{"id":"F2006B01844","name":"AD/A119/4 - Hydraulic Pump","slug":"ad-a119-4-hydraulic-pump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41040,"registerId":"commonwealth-F2006B01844-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.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\nAgusta A119 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/A119/4 Hydraulic Pump 5/2002","sectionType":"part","heading":"AD/A119/4 Hydraulic Pump 5/2002","content":"# AD/A119/4 Hydraulic Pump 5/2002\n\nApplicability: All Agusta A119 helicopters equipped with hydraulic pump P/N 109-076-42-101 fitted.\n\nRequirement: 1. In accordance with Agusta Technical Bulletin 119-4.\n\n    Check hydraulic fluid level.\n\n    b. If an excessive consumption of hydraulic fluid is noted with no sign of external leakage perform analysis of the transmission fluid for contamination by hydraulic fluid, prior to further flight.\n\n    c. Contaminated transmissions must be removed prior to further flight as per Technical Bulletin 119-4.\n\n2. In accordance with Agusta Technical Bulletin 119-4.\n\na. Replace hydraulic pump.\n\nNote: Italian AD 2002-113 refers.\n\nCompliance: Requirement 1. At each daily inspection.\n\nRequirement 2. Prior to 31st December 2002.\n\nThis Airworthiness Directive becomes effective on 16 May 2002.\n\nBackground: The current hydraulic pump does not allow hydraulic fluid to drain from the case if the hydraulic pump shaft seal leaks. Subsequently fluid leakage can degrade the main transmission seal and allow hydraulic fluid to enter the transmission. Contamination of the transmission lubricating oil will require main transmission removal.\n\n![](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 7 April 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 April 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD remains narrowly focused on the single technical problem identified: the hydraulic pump design that can lead to hydraulic fluid entering the main transmission. The measures (daily checks, fluid analysis if indicated, removal of contaminated transmissions before flight, and replacement of the pump) are directly tied to that safety concern. There is no expansion beyond that original safety purpose in the text of this AD."},"complexity_factors":["Short, single-page AD with limited sections (Applicability, Requirement, Compliance, Background)","Single defined applicability: Agusta A119 helicopters with pump P/N 109-076-42-101","Two core requirements (daily inspection/contamination handling; pump replacement)","External dependency: mandatory compliance with Agusta Technical Bulletin 119-4 (adds procedural detail outside the AD)","Time-bound compliance: daily inspections and a single calendar deadline (31 December 2002)","One cross-reference to another authority's AD (Italian AD 2002-113)"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Applies to: all Agusta A119 helicopters that have hydraulic pump P/N 109-076-42-101 fitted. (Applicability)\n\n- Daily action required: at each daily inspection, check the hydraulic fluid level and follow the procedures in Agusta Technical Bulletin 119-4. If hydraulic fluid is being consumed excessively without any visible external leak, the transmission fluid must be analysed for contamination by hydraulic fluid before the helicopter flies again. If contamination is found, the contaminated main transmission must be removed before further flight. (Requirement 1; Compliance)\n\n- Replacement action required: replace the hydraulic pump in accordance with Agusta Technical Bulletin 119-4, to be completed no later than 31 December 2002. (Requirement 2; Compliance)\n\n- The AD became effective 16 May 2002. (Effectivity)\n\n- Reason: the existing hydraulic pump design can retain leaked hydraulic fluid in the pump case; that fluid can then migrate and contaminate the main transmission lubricating oil. Contaminated transmission oil can require removal of the main transmission. (Background)\n\n\n**Who must act and who pays**\n\n- Who decides: the Civil Aviation Safety Authority delegate issued the AD; operators and licensed maintenance organisations are required to follow it. (Front matter / signature)\n\n- Who acts: the helicopter operator (or their maintenance provider) must carry out the daily checks, arrange fluid analysis when indicated, remove contaminated transmissions before further flight, and replace the specified pump by the deadline. (Requirement 1–2; Compliance)\n\n- Who pays: operators (or their insurers/owners) bear the direct costs — time for daily inspections, any laboratory analysis of transmission oil, labour and parts to replace pumps, and