{"id":"F2006B11383","name":"AD/MU-2/53 Amdt 1 - Ice Detector System Installation","slug":"ad-mu-2-53-amdt-1-ice-detector-system-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57284,"registerId":"commonwealth-F2006B11383-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/53 Amdt 1 - Ice Detector System Installation","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-2/53\n\nAmdt 1\n\n  \nIce Detector System Installation 4/95\n\nApplicability: MU-2B-25/-26/-26A/-40 S/N 313SA, 321SA, 348SA through 459SA. (Refer to SB No 080/30-003A).\n\nMU-2B-35/-36/-36A/-60 S/N 652SA, 661SA, 698SA through 1569SA. (Refer to SB No 080/30-003A).\n\nMU-2B-10/-15/-20/-25/-26 S/N 008 through 347 (except S/N 313, 321). (Refer to SB No 217A).\n\nMU-2B-30/-35/-36 S/N 501 through 696 (except S/N 652,661). (Refer to SB No 217A).\n\nRequirement: 1. Install Ice Detector System in accordance with the requirements of MU-2 Service Bulletin No 080/30-003A or No 217A as applicable.\n\n2. Until Compliance with Requirement 1, a placard is to be installed in clear view of the pilot stating:\n\n“FLIGHT INTO KNOWN OR FORECAST ICING CONDITIONS IS PROHIBITED” and\n\nInsert a “P” amendment to the Limitations Section of the Flight Manual. This amendment is available from District Airworthiness Offices.\n\nNote: The placard is only required until the modification has been incorporated.\n\nCompliance: 1. Prior to 31 December 1995.\n\n2. Prior compliance with the initial issue of this AD satisfies Requirement 2.\n\nBackground: Failure to detect ice build-up on the aircraft by the pilot may result in failure to use or the improper use of the anti-ice/de-ice equipment. This could result in loss of control of the aircraft. The Directive was issued to prevent loss of control of the aircraft as a result of undetected ice accretion.\n\nThis amendment requires installation of an ice detector system as terminating action.","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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The amendment converts earlier interim operational controls (placard and temporary Flight Manual restriction) into a mandatory terminating requirement to install an ice detector system per the specified Service Bulletin. The placard requirement remains only until the modification is incorporated (Requirement 1–2; Background)."},"complexity_factors":["Targeted applicability by specific MU‑2 models and serial numbers (Applicability) — requires operators to verify serial-number coverage before acting.","Normative dependence on external documents (Requirement 1 refers to Mitsubishi Service Bulletin No 080/30-003A or No 217A) — the Service Bulletins contain the technical detail and parts lists required to comply.","Interim operational restriction (Requirement 2) — placard and Flight Manual amendment immediately constrain pilot behaviour until modification is completed.","Fixed compliance deadline (Compliance: prior to 31 December 1995) — creates time pressure for operators to source parts and arrange maintenance.","Administrative step for Flight Manual amendment (Requirement 2) — amendment is issued via District Airworthiness Offices, adding an administrative compliance task.","Change of regulatory end‑state (Background) — this amendment designates installation as terminating action, altering earlier temporary measures."],"plain_english_summary":"This directive requires operators of specified Mitsubishi MU‑2 aeroplanes to install an ice‑detector system according to the applicable Mitsubishi Service Bulletin by 31 December 1995. Until the modification is fitted, aircraft must carry a cockpit placard prohibiting flight into known or forecast icing and a temporary Flight Manual \"P\" amendment. The immediate compliance cost and installation burden fall on aircraft owners/operators; pilots must avoid icing conditions until the detector is installed. The stated safety aim is to reduce the risk of undetected ice accretion leading to loss of control."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment adds the ice detector installation as 'terminating action'—meaning once installed, the interim placard requirement ends. The scope remains tightly focused on the original safety issue (ice detection) and has not expanded beyond the specific aircraft models originally targeted."},"complexity_factors":["Short, single-purpose directive (2 requirements plus interim placard requirement)","Limited applicability clearly specified by aircraft model and serial number ranges","Only 2 cross-references to manufacturer service bulletins (SB No 080/30-003A and SB No 217A)","No defined terms section or interpretation provisions","Simple conditional logic: Requirement 2 (placard) only applies until Requirement 1 (installation) is completed","Single compliance date with no exceptions or extensions mentioned"],"plain_english_summary":"This AD mandates installation of an approved ice-detection system on specified Mitsubishi MU-2B serial-numbered aeroplanes and requires amendment of the flight manual. Until installation, a cockpit placard forbidding flight into known or forecast icing must be displayed. It affects owners/operators of the listed MU-2B models and aims to prevent undetected airframe icing and loss of control. Installation deadline was 31 December 1995 (historical directive)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-53-amdt-1-ice-detector-system-installation","history":"/api/acts/ad-mu-2-53-amdt-1-ice-detector-system-installation/history","analysis":"/api/acts/ad-mu-2-53-amdt-1-ice-detector-system-installation/analysis","conflicts":"/api/acts/ad-mu-2-53-amdt-1-ice-detector-system-installation/conflicts","importantCases":"/api/acts/ad-mu-2-53-amdt-1-ice-detector-system-installation/important-cases","documents":"/api/acts/ad-mu-2-53-amdt-1-ice-detector-system-installation/documents"}}