{"id":"F2006B09506","name":"AD/EMB-120/19 Amdt 1 - Ice Detector System","slug":"ad-emb-120-19-amdt-1-ice-detector-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54061,"registerId":"commonwealth-F2006B09506-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-120/19 Amdt 1 - Ice Detector System","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)  \nEmbraer EMB-120 (Brasilia) Series Aeroplanes\n\nAD/EMB-120/19\n\nAmdt 1\n\n  \nIce Detector System 5/98\n\nApplicability: EMB 120 Brasilia aeroplanes serial numbers 120003 through 120339 inclusive.\n\nRequirement: Install an ice detector system in accordance with Embraer Service Bulletin 120-30-0027 Revision 2 dated 3 December 1997.\n\nNote 1: DAC (Brazil) AD 97-06-03R1 Amdt 39-821 refers.\n\nNote 2: Incorporation of an ice detector system in accordance with previous issues of SB 120-30-0027 does not constitute compliance with this airworthiness directive.\n\nNote 3: Revision 22 to the approved flight manual (AFM 120/1017) is complimentary to this airworthiness directive.\n\nCompliance: Prior to 1 September 1998.\n\nThis amendment becomes effective on 23 April 1998.\n\nBackground: The Brazilian Departmento de Aviação Civil (DAC) has determined that a potential hazard (performance degradation) exists during unexpected icing encounters if the anti icing is not activated, due to either pilot unawareness or misjudgement, or if the icing conditions are so severe that the operation falls outside the certification limits. Severe icing is conducive to the formation of an ice build-up on protected surfaces which exceed the capability of the anti-ice system. Installation of an ice detection system is intended to ensure that aircrew is warned of significant ice accretion in time to take appropriate action before the formation of ice results in reduced controllability of the aeroplane.\n\nThis amendment introduces a revision to the service bulletin and extends the compliance time by three months.\n\nThe original issue of this airworthiness directive became effective on 6 November 1997.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of requiring ice detector installation on specific Embraer aircraft. The only changes are: (1) updating to a revised technical standard (Service Bulletin Revision 2), and (2) extending the compliance deadline by three months. The fundamental purpose—improving ice detection safety on these aircraft—remains unchanged."},"complexity_factors":["Single, specific technical requirement with clear applicability (serial number range)","Only one substantive compliance obligation (install system per specific service bulletin revision)","Minimal cross-referencing (one service bulletin, one foreign airworthiness directive, one flight manual revision)","No nested exceptions or conditional logic","Short document (approximately 250 words)","Only 2 defined terms implicitly used (applicability and compliance dates are explicit rather than defined terms)"],"plain_english_summary":"This safety order requires operators of Embraer EMB-120 Brasilia aircraft (serials 120003–120339) to install an ice detection system per Embraer Service Bulletin 120-30-0027 Revision 2 and update the flight manual, with work completed by 1 September 1998. It affects airlines and maintenance crews and matters because early ice detection gives pilots timely warning to prevent dangerous ice accumulation and potential loss of control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment revises the required service bulletin and extends the compliance time by three months relative to the original directive (text: \"This amendment introduces a revision to the service bulletin and extends the compliance time by three months\"). The core mandate—mandatory installation of an ice detector for serial numbers 120003–120339—remains, but the implementation timeline and the specified SB revision were changed."},"complexity_factors":["Narrow, explicit applicability to serial numbers 120003–120339 (Applicability).","Mandated technical action: install ice detector per Embraer SB 120‑30‑0027 Revision 2 (Requirement).","Previous service bulletin revisions are explicitly not acceptable (Note 2), creating a strict compliance standard.","Fixed compliance deadline and an amendment that extends the deadline by three months (Compliance; \"This amendment introduces...extends the compliance time by three months\").","Complementary flight manual revision required (Note 3), imposing documentation update work in addition to hardware retrofit.","Cross-reference to Brazilian authority AD (DAC AD 97‑06‑03R1) adds an international regulatory linkage (Note 1)."],"plain_english_summary":"This airworthiness directive requires operators of Embraer EMB-120 Brasilia aircraft (serial numbers 120003–120339) to install an ice detector system in accordance with Embraer Service Bulletin 120‑30‑0027 Revision 2 and update the flight manual. Compliance had to be completed by 1 September 1998 and the amendment took effect on 23 April 1998.\n\nOperators pay for the retrofit and associated downtime; the Civil Aviation Safety Authority enforces compliance. The stated safety aim is to warn crews of significant ice accretion so they can act before aircraft performance is degraded."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-120-19-amdt-1-ice-detector-system","history":"/api/acts/ad-emb-120-19-amdt-1-ice-detector-system/history","analysis":"/api/acts/ad-emb-120-19-amdt-1-ice-detector-system/analysis","conflicts":"/api/acts/ad-emb-120-19-amdt-1-ice-detector-system/conflicts","importantCases":"/api/acts/ad-emb-120-19-amdt-1-ice-detector-system/important-cases","documents":"/api/acts/ad-emb-120-19-amdt-1-ice-detector-system/documents"}}