{"id":"F2006B11384","name":"AD/MU-2/54 - Tip Tank Wiring Conduit","slug":"ad-mu-2-54-tip-tank-wiring-conduit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57285,"registerId":"commonwealth-F2006B11384-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/54 - Tip Tank Wiring Conduit","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-2/54 Tip Tank Wiring Conduit 2/94\n\nApplicability: MU-2B-10, -15, -20, -25 and -26 S/N 008 through 347 (except S/N 313 and 321) and\n\nMU/2B/-30, -35 and -36 S/N 501 through 696 (except S/N 652 and 661).\n\n \n\nRequirement: Unless previously carried out action in accordance with Mitsubishi MU-2 Service Bulletin No 221.\n\n \n\nNote: JCAB TCD-3901-93 refers.\n\n \n\nCompliance: Within 100 hours time in service from 28 February 1994.\n\n \n\nBackground: The manufacturer has advised that due to corrosion in the conduit which carries the navigation light and fuel low level switch wiring which could allow fuel to leak into the wiring conduit.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating a repair to prevent fuel leaks in tip tank wiring conduits."},"complexity_factors":["Single, unambiguous requirement referencing an external technical document (Service Bulletin No. 221)","Narrow applicability limited to specific aircraft models and serial number ranges","Simple compliance deadline (100 hours time in service from a fixed date)","No defined terms section, no cross-references to other legislation, no conditional logic or exceptions beyond the explicit serial number exclusions","Total length: approximately 150 words of substantive content"],"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) for specific Mitsubishi MU-2 aircraft.\n\n**What it does:** It requires owners and operators of certain Mitsubishi MU-2 aeroplanes to carry out a specific repair or inspection. The work involves following **Mitsubishi MU-2 Service Bulletin No. 221**, which addresses a problem with the wiring conduit (a protective tube or channel) that runs through the aircraft's tip tanks (fuel tanks at the wingtips).\n\n**Why it matters:** The manufacturer discovered that **corrosion** (rust or deterioration) in this conduit could allow fuel to leak into the wiring that powers the navigation lights and fuel low-level warning system. This creates a fire hazard and could cause critical safety systems to fail.\n\n**Who must comply:** Owners/operators of specific MU-2B models with serial numbers in the listed ranges. The directive excludes certain serial numbers (313, 321, 652, and 661).\n\n**When:** The work must be completed within **100 hours of flight time** after 28 February 1994.\n\n**Key point:** This is not optional. Airworthiness Directives are legally binding safety requirements. Ignoring them means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies to a defined set of MU-2 model variants and serial numbers and requires corrective action in accordance with Mitsubishi Service Bulletin No. 221 to address the corrosion risk described by the manufacturer (Applicability; Requirement; Background). The instrument confines action to the stated airframes and relies on the manufacturer’s bulletin for technical detail, which is consistent with the stated safety purpose rather than expanding or narrowing scope beyond that stated purpose."},"complexity_factors":["Narrow applicability by specific models and serial-number ranges, with a small number of serial-number exceptions (Applicability).","Mandates performance of a manufacturer service bulletin rather than prescribing technical repair steps in the AD itself, requiring operators to obtain and follow the bulletin (Requirement).","Short, fixed compliance window tied to flight hours from a specific date (100 hours from 28 February 1994) which can create scheduling pressure for operators and maintenance providers (Compliance).","Compliance depends on prior completion: the AD exempts aircraft already modified in accordance with Service Bulletin No. 221, requiring operators to show evidence of prior work (Requirement).","Technical nature of the underlying defect (corrosion allowing fuel into wiring conduit) requires qualified maintenance actions rather than simple operator checks, increasing the practical burden (Background).","Cross-reference to an external authority document (JCAB TCD-3901-93) introduces an additional document to consult for context or detail (Note)."],"plain_english_summary":"Owners/operators of specified Mitsubishi MU-2 serial-numbered variants must have the corrective work in Mitsubishi Service Bulletin No. 221 carried out on the tip‑tank wiring conduit within 100 hours TIS from 28 Feb 1994 (unless already done). It affects those owners/operators and the maintenance organisations that perform the work.\n\nThe action responds to reported conduit corrosion that could allow fuel into wiring. Owners bear the cost, downtime and paperwork; the AD mandates compliance while leaving technical repairs to the Service Bulletin and qualified maintainers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-54-tip-tank-wiring-conduit","history":"/api/acts/ad-mu-2-54-tip-tank-wiring-conduit/history","analysis":"/api/acts/ad-mu-2-54-tip-tank-wiring-conduit/analysis","conflicts":"/api/acts/ad-mu-2-54-tip-tank-wiring-conduit/conflicts","importantCases":"/api/acts/ad-mu-2-54-tip-tank-wiring-conduit/important-cases","documents":"/api/acts/ad-mu-2-54-tip-tank-wiring-conduit/documents"}}