{"id":"F2006B11344","name":"AD/MU-2/16 - Main Landing Gear Drag Strut - Inspection","slug":"ad-mu-2-16-main-landing-gear-drag-strut-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57226,"registerId":"commonwealth-F2006B11344-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/16 - Main Landing Gear Drag Strut - 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-2/16 Main Landing Gear Drag Strut - Inspection 4/76\n\nApplicability: All models with S/Nos. 005 to 337 and 501 to 692. Document:  Mitsubishi SB No. 173.\n\nCompliance: Within 100 hours time in service after 31 May 1976.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to requiring an inspection of the main landing gear drag strut for Mitsubishi MU-2 aeroplanes with specified serial numbers, to be performed according to Mitsubishi Service Bulletin No. 173 within 100 hours time in service after 31 May 1976. The document does not indicate any expansion or narrowing of that scope beyond these stated applicability, document reference, and compliance timeframe provisions (see \"Applicability...\", \"Document...\", and \"Compliance...\")."},"complexity_factors":["Narrow applicability limited to specific serial-number ranges (S/Nos. 005–337 and 501–692). (See: \"Applicability: All models with S/Nos. 005 to 337 and 501 to 692.\")","Single required action (inspection) rather than a multi-step regulatory regime; straightforward compliance instruction. (See: title and compliance line.)","Compliance depends on an external technical document (Mitsubishi Service Bulletin No. 173), which concentrates technical detail outside the directive and can introduce complexity in practice. (See: \"Document: Mitsubishi SB No. 173.\")","Fixed, short compliance window tied to flight hours after a specific date (100 hours after 31 May 1976) requiring operators to track time-in-service accurately. (See: \"Compliance: Within 100 hours time in service after 31 May 1976.\")","Historic timing reference (the deadline is relative to a past calendar date) may complicate record checks for retrospective compliance verification. (See compliance text.)"],"plain_english_summary":"This Civil Aviation Safety Authority airworthiness directive mandates inspection of the main landing gear drag strut on Mitsubishi MU-2 aeroplanes (S/N 005–337 and 501–692) in accordance with Mitsubishi Service Bulletin No. 173.\n\nInspections must be completed within 100 hours time-in-service after 31 May 1976; aircraft owners/operators and maintenance providers bear the costs and must follow the service bulletin or an approved alternative to maintain airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused solely on inspecting one specific aircraft component. It has not expanded beyond its original purpose of addressing a known safety concern with the MU-2 landing gear drag strut."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory content","No defined terms section — uses plain language and references external technical document (Mitsubishi SB No. 173)","Single, unambiguous compliance requirement (100 hours time in service)","Clear applicability criteria (specific serial number ranges)","No cross-references to other legislation, regulations, or conditional logic","No exceptions, exemptions, or nested provisions"],"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) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Mitsubishi MU-2 aircraft to inspect the **main landing gear drag strut** (a structural component that helps support the landing gear during flight and landing). The inspection must follow instructions in **Mitsubishi Service Bulletin No. 173**.\n\n**Who it affects:** Owners and operators of Mitsubishi MU-2 series aeroplanes with **serial numbers 005 to 337 and 501 to 692**.\n\n**Why it matters:** Landing gear failures can be catastrophic. This directive ensures a potential defect in the drag strut is identified before it causes an accident. Compliance is **legally mandatory** — you cannot fly the aircraft until the inspection is done.\n\n**When to comply:** Within **100 hours of flight time** after 31 May 1976. (Note: This is a historical directive from 1976, so for current operations, this would have been completed long ago unless the aircraft was newly imported or returned to service.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-16-main-landing-gear-drag-strut-inspection","history":"/api/acts/ad-mu-2-16-main-landing-gear-drag-strut-inspection/history","analysis":"/api/acts/ad-mu-2-16-main-landing-gear-drag-strut-inspection/analysis","conflicts":"/api/acts/ad-mu-2-16-main-landing-gear-drag-strut-inspection/conflicts","importantCases":"/api/acts/ad-mu-2-16-main-landing-gear-drag-strut-inspection/important-cases","documents":"/api/acts/ad-mu-2-16-main-landing-gear-drag-strut-inspection/documents"}}