{"id":"F2006B09322","name":"AD/EC 135/8 - FADEC Fail Warning Light","slug":"ad-ec-135-8-fadec-fail-warning-light","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53470,"registerId":"commonwealth-F2006B09322-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS 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 issues the following Airworthiness Directive (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\nEurocopter EC 135 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/EC 135/8 FADEC Fail Warning Light 12/","sectionType":"part","heading":"AD/EC 135/8 FADEC Fail Warning Light 12/2002","content":"# AD/EC 135/8 FADEC Fail Warning Light 12/2002\n\nTX\n\nApplicability: All Model EC 135 T1 helicopters.\n\nRequirement: Amend the Aircraft Flight Manual (AFM) by inserting the appropriate pages enclosed as Appendices 1 through 4 to Eurocopter Alert Service Bulletin EC135-71A-024 dated 6 August 2002.\n\nNote: LBA AD 2002-333 refers.\n\nCompliance: Before further flight after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 27 September 2002.\n\nBackground: The German Luftfahrt-Bundesamt has received reports of a FADEC FAIL caution indicatio n being displayed on EC 135 T1 helicopters. This was caused by a discrepancy in the parameters which were generated within the fuel main metering unit and transmitted to the FADEC. This discrepancy can lead, on appearance of the FADEC FAIL caution indication, to ‘freezing’ of the fuel main metering valve at its momentary position, resulting in loss of the automatic engine control in the affected system. Despite measures undertaken by Turbomeca for elimination of the problem (software improvements TU19C, TU23C and TU45C), a few further FADEC FAIL cases have occurred on EC 135 T1 helicopters, for which no explanation has yet been found and by which a discrepancy in parameters at the cause cannot be ruled out.\n\nThis Airworthiness Directive introduce an AFM amendment which provides a synchronisation procedure for pilots, which has been used in the past, which prevents the parameter discrepancy arising and thus sustains the automatic engine control.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 26 September 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 27 September 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive maintains the original, narrow scope: it targets EC135 T1 helicopters only and prescribes an AFM amendment containing a pilot synchronisation procedure to address FADEC parameter discrepancies (see Applicability, Requirement, Background). It does not expand to other models or mandate hardware replacement; compliance is required before further flight and the effective date is 27 September 2002 (Compliance, effective date)."},"complexity_factors":["Narrow applicability: applies only to \"All Model EC 135 T1 helicopters\" (Applicability).","Single, concrete action: amendment of the Aircraft Flight Manual by inserting Appendices 1–4 from Eurocopter Alert Service Bulletin EC135-71A-024 (Requirement).","Immediate compliance deadline: \"Before further flight after the effective date of this Directive\" (Compliance).","Technical cause and operational risk: FADEC FAIL caution from parameter discrepancies that can 'freeze' the fuel main metering valve and result in loss of automatic engine control (Background).","Operational mitigation relies on a pilot synchronisation procedure inserted into the AFM rather than hardware modification (Background/Requirement).","Dependence on manufacturer documents and prior Turbomeca software measures (TU19C, TU23C, TU45C) noted in the Background.","Regulatory cross-reference to the German LBA AD 2002-333 (Note).","Implementation burden limited to administrative AFM update and crew procedure change; no wide maintenance or modification program mandated in the text (Requirement/Compliance)."],"plain_english_summary":"**This Directive requires operators of Eurocopter EC135 T1 helicopters to insert specified pages from Eurocopter Alert Service Bulletin EC135-71A-024 into the Aircraft Flight Manual and to follow a pilot synchronisation procedure.** It responds to reports of a FADEC FAIL caution caused by parameter discrepancies that can freeze the fuel main metering valve and disable automatic engine control; compliance is required before the next flight (effective 27 September 2002)."},"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 Airworthiness Directive maintains its original narrow scope — addressing a specific technical defect in a specific helicopter model through a specific manual amendment. There is no evidence of scope creep; the directive precisely targets the FADEC parameter discrepancy issue described in the background section."},"complexity_factors":["Very short document (approximately 300 words)","Only 4 defined elements: applicability (specific helicopter model), requirement (manual amendment), compliance deadline, and background","Single, unambiguous action required with no exceptions or alternatives","No cross-references to other legislation beyond a single note referencing a German aviation directive","No conditional logic or nested requirements","Straightforward temporal trigger ('before further flight after effective date')"],"plain_english_summary":"This AD requires all Australian operators of Eurocopter EC135 T1 helicopters to insert new pages into the Aircraft Flight Manual (per the manufacturer bulletin) that add a synchronization procedure to prevent a known FADEC failure. Faulty fuel-system data can freeze the fuel valve and disable automatic engine control; the procedural change aims to avoid engine control loss. Compliance is required before next flight after 27 September 2002."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ec-135-8-fadec-fail-warning-light","history":"/api/acts/ad-ec-135-8-fadec-fail-warning-light/history","analysis":"/api/acts/ad-ec-135-8-fadec-fail-warning-light/analysis","conflicts":"/api/acts/ad-ec-135-8-fadec-fail-warning-light/conflicts","importantCases":"/api/acts/ad-ec-135-8-fadec-fail-warning-light/important-cases","documents":"/api/acts/ad-ec-135-8-fadec-fail-warning-light/documents"}}