{"id":"F2006B11388","name":"AD/MU-2/58 - Wing Tip Tank Attachment","slug":"ad-mu-2-58-wing-tip-tank-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57289,"registerId":"commonwealth-F2006B11388-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/58 - Wing Tip Tank Attachment","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-2/58 Wing Tip Tank Attachment 8/96\n\nApplicability: Model MU-2B-10, -15, -20, -25, -26, with serial numbers 008 through 347 (except\n\n313, 321).\n\n \n\nModel MU-2B-30, -35, -36, with serial numbers 501 through 696 (except 652, 661).\n\n \n\nRequirement: Inspect the wing tip tank fitting attachment bolts in accordance with Mitsubishi Heavy Industry MU-2 Service Bulletin 225.\n\n \n\nNote: JCAB TCD-4310-96 refers.\n\n \n\nCompliance: Within 100 hours time in service after 18 July 1996.\n\n \n\nBackground: Incorrect wing tip attachment bolts have been found corroded. Failure of corroded bolts could result in the separation of the wing tip tank from the aircraft.\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":"There is no indication within the text that the directive’s scope was altered from an earlier version. The instrument sets a specific applicability (models and serial numbers), a single inspection requirement tied to a named service bulletin, and a single compliance deadline. No amendments, extensions or narrowing of applicability are stated in the provided text (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability defined by specific MU-2 models and serial-number ranges (Applicability)","Delegation of technical procedure to an external document: Mitsubishi Heavy Industry MU-2 Service Bulletin 225 (Requirement)","Fixed and short compliance window expressed in flight hours and a calendar anchor date (Compliance)","Reference to a foreign authority document (JCAB TCD-4310-96) without further detail (Note)","Absence of technical corrective steps or cost detail within the directive itself (Requirement; Background)"],"plain_english_summary":"What this directive requires\n\n- The Civil Aviation Safety Authority (CASA) requires an inspection of the wing tip tank fitting attachment bolts on certain Mitsubishi MU-2 aeroplanes. (Requirement)\n- The inspection must be carried out in accordance with Mitsubishi Heavy Industry MU-2 Service Bulletin 225. (Requirement)\n- The inspection must be completed within 100 hours time in service after 18 July 1996. (Compliance)\n\nWhich aircraft are affected\n\n- MU-2B-10, -15, -20, -25, -26 with serial numbers 008 through 347, except serials 313 and 321. (Applicability)\n- MU-2B-30, -35, -36 with serial numbers 501 through 696, except serials 652 and 661. (Applicability)\n\nWhy CASA issued this directive (stated reason)\n\n- The directive states that incorrect wing tip attachment bolts have been found corroded and that failure of corroded bolts could result in the wing tip tank separating from the aircraft. (Background)\n- The directive also references JCAB TCD-4310-96. (Note)\n\nWho pays and who decides\n\n- Aircraft owners/operators and their maintenance providers are responsible for arranging and paying for the inspection and any remedial work required to meet the directive, because the Requirement directs compliance using the manufacturer service bulletin. (Requirement)\n- CASA is the issuing authority and enforces the directive as an airworthiness requirement. (header: Civil Aviation Safety Authority; Schedule of Airworthiness Directives)\n\nPractical mechanics, incentives and trade-offs\n\n- The directive delegates the technical method to the manufacturer’s service bulletin (Mitsubishi Heavy Industry MU-2 Service Bulletin 225). Operators must follow that bulletin’s steps to comply; the directive does not set the inspection procedure itself. (Requirement)\n- Time pressure is imposed by the fixed compliance window of 100 hours time in service after 18 July 1996, which creates an operational scheduling obligation for affected aircraft. (Compliance)\n- The stated safety concern (corroded, incorrect bolts) creates an incentive for operators to inspect and, if necessary, replace bolts to avoid the risk of tank separation. (Background)\n\nCompliance burden and implementation risk\n\n- Compliance requires access to the specified service bulletin and the ability to carry out or procure the inspection; if the bulletin prescribes parts replacement, there may be additional parts and labour costs. (Requirement)\n- The directive relies on the service bulletin for technical detail; if the bulletin is ambiguous or unavailable, that could delay or complicate compliance. (Requirement)\n\nWhat the directive does not specify\n\n- The directive does not itself describe corrective measures if corrosion or incorrect bolts are found; it delegates those technical details to the referenced service bulletin. (Requirement)\n- The directive does not quantify costs, specify who must perform the inspection (beyond the implication that operators must comply), or provide follow-up reporting requirements in the text presented. (Requirement; Compliance)\n\nSource citations: Applicability; Requirement; Compliance; Background; Note."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of addressing corroded wing tip tank bolts."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability groups (specific aircraft models and serial numbers)","Single, clear requirement with reference to external technical standard (Service Bulletin 225)","Simple compliance deadline (100 hours time in service from fixed date)","No nested conditions, exceptions, or cross-references to other legislation","Straightforward background explanation with clear safety rationale"],"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 bolts that attach the wing tip fuel tanks to the wings.\n\n**Who it affects:**\nOwners and operators of specific Mitsubishi MU-2 models with particular serial numbers:\n- **MU-2B-10, -15, -20, -25, -26** (serial numbers 008–347, except 313 and 321)\n- **MU-2B-30, -35, -36** (serial numbers 501–696, except 652 and 661)\n\n**What must be done:**\nA visual or physical inspection of the wing tip tank attachment bolts, following the procedure in **Mitsubishi Service Bulletin 225** (a technical instruction from the manufacturer).\n\n**When it must be done:**\nWithin **100 hours of flight time** after 18 July 1996.\n\n**Why it matters:**\nIncorrect bolts have been found **corroded** (rusted/deteriorated). If these bolts fail, the wing tip tank could **fall off the aircraft in flight** — a serious safety hazard.\n\n**Key point:** This is not optional. Airworthiness Directives are legally binding safety requirements. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-58-wing-tip-tank-attachment","history":"/api/acts/ad-mu-2-58-wing-tip-tank-attachment/history","analysis":"/api/acts/ad-mu-2-58-wing-tip-tank-attachment/analysis","conflicts":"/api/acts/ad-mu-2-58-wing-tip-tank-attachment/conflicts","importantCases":"/api/acts/ad-mu-2-58-wing-tip-tank-attachment/important-cases","documents":"/api/acts/ad-mu-2-58-wing-tip-tank-attachment/documents"}}