{"id":"F2006B03560","name":"AD/BAL/21 - Liquid Fire & Pilot Light Valve Stem Replacement","slug":"ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43127,"registerId":"commonwealth-F2006B03560-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.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.","sortOrder":0},{"sectionNumber":"AD/BAL/21 Liquid Fire & Pilot Light Valv","sectionType":"part","heading":"AD/BAL/21 Liquid Fire & Pilot Light Valve Stem Replacement 8/2000","content":"# AD/BAL/21 Liquid Fire & Pilot Light Valve Stem Replacement 8/2000\n\nApplicability: Cameron Balloons Ltd (Sky Balloons) Mk 1 and Mk 2 (Mistral) burner.\n\nRequirement: Replace the valve stems in the main blast liquid fire and pilot light valves in accordance with Cameron Balloons Ltd. Service bulletin SB10 Issue A dated 12/5/2000.\n\nNote: UK CAA AD 003-05-2000 refers.\n\nCompliance: Unless already accomplished, within 20 flight hours or 12 months time in service from the effective date of this Directive, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 10 August 2000.\n\nBackground: Failure of the stem/seat pinned joint will cause a leak from the underside of the burner unit. This Directive is raised to prevent a serious external fuel leak occurring.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 30 June 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD is narrowly focused on correcting a single identified unsafe condition (risk of external fuel leak caused by stem/seat pinned joint failure) on a specific burner model by mandating a specific replacement in accordance with the manufacturer’s service bulletin. The measure does not broaden the subject matter beyond replacing the valve stems or add ancillary regulatory obligations, so it has not materially changed scope beyond its original safety-fix purpose."},"complexity_factors":["Short, single-action AD: one mandatory technical action (valve stem replacement).","Minimal conditional logic: compliance deadline is the earlier of 20 flight hours or 12 months.","One external cross-reference: Cameron Balloons Service Bulletin SB10 Issue A (12/5/2000).","One regulatory authority reference: issued under subregulation 39.1(1) of CAR 1998.","No defined-terms section, no multiple exceptions, no staggered phases or reporting requirements."],"plain_english_summary":"**What this instrument does**\n\n- This is an Airworthiness Directive (AD) that requires a specific mechanical repair: replacing the valve stems in two fuel valves (the main “blast” liquid fire valve and the pilot light valve) on certain balloon burners.\n\n- It applies to Cameron Balloons Ltd (Sky Balloons) Mk 1 and Mk 2 (Mistral) burner units. (Applicability)\n\n- The replacement must be done following the manufacturer’s instructions in Cameron Balloons Ltd Service Bulletin SB10 Issue A dated 12/5/2000. (Requirement)\n\n- The work must be completed within 20 flight hours or within 12 months from the AD’s effective date, whichever comes first, unless it has already been done. (Compliance)\n\n- The AD was issued because a failure of the stem/seat pinned joint can cause an external fuel leak from the underside of the burner unit; the stated purpose is to prevent a serious external fuel leak. (Background)\n\n\nWho is affected and who decides\n\n- Affected parties: owners and operators of balloons using Cameron Sky Balloons Mk 1 and Mk 2 (Mistral) burners. They are required to have the valve stems replaced. (Applicability; Requirement)\n\n- Who decides/issued it: a delegate of the Civil Aviation Safety Authority (CASA) issued the AD under subregulation 39.1(1) of the Civil Aviation Regulations 1998. That delegate prescribes the mandatory action and compliance timing. (Introductory material)\n\n\nHow it works mechanically (what operators must do)\n\n- Obtain and follow Cameron Balloons Ltd Service Bulletin SB10 Issue A dated 12/5/2000.\n- Replace the valve stems in both the main blast liquid fire valve and the pilot light valve on each affected burner.\n- Complete the replacement within 20 flight hours or 12 months from the AD’s effective date, unless already completed. (Requirement; Compliance)\n\n\nCosts, incentives and trade-offs (practical effects)\n\n- Direct cost: owners/operators pay for parts and labour to replace the valve stems. The AD does not specify funding or compensation. (Requirement)\n\n- Downtime/opportunity cost: each affected burner/aircraft will be out of service while the replacement is performed; how long depends on workshop availability and the time the Service Bulletin estimates. (Compliance; Requirement)\n\n- Implementation risk: the AD mandates following the manufacturer’s Service Bulletin (SB10). If parts or qualified maintenance providers are scarce, compliance can be delayed, which raises both safety risk and commercial disruption. (Requirement)\n\n- Who can do the work: the AD requires compliance with the Service Bulletin but does not restrict who may carry out the work; in practice, appropriately certificated maintenance organisations will be needed to meet regulatory maintenance standards. This leaves room for independent maintenance providers to perform the work provided they follow the SB and regulatory maintenance standards. (Requirement)\n\n- Competition and prices: the measure imposes a small, non-discriminatory maintenance cost on affected operators. If parts are limited or service capacity constrained, maintenance prices could rise temporarily for affected operators. (Requirement; Compliance)\n\n\nCompliance and enforcement\n\n- Compliance is mandatory under the AD. The AD sets a specific deadline (20 flight hours or 12 months). Non-compliance is a regulatory breach and may expose an operator to enforcement action under the Civil Aviation Regulations. (Compliance; Introductory material)\n\n- The AD references a UK CAA AD (UK CAA AD 003-05-2000). That cross-reference indicates the same unsafe condition was identified by the UK regulator and that the manufacturer-issued Service Bulletin implements the corrective action. (Note)\n\n\nConcentrated benefits and diffuse costs\n\n- Concentrated benefit: operators of affected burners gain a reduced risk of fuel leaks on those specific burners. The safety improvement is concentrated on those aircraft and their operators/passengers.\n\n- Diffuse cost: the replacement cost and downtime are borne by the set of affected operators; the cost per operator is modest but non-zero. (Requirement; Compliance)\n\n\nSummary statement of behavioural change\n\n- Operators must arrange and pay for the specified valve-stem replacements on affected burners within the stated timeframe, using the procedures in the manufacturer’s Service Bulletin. The CASA delegate made compliance compulsory by issuing the AD. (Applicability; Requirement; Compliance)\n\n\nSources cited in this summary: Applicability; Requirement (Cameron Balloons SB10 Issue A); Compliance; Background; Note referencing UK CAA AD."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific mechanical defect in specific balloon burner models. There is no evidence of scope creep; it targets exactly the unsafe condition described in the background."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability criteria (specific balloon burner models)","Single, unambiguous requirement with clear reference to external technical document (Service Bulletin SB10)","Simple compliance deadline (20 flight hours OR 12 months, whichever first)","No nested exceptions, conditional logic, or cross-references to other legislation beyond a single note referencing a UK equivalent directive","Plain language background explaining the safety risk"],"plain_english_summary":"CASA orders owners/operators of Cameron Balloons Ltd Mk 1 and Mk 2 (Mistral) burners to replace defective valve stems (main blast and pilot valves) per the manufacturer’s Service Bulletin SB10 Issue A (12 May 2000). The fix must be done within 20 flight hours or 12 months from 10 Aug 2000, unless already completed. This prevents fuel leaks that could cause fire or explosion, protecting passengers and crew."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement","history":"/api/acts/ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement/history","analysis":"/api/acts/ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement/analysis","conflicts":"/api/acts/ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement/conflicts","importantCases":"/api/acts/ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement/important-cases","documents":"/api/acts/ad-bal-21-liquid-fire-pilot-light-valve-stem-replacement/documents"}}