{"id":"F2006B11390","name":"AD/MU-2/60 Amdt 1 - De-Ice System Modification","slug":"ad-mu-2-60-amdt-1-de-ice-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57291,"registerId":"commonwealth-F2006B11390-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/60 Amdt 1 - De-Ice System Modification","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)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/MU-2/60 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nMitsubishi MU-2 Series Aeroplanes\n\nAD/MU-2/60\n\nAmdt 1\n\n  \nDe-Ice System Modification 12/2002\n\nApplicability: Mitsubishi MU-2B, MU-2B-10, \\-15, \\-20, \\-25, \\-26 S/N 008 to 347 inclusive, except\n\nS/N 313 and 321.\n\nMitsubishi MU-2B-30, \\-35, \\-36 S/N 501 to 696 inclusive, except S/N 652 and 661.\n\nRequirement: Modify the Pneumatic De-Ice system Monitoring System and revise the flight manual in accordance with Mitsubishi Heavy Industries (MHI) MU-2 Service Bulletin 232 Revision A.\n\nNote 1: JCAB AD TCD-4626-97 refers.\n\nCompliance: Unless previously accomplished; within 6 months from the effective date of this Directive.\n\nNote 2: Aircraft in compliance with Service Bulletin 232 require no further action.\n\nThis Airworthiness Directive becomes effective on 28 November 2002.\n\nBackground: This Directive is mandated to ensure that the flight crew is advised of proper functioning of the de- ice system. The system informs the flight crew that the wing and tail pneumatic de- ice boot systems are receiving pressure when the WING DE- ICER switch is selected ON.\n\nThis amendment includes changes to the manufacturers service bulletin. This change clarifies the parts requirements for the installation of the de- icer system.\n\nThe original issue of this Directive became effective 6 November 1997.\n\n![Signature of Barry James Reid McKay Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nBarry James Reid McKay\n\n![](image.001.png)  \nDelegate of the Civil Aviation Safety Authority 18 October 2002\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 6 November 2002.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose — ensuring proper monitoring of the MU-2 de-icing system. The amendment merely updates parts requirements in the referenced service bulletin without expanding the scope to other aircraft systems or additional operational requirements."},"complexity_factors":["Single, clearly defined applicability section with specific aircraft models and serial number ranges","One straightforward requirement referencing an external technical document (Service Bulletin 232 Revision A)","Simple compliance deadline (6 months from effective date) with single exception (already compliant aircraft)","Minimal cross-referencing (only to Japanese aviation authority AD and the service bulletin)","No nested definitions, conditional logic, or complex interpretation provisions","Short document (1 page) with clear structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This CASA Airworthiness Directive replaces AD/MU-2/60 (1997) and requires owners/operators of specified Mitsubishi MU-2B series aeroplanes (excluding S/N 313, 321, 652, 661) to install modified pneumatic de-icing system monitoring equipment and update the flight manual per Service Bulletin 232 Rev A. Compliance was required within six months of 28 November 2002. The change ensures pilots receive a clear warning if wing or tail de-icing boots aren’t being pressurised, closing a known safety gap in icing conditions."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amdt 1 revokes the earlier AD and issues a revised directive that retains the original requirement to modify the de-ice monitoring system but incorporates changes to the manufacturer's service bulletin that clarify parts requirements (Background). The amendment therefore narrows implementation detail (parts/installation) rather than expanding the set of affected aircraft; applicability remains defined by the listed serial-number ranges and exceptions (Applicability)."},"complexity_factors":["Technical modification required to aircraft pneumatic de-ice monitoring system and flight manual (Requirement).","Instruction and parts details delegated to an external manufacturer document: MHI Service Bulletin 232 Rev A (Requirement; Background).","Applicability limited to specific MU-2 serial-number ranges with listed exceptions, creating tailoring and record-check burden (Applicability).","Fixed compliance window of six months from the AD's effective date, imposing scheduling and operational disruption for owners/operators (Compliance).","Revocation of the prior AD and issuance under subregulation 39.1(1) of CAR 1998 creates regulatory continuity but requires checking prior compliance history (introductory text; Compliance; Background).","Compliance cost borne by aircraft owners/operators (implicit in Requirement and Compliance); potential need for parts and installation resources as clarified in amended service bulletin (Background).","Flight manual revision required, raising an administrative compliance step and evidence-retention requirement (Requirement)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Mitsubishi MU-2 serial numbers to modify the pneumatic de-ice system monitoring and update the flight manual according to Mitsubishi Heavy Industries Service Bulletin 232 Revision A. It affects aircraft listed in the applicability and must be done within six months so crews are correctly informed when the wing and tail de-icer boots are pressurised."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-60-amdt-1-de-ice-system-modification","history":"/api/acts/ad-mu-2-60-amdt-1-de-ice-system-modification/history","analysis":"/api/acts/ad-mu-2-60-amdt-1-de-ice-system-modification/analysis","conflicts":"/api/acts/ad-mu-2-60-amdt-1-de-ice-system-modification/conflicts","importantCases":"/api/acts/ad-mu-2-60-amdt-1-de-ice-system-modification/important-cases","documents":"/api/acts/ad-mu-2-60-amdt-1-de-ice-system-modification/documents"}}