 92** — the manufacturer's official technical guidance for this repair."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-15-amdt-1-elevator-bell-crank-replacement","history":"/api/acts/ad-msr-15-amdt-1-elevator-bell-crank-replacement/history","analysis":"/api/acts/ad-msr-15-amdt-1-elevator-bell-crank-replacement/analysis","conflicts":"/api/acts/ad-msr-15-amdt-1-elevator-bell-crank-replacement/conflicts","importantCases":"/api/acts/ad-msr-15-amdt-1-elevator-bell-crank-replacement/important-cases","documents":"/api/acts/ad-msr-15-amdt-1-elevator-bell-crank-replacement/documents"}}