potential costs of removing and repairing or replacing contaminated main transmissions. Downtime (grounding) while awaiting parts, analysis or repairs is also a cost to operators. (Requirements; Background)\n\n\n**Practical mechanics and compliance risk**\n\n- The AD mandates following Agusta Technical Bulletin 119-4 for the inspection, testing and replacement procedures; the Technical Bulletin contains the procedural detail that the AD requires. (Requirement 1–2)\n\n- The AD sets two compliance timings: the inspection check at every daily inspection; and pump replacement no later than 31 December 2002. Failure to comply exposes operators to regulatory enforcement action and to the operational safety risks the AD is intended to eliminate. (Compliance)\n\n\n**Trade-offs, incentives and implementation issues**\n\n- Incentives and behaviour: operators are incentivised to replace the identified pump promptly to avoid the risk of transmission contamination, which can be costly and time-consuming to remedy. The daily-inspection requirement creates a recurring monitoring cost but reduces the chance of operating with an undetected leak. (Requirement 1–2; Background)\n\n- Costs vs. avoided cost: the immediate, concentrated costs fall on operators (inspection time, analysis fees, pump-parts and replacement labour, potential transmission removal/repair). The avoided cost is the potentially larger expense and downtime of main transmission removal/repair, plus the safety risk of operating with contaminated oil. (Requirement 1–2; Background)\n\n- Supply and downtime risk: the AD depends on availability of replacement pumps and the ability of maintenance providers to perform the replacement per the Technical Bulletin. Shortages or scheduling delays can cause grounded aircraft and additional commercial cost. (Requirement 2)\n\n- Effect on independent maintenance providers: licensed independent maintenance organisations can perform the inspections, oil analysis and pump replacement, but must follow the Technical Bulletin procedures. This creates demand for authorised MRO work but imposes a technical compliance obligation on whoever performs the work. (Requirement 1–2)\n\n\n**References and cross‑documents**\n\n- The AD requires compliance with Agusta Technical Bulletin 119-4 for procedural steps. (Requirement 1–2)\n\n- The AD notes a related Italian AD (2002-113). (Note)\n\n\n**Bottom line (simple)**\n\n- If you operate an Agusta A119 with pump P/N 109-076-42-101, you must check hydraulic fluid every daily inspection, analyse transmission oil if fluid consumption occurs with no external leak, remove any contaminated transmission before flying, and replace the pump by 31 December 2002 — all in accordance with Agusta Technical Bulletin 119-4. The AD aims to prevent hydraulic fluid from entering the main transmission, which can require transmission removal and repair. (Applicability; Requirement 1–2; Background)"},"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 AD maintains its original narrow scope — addressing a specific mechanical defect in a specific helicopter model's hydraulic system. There is no evidence of scope creep; it targets exactly the unsafe condition described in the background."},"complexity_factors":["Very short document (under 400 words)","Only 2 substantive requirements with clear sub-paragraphs (1a, 1b, 1c, 2a)","Single applicability criterion (specific helicopter model + specific part number)","No defined terms section — all language is operational/technical rather than legal","No cross-references to legislation beyond the enabling power (subregulation 39.1(1) of CAR 1998)","Clear compliance deadlines ('at each daily inspection', 'prior to 31st December 2002')","Single external reference (Agusta Technical Bulletin 119-4) incorporated by reference"],"plain_english_summary":"This mandatory CASA Airworthiness Directive affects Agusta A119 helicopters fitted with hydraulic pump P/N 109-076-42-101. It requires daily hydraulic-level checks and testing/removal of the main transmission if unexplained fluid loss indicates contamination, and mandates replacement of the defective pump with a corrected unit by 31 December 2002.  \n\nIt prevents hydraulic leakage from contaminating transmission oil and risking catastrophic gearbox failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a119-4-hydraulic-pump","history":"/api/acts/ad-a119-4-hydraulic-pump/history","analysis":"/api/acts/ad-a119-4-hydraulic-pump/analysis","conflicts":"/api/acts/ad-a119-4-hydraulic-pump/conflicts","importantCases":"/api/acts/ad-a119-4-hydraulic-pump/important-cases","documents":"/api/acts/ad-a119-4-hydraulic-pump/documents"}}