{"id":"F2006B11359","name":"AD/MU-2/3 Amdt 1 - Integral Fuel Vent Check Valve","slug":"ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57258,"registerId":"commonwealth-F2006B11359-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/3 Amdt 1 - Integral Fuel Vent Check Valve","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nMitsubishi MU-2 Series Aeroplanes\n\nAD/MU-2/3\n\nAmdt 1\n\n  \nIntegral Fuel Vent Check Valve 5/97\n\nApplicability: All model MU-2B, MU-2B-10, MU-2B-15, MU-2B-20 and MU-2B-30 aircraft S/N 004 through 035, 037, 038, 101 through 230, 502 through 525 and 527 through 547.\n\nRequirement: Remove the vent check valve assembly in accordance with Mitsubishi MU-2 Service Bulletin No 130A dated July 19, 1971.\n\nNote: FAA AD 97-04-13 Amdt 39-9938 refers.\n\nCompliance: Unless previously carried out, at the next 100 hour inspection or by 31 December, 1997, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 24 April 1997.\n\nBackground: Initial Directive, raised in July 1971, was based on Mitsubishi SB 130. The directive was raised to mandate compliance with the manufacturers SB after advice that an incorrectly fitted fuel cap could prevent fuel transfer and could result in loss of engine power.\n\nAmendment 1 is raised to add the additional S/N aircraft per Mitsubishi SB 130A. The original issue of this Airworthiness Directive became effective on 31 May 1971.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope—mandating removal of the fuel vent check valve. It simply expands the list of affected aircraft serial numbers to match an updated manufacturer service bulletin. The core safety purpose (preventing fuel transfer issues) remains unchanged."},"complexity_factors":["Single, specific mechanical requirement (remove one valve assembly)","Limited applicability (specific aircraft model and serial number ranges only)","Clear compliance deadline with simple alternative trigger (100-hour inspection OR fixed date)","Only one cross-reference (to FAA AD 97-04-13 and manufacturer Service Bulletin)","No defined terms section, no nested conditions, no exceptions"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of specified Mitsubishi MU-2B series aeroplanes to remove a particular fuel vent check valve assembly per Mitsubishi Service Bulletin No. 130A. The action prevents potential fuel-transfer blockage from an incorrectly fitted fuel cap that could cause engine power loss.\n\nIt’s mandatory for affected serial numbers by the next 100‑hour inspection or 31 December 1997. Amendment 1 widens the original 1971 directive’s applicability."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Yes. Amendment 1 expands the Directive's scope by adding additional aircraft serial numbers per Mitsubishi Service Bulletin 130A. The original Directive (effective 31 May 1971) has been amended to include more S/N aircraft; the current text sets the effective amendment date as 24 April 1997 and retains the original removal requirement."},"complexity_factors":["Narrow applicability defined by specific MU-2B models and detailed serial number ranges (Applicability).","Mandated corrective action is a single technical task: removal of the vent check valve assembly per Mitsubishi SB No. 130A (Requirement).","Clear compliance deadline: next 100‑hour inspection or by 31 December 1997, whichever occurs first (Compliance).","Dependence on manufacturer service bulletin for procedure and scope (Requirement / Background).","Amendment modifies applicability by adding serial numbers (Background / Amendment 1).","Cross-reference to FAA AD creates inter-jurisdictional traceability but no additional procedural steps (Note)."],"plain_english_summary":"Owners/operators of specified Mitsubishi MU-2B series aircraft must remove the integral fuel vent check valve assembly in accordance with Mitsubishi Service Bulletin No. 130A. The directive says removal is to prevent possible fuel-transfer blockage and potential engine power loss. Compliance is required at the next 100‑hour inspection or by 31 December 1997, whichever is earlier, so affected operators must schedule the mandated maintenance and bear its cost and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve","history":"/api/acts/ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve/history","analysis":"/api/acts/ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve/analysis","conflicts":"/api/acts/ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve/conflicts","importantCases":"/api/acts/ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve/important-cases","documents":"/api/acts/ad-mu-2-3-amdt-1-integral-fuel-vent-check-valve/documents"}}