{"id":"F2006B09318","name":"AD/EC 135/4 - Air Conditioning System","slug":"ad-ec-135-4-air-conditioning-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53454,"registerId":"commonwealth-F2006B09318-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.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/EC 135/4 Air Conditioning System 10/2","sectionType":"part","heading":"AD/EC 135/4 Air Conditioning System 10/2000 TX","content":"# AD/EC 135/4 Air Conditioning System 10/2000 TX\n\nApplicability: All Model EC135 helicopters, Serial Number (S/N) 0005 up to an including S/N 0169, equipped with air conditioning systems, excluding S/N 0030, 0076, 0093, 0098,\n\n0102, 0104, 0106, 0108, 0110, 0111, 0113, 0114, 0116, 0117, 0119, 0121, 0145,\n\n0146, 0148, 0150, 0152 and 0155.\n\nRequirement: Either:\n\n    Install an insulating mat in the area of the spring resistor located in the airconditioning system pallet (compressor/condenser unit) in accordance with Eurocopter Deutschland Alert Service Bulletin (ASB) EC135-21A-002 Revision 1 date 2 August 2000.\n\nOr\n\n    b. Deactivate the airconditioning system and install a placard on the instrument panel in accordance with ASB EC135-21A-002 Revision 1.\n\nThe placard may be removed and the airconditioning system reactivated when an insulating mat is fitted to the pallet.\n\nNote: LBA AD 2000-270 refers.\n\nCompliance: Within 25 hours time in service from the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 11 August 2000.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in a defined aircraft fleet. It has not expanded beyond its original purpose of correcting the unsafe air conditioning condition."},"complexity_factors":["Single, discrete safety issue (fire risk from spring resistor)","Two clear alternative compliance paths (repair or disable)","Only 23 serial numbers excluded from applicability","No nested definitions or cross-references to other legislation","Single external reference to manufacturer service bulletin","Straightforward compliance deadline (25 hours time in service)"],"plain_english_summary":"This CASA safety order requires owners/operators of certain Eurocopter EC135s (s/n 0005–0169, with listed exclusions) to address a fire risk in the air‑conditioning unit where a spring resistor can overheat. Within 25 flight hours after 11 Aug 2000, either install the insulating mat per Eurocopter SB EC135‑21A‑002 or disable the AC and fit a cockpit warning label. It prevents potential electrical fires and is a legally binding airworthiness directive."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive itself sets a corrective requirement for specified serial numbers and presents two compliance paths; it does not indicate any expansion or contraction of scope from a prior intent within this document. The AD confines obligations to listed EC135 serial numbers (Applicability) and prescribes actions per the Eurocopter ASB (Requirement) to address the unsafe condition."},"complexity_factors":["Narrow technical scope: targets a specific component (air‑conditioning pallet) on a defined helicopter model (Applicability).","Detailed serial-number inclusions/exclusions increase administrative checking but do not add technical complexity (Applicability).","Binary compliance options: modify (install insulating mat) or deactivate + placard (Requirement), simplifying choice architecture.","Mandates compliance with an external service bulletin (Eurocopter ASB EC135-21A-002 Rev 1), so technical execution depends on following that document (Requirement).","Short compliance window (25 hours TIS) creates scheduling/operational pressure (Compliance).","Cross-reference to another airworthiness authority document (LBA AD 2000-270) adds a verification/traceability step (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of certain EC135 helicopters (S/N 0005–0169, with numerous serial-number exclusions) to either fit an insulating mat to the air‑conditioning pallet or deactivate the air‑conditioning system and install a placard, within 25 hours time-in-service. CASA's delegate issued the requirement and operators (owners) must pay for the parts, labour and any downtime; they must follow Eurocopter ASB EC135-21A-002 Revision 1 when performing the modification or placarding."},"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-ec-135-4-air-conditioning-system","history":"/api/acts/ad-ec-135-4-air-conditioning-system/history","analysis":"/api/acts/ad-ec-135-4-air-conditioning-system/analysis","conflicts":"/api/acts/ad-ec-135-4-air-conditioning-system/conflicts","importantCases":"/api/acts/ad-ec-135-4-air-conditioning-system/important-cases","documents":"/api/acts/ad-ec-135-4-air-conditioning-system/documents"}}