{"id":"F2006B11352","name":"AD/MU-2/23 - Nose Landing Gear Retracting Mechanism - Inspection","slug":"ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57244,"registerId":"commonwealth-F2006B11352-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/23 - Nose Landing Gear Retracting Mechanism - 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-2/23 Nose Landing Gear Retracting Mechanism - Inspection\n\n\n11/81\n\n \n\nApplicability: All models MU-2B/-10/-15/-20/-25/-26 with S/Nos. 005 to 347 except S/Nos. 313 and 321. All models MU-2B-30/-35/-36 with S/Nos. 501 to 696 (except S/Nos. 652\n\nand 661).\n\n \n\nRequirement: To prevent the possible failure of the NLG retracting mechanism perform the following:\n\n \n\n1. Inspect the NLG retracting mechanism down lock system in accordance with Mitsubishi MU-2 SB No. 188 dated 13 July 1981.\n\n \n\nNote: JCAB AD No. TCD-2070-81 refers.\n\n \n\nCompliance: Unless already accomplished, within 100 hours time in service after 30 September 1981.\n\n \n\nBackground: The nose landing gear down lock system may be improperly adjusted.\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":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — a targeted safety inspection for a specific mechanical issue on specific aircraft. There is no evidence of scope creep; it does exactly what it says on the tin."},"complexity_factors":["Single, specific technical requirement (one inspection)","Limited applicability — only affects specific aircraft models and serial number ranges","No nested exceptions or conditional logic beyond the serial number exclusions","Clear compliance deadline (100 hours time in service after fixed date)","No defined terms section or extensive cross-referencing to other legislation","Short document — approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Mitsubishi MU-2 aeroplanes** to inspect the **nose landing gear (NLG) retracting mechanism** — specifically the \"down lock system\" that keeps the front wheel locked in place when extended for landing.\n\n**Who it affects:**\nOwners and operators of Mitsubishi MU-2B series aircraft with specific serial numbers (roughly manufactured between serial numbers 005–347 and 501–696, with a few exceptions).\n\n**Why it matters:**\nThe nose landing gear down lock system may be **improperly adjusted**, which could cause the front wheel to collapse or fail to lock properly during landing — a serious safety risk.\n\n**What must be done:**\n- Inspect the mechanism following **Mitsubishi Service Bulletin No. 188** (dated 13 July 1981)\n- Complete this inspection **within 100 flight hours** after 30 September 1981 (unless already done)\n\n**Key point:** This is a **retrospective safety fix** — it applies to aircraft already in service and mandates a specific technical inspection to prevent mechanical failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to the listed MU-2 models and serial numbers and prescribes an inspection per SB No. 188; the instrument itself does not indicate any change or expansion of that scope."},"complexity_factors":["Technical inspection requirement that must follow an external manufacturer document (`Mitsubishi MU-2 SB No. 188`) — requires technical maintenance procedures.","Narrow applicability tied to specific MU-2 models and enumerated serial numbers (Applicability paragraph) — operators must check aircraft identity.","Short compliance window: within 100 hours time in service after 30 September 1981 (Compliance paragraph) — creates scheduling pressure.","Safety driver: prevents possible NLG retracting-mechanism failure; inspection may reveal improper adjustment (Background paragraph), implying potential follow-on adjustments/repairs.","Regulatory cross-reference to a Japanese authority AD (JCAB AD No. TCD-2070-81) — indicates alignment with another regulator rather than creating new technical detail."],"plain_english_summary":"This AD requires owners/operators of specified Mitsubishi MU‑2 serial numbers to inspect the nose landing gear (NLG) retracting‑mechanism down‑lock system in accordance with `Mitsubishi MU‑2 SB No. 188`. It aims to prevent possible NLG retracting‑mechanism failure; operators must comply within 100 hours time in service after 30 September 1981 and therefore bear the inspection, adjustment or repair costs and scheduling impact."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection","history":"/api/acts/ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection/history","analysis":"/api/acts/ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection/analysis","conflicts":"/api/acts/ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection/conflicts","importantCases":"/api/acts/ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection/important-cases","documents":"/api/acts/ad-mu-2-23-nose-landing-gear-retracting-mechanism-inspection/documents"}}