{"id":"F2006B04469","name":"AD/BELL 206/155 - Low Fuel Level Detector Unit","slug":"ad-bell-206-155-low-fuel-level-detector-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44306,"registerId":"commonwealth-F2006B04469-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\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 CASR 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\n![](image.001.png)  \n\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/BELL 206/155 Low Fuel Level Detector ","sectionType":"part","heading":"AD/BELL 206/155 Low Fuel Level Detector Unit 2/2005","content":"# AD/BELL 206/155 Low Fuel Level Detector Unit 2/2005\n\nDM\n\nApplicability: Model 206L series helicopters equipped with low fuel level detector unit part number (P/N) 206-063-613-003.\n\nRequirement: Unless already accomplished, remove from service low fuel level detector unit P/N 206-063-613-003 with serial numbers 1413, 1414, 1415, 1424, 1428, 1430, 1432 and\n\n1433 as per BHTC Alert Service Bulletin ASB 206L-04-132, Revision A, dated 4 October 2004, or later revisions approved by Transport Canada.\n\nNote: Transport Canada AD CF-2004-24 refers.\n\nCompliance: Before 31 December 2004.\n\nThis Airworthiness Directive becomes effective on 22 December 2004.\n\nBackground: Transport Canada has advised that Bell Helicopter has determined that eight low fuel level detector units, which were sold as spares during the period 19 April 2004 to 26 July 2004, can ‘hang-up’ in the high position and fail to indicate a low fuel condition.\n\nThis Directive mandates the removal of the affected low fuel level detector units.\n\n![Signature: James Coyne](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 14 December 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 22 December 2004.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive stays within the original, narrow safety-fix intent: remove specific suspect spare units that may hang up and give false high fuel readings. It does not broaden to additional parts, models, or corrective measures beyond removal per the manufacturer service bulletin (allowing future revisions approved by Transport Canada for the technical procedure does not expand substantive scope)."},"complexity_factors":["Very short document (single-issue AD).","Narrow applicability: one helicopter model family (206L) and one part number (P/N 206-063-613-003).","Only eight serial numbers listed (1413, 1414, 1415, 1424, 1428, 1430, 1432, 1433).","Simple action mandated (remove from service) with a single compliance deadline.","Cross-references to two external technical sources: BHTC ASB 206L-04-132 Rev A and Transport Canada AD CF-2004-24.","Short compliance window between effective date and deadline increases implementation urgency but not legal complexity.","No nested exceptions, no multiple conditional paths, no defined-terms section."],"plain_english_summary":"**What this directive does (mechanically):**\n\n- Applies to Bell 206L series helicopters fitted with low fuel level detector unit part number (P/N) 206-063-613-003 (Applicability section).\n- Mandates removal from service of eight specific detector units by serial number: 1413, 1414, 1415, 1424, 1428, 1430, 1432 and 1433 (Requirement section).\n- Requires removal to be carried out in accordance with Bell Helicopter Textron Canada (BHTC) Alert Service Bulletin ASB 206L-04-132, Revision A, dated 4 October 2004 (or later revisions approved by Transport Canada) (Requirement section).\n- Sets a compliance deadline of \"before 31 December 2004\" and an effective date of 22 December 2004 (Compliance / Effective date sections).\n\n**Who this affects:**\n\n- Owners and operators of Bell 206L helicopters that have the specified detector unit installed.\n- Maintenance organisations and mechanics who perform inspections and replacements under the BHTC service bulletin.\n\n**Why it matters (official rationale and practical implications):**\n\n- Transport Canada and Bell determined that eight spare low fuel level detector units sold between 19 April 2004 and 26 July 2004 may ‘‘hang-up’’ in the high position and therefore fail to indicate a low-fuel condition (Background section). The directive’s stated purpose is to remove those specific suspect units to correct that unsafe condition.\n\n**Who pays, who decides, and what changes in behaviour:**\n\n- Owners/operators pay for the work: they must identify affected helicopters or spare parts, remove the listed units, and install serviceable replacements if required. Labour and replacement-part costs fall to them unless covered by a warranty or supplier arrangement.\n- The Civil Aviation Safety Authority (CASA) delegate issues and enforces the directive; the removal must follow the BHTC service bulletin and any later Transport Canada–approved revisions.\n- Behaviour change: operators must inspect equipment records and physical units for the listed serial numbers and remove any matching units from service by the deadline; affected spares cannot be used until the issue is resolved.\n\n**Implementation, costs and trade-offs:**\n\n- Compliance burden is narrowly focused: check parts/serial numbers, remove and replace up to eight specific units (low operational complexity per unit). The main costs are labour and sourcing replacements; if replacements are scarce, helicopters may be grounded until resolved.\n- The AD cross-references a manufacturer service bulletin and a Transport Canada AD (CF-2004-24), so operators must follow those technical instructions and any approved revisions (administrative coordination cost).\n- The compliance window is short (effective 22 December 2004 with compliance before 31 December 2004), which raises logistical pressure on operators and maintenance providers to complete removals quickly.\n- Benefits are concentrated (operators and their passengers, and public safety) while costs are concentrated on owners/operators who purchased or installed the affected spares. The measure does not extend to other part numbers or serial numbers.\n\n**Risk, uncertainty and implementation issues:**\n\n- Verification risk: accurate parts records and physical checks are needed to identify affected units.\n- Replacement availability: if many operators hold only a few serviceable detector units or replacements are back-ordered, there is a short-term risk of aircraft being unserviceable.\n- The directive allows for later revisions of the BHTC service bulletin if approved by Transport Canada, which creates a small avenue for changes to the technical procedure but not to the removal requirement itself.\n\n**Bottom line:**\n\nThis is a narrowly targeted safety mandate requiring owners/operators of Bell 206L helicopters to remove eight clearly identified low fuel level detector units (specific P/N and serial numbers) because they may falsely indicate sufficient fuel. The action is procedural (remove/replace according to the manufacturer's service bulletin), imposes direct costs on affected owners/operators, and has a short compliance window that increases logistical pressure."},"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 is a targeted safety directive addressing a specific manufacturing defect in a specific batch of components. The scope remains precisely limited to the identified unsafe condition and the eight affected serial numbers."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term (P/N for part number)","Single, unambiguous requirement with clear applicability criteria","No nested conditions or cross-references to other legislation beyond a single reference to a Canadian Transport Canada directive","Specific serial numbers listed explicitly rather than using ranges or formulae","Single compliance deadline with no exceptions or alternative methods"],"plain_english_summary":"This CASA safety order requires owners/operators of Bell 206L helicopters in Australia to remove eight specific defective fuel level detector units (P/N 206-063-613-003) that can falsely stick in the “high” position and fail to warn of low fuel. Affected helicopters must have the units removed by 31 December 2004 following BHTC Alert Service Bulletin 206L-04-132, Revision A; it protects pilots and passengers from fuel-starvation risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-155-low-fuel-level-detector-unit","history":"/api/acts/ad-bell-206-155-low-fuel-level-detector-unit/history","analysis":"/api/acts/ad-bell-206-155-low-fuel-level-detector-unit/analysis","conflicts":"/api/acts/ad-bell-206-155-low-fuel-level-detector-unit/conflicts","importantCases":"/api/acts/ad-bell-206-155-low-fuel-level-detector-unit/important-cases","documents":"/api/acts/ad-bell-206-155-low-fuel-level-detector-unit/documents"}}