{"id":"F2006B11340","name":"AD/MU-2/12 - Nose Landing Gear Shimmy Damper - Inspection","slug":"ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57221,"registerId":"commonwealth-F2006B11340-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/12 - Nose Landing Gear Shimmy Damper - 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)  Mitsubishi MU-2 Series Aeroplanes\n\n \n\nAD/MU-2/12 Nose Landing Gear Shimmy Damper - Inspection 11/75\n\nApplicability: All models.\n\n \n\nDocument: 1. Mitsubishi SB No. 169; or\n\n \n\n2. Japan Civil Aviation Bureau AD No. TCD-1209-75. Compliance: Within 25 hours time in service after 13 November 1975.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":3,"scope_assessment":{"changed":false,"description":"The supplied text sets a single, time‑bound inspection requirement for all Mitsubishi MU‑2 models and cites two documents that describe the inspection. There is no indication in the text that the scope was altered from an earlier or original version; the AD as provided appears to state the intended scope (inspection of the nose landing gear shimmy damper for all models, within the specified compliance window) without amendments or scope expansions shown in the text."},"complexity_factors":["Narrow, single‑action requirement (one inspection) reduces procedural complexity.","Reference to external documents (Mitsubishi SB No. 169 or Japan CAB AD No. TCD‑1209‑75) requires obtaining and interpreting other texts, adding administrative complexity.","A strict, short compliance window (within 25 hours time in service after 13 November 1975) creates scheduling and operational constraints.","Lack of detailed inspection procedure or corrective-action text in the AD increases reliance on maintenance judgement and the referenced documents.","Applicability to all MU‑2 models widens operational coverage but keeps technical scope focused on one component."],"plain_english_summary":"What this instrument does, mechanically\n\n- This is an Airworthiness Directive titled \"AD/MU-2/12 Nose Landing Gear Shimmy Damper - Inspection\" issued under the Commonwealth Civil Aviation safety regime. It requires an inspection of the nose landing gear shimmy damper on Mitsubishi MU‑2 series aeroplanes. (AD/MU-2/12 title; Applicability: All models.)\n\n- The directive makes the inspection mandatory for all MU‑2 models and specifies the acceptable inspection procedures by reference: either Mitsubishi Service Bulletin No. 169 or Japan Civil Aviation Bureau AD No. TCD‑1209‑75. (Document: Mitsubishi SB No. 169; or Japan CAB AD No. TCD‑1209‑75.)\n\n- The inspection must be carried out within 25 hours time in service after 13 November 1975. No further recurring interval is stated in the text provided. (Compliance: Within 25 hours time in service after 13 November 1975.)\n\nWho this affects and who decides\n\n- Affected parties: owners and operators of Mitsubishi MU‑2 series aeroplanes (Applicability: All models). They are the parties that must arrange and pay for the inspection and any corrective work discovered by that inspection.\n\n- Authority: the Civil Aviation Safety Authority (CASA) issues this as a Schedule of Airworthiness Directives under the Civil Aviation Regulations regime. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - CIVIL AVIATION SAFETY AUTHORITY Schedule of Airworthiness Directives.)\n\nWhy it matters (official claim and practical implications)\n\n- The directive’s title and references indicate the action is intended to inspect the nose landing gear shimmy damper. The official claim (implicit in the title and referenced documents) is that inspecting this component is necessary to address a safety or airworthiness concern. That claim is recorded by the AD but the text supplied does not include a technical justification or consequences of non‑inspection beyond the requirement itself.\n\n- Practical effects and trade‑offs:\n  - Operators must ground or schedule affected aircraft for an inspection within the specified 25‑hour window, creating opportunity cost in aircraft availability and maintenance labour time. (Compliance requirement.)\n  - The inspection procedure is not reproduced in the AD text; compliance requires obtaining and following one of the two referenced documents. That creates administrative effort and possibly a fee to access or interpret the referenced service bulletin or foreign AD. (Document: Mitsubishi SB No. 169; or Japan CAB AD No. TCD‑1209‑75.)\n  - If the inspection identifies defects, operators will incur additional repair costs and downtime; the AD does not itself state corrective actions in the provided text, so operators must follow the referenced documents for any mandated follow‑up.\n  - The directive imposes a discrete, time‑bound obligation (a one‑time inspection within 25 hours TIS after the specified date). The absence of any recurring interval or prescriptive corrective action in the text may require maintenance providers or operators to interpret the referenced documents to know the full scope of required work.\n\nCompliance burden, discretion and risks\n\n- Who pays: owners/operators pay for the inspection and any subsequent corrective work; they also bear aircraft downtime between scheduling and completion of the inspection. (Applicability; Compliance.)\n\n- Who decides: CASA issues the AD and specifies the referenced documents; maintenance organizations or licensed engineers carry out the inspection and decide on corrective action consistent with the referenced documents. (Authority: Schedule of Airworthiness Directives; Document references.)\n\n- Implementation risk and ambiguity: the AD text provided does not include the inspection procedure itself nor any explicit corrective actions; it relies on external documents. That reliance creates administrative steps (obtain, interpret, apply the referenced documents) and some discretion for maintenance personnel in interpreting and executing requirements.\n\nNet behavioural effect\n\n- Operators must prioritise and schedule the specified inspection within the stated 25‑hour window and follow the referenced documents for how to perform the inspection and any corrective steps. This changes operator behaviour by requiring near‑term maintenance action on all MU‑2 aircraft regardless of individual operator maintenance programs. (Compliance; Document references.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1975 addressing a specific mechanical component. It has not expanded beyond its original purpose of ensuring shimmy damper integrity on MU-2 aircraft."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined references (Mitsubishi SB No. 169 and JCAB AD No. TCD-1209-75)","Single, clear compliance requirement with specific deadline","No nested exceptions or conditional logic","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward applicability statement ('All models')"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nIt requires owners and operators of **Mitsubishi MU-2 series aeroplanes** to inspect the **nose landing gear shimmy damper** — a component that prevents the front wheel from wobbling or vibrating dangerously during takeoff, landing, or taxiing.\n\n**Who it affects:**\n- All owners and operators of Mitsubishi MU-2 aircraft models\n- Maintenance organisations servicing these aircraft\n\n**What must be done:**\n- Inspect the nose landing gear shimmy damper following either:\n  - **Mitsubishi Service Bulletin No. 169**, or\n  - **Japan Civil Aviation Bureau AD No. TCD-1209-75**\n- Complete the inspection **within 25 hours of flight time** after 13 November 1975\n\n**Why it matters:**\nShimmy dampers are critical safety devices. If they fail, the nose wheel can oscillate violently, potentially causing loss of control, structural damage, or runway accidents. This AD ensures a known defect is caught before it causes an incident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection","history":"/api/acts/ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection/history","analysis":"/api/acts/ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection/analysis","conflicts":"/api/acts/ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection/conflicts","importantCases":"/api/acts/ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection/important-cases","documents":"/api/acts/ad-mu-2-12-nose-landing-gear-shimmy-damper-inspection/documents"}}