{"id":"F2006B07616","name":"AD/Y12/2 - Hydraulic Pump Switch Guard","slug":"ad-y12-2-hydraulic-pump-switch-guard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50326,"registerId":"commonwealth-F2006B07616-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\nHarbin Y12 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/Y12/2 Hydraulic Pump Switch Guard 1/2","sectionType":"part","heading":"AD/Y12/2 Hydraulic Pump Switch Guard 1/2003","content":"# AD/Y12/2 Hydraulic Pump Switch Guard 1/2003\n\nApplicability: Y12 I or Y12 II aeroplanes.\n\nRequirement: If not previously accomplished, install a switch guard (safety lock key) to the hydraulic pump switch in accordance with Harbin Aircraft Manufacturing Corporation Service Bulletin (SB) Y12-29-0057 dated 18 May 1995.\n\nNote: China CAAC AD CAD95-Y012-02 Amdt 39-1414 refers.\n\nCompliance: Before 30 April 2003.\n\nThis Airworthiness Directive becomes effective on 23 January 2003.\n\nBackground: This Directive introduces a switch guard on the hydraulic pump switch to prevent the hydraulic pump being inadvertently turned off. Turning off the hydraulic pump will prevent safe operation of the aircraft braking system.\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 22 November 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 18 December 2002.","sortOrder":1}],"analysis":{"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 discrete, targeted safety directive addressing a specific mechanical issue (hydraulic pump switch guarding) on a specific aircraft type. The scope remains precisely limited to its original safety purpose with no expansion beyond the immediate safety fix."},"complexity_factors":["Very short document (approximately 250 words)","Only 2 defined applicability criteria (Y12 I and Y12 II aeroplanes)","Single, unambiguous requirement with one condition ('if not previously accomplished')","No cross-references to other legislation beyond a single note referencing a Chinese aviation authority directive","Clear, fixed compliance date with no conditional timelines or exceptions","No nested definitions or interpretive provisions"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Harbin Y12 I and Y12 II aeroplanes to install a switch guard on the hydraulic pump switch per Service Bulletin Y12-29-0057 (18 May 1995). The guard prevents accidental pump shutoff that could impair braking during landing/taxi. It’s a one‑time modification, effective 23 Jan 2003, to be completed before 30 Apr 2003."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is limited to installing a specified switch guard on Y12 I and Y12 II aeroplanes per the named Harbin service bulletin; it does not expand requirements beyond that modification or to other aircraft types. The AD mirrors the referenced CAAC/Service Bulletin action and does not alter the original technical subject or extend applicability."},"complexity_factors":["Narrow applicability: applies only to Harbin Y12 I and Y12 II aeroplanes (Applicability).","Single mandated action: install a switch guard (safety lock key) to the hydraulic pump switch (Requirement).","Action must follow an external technical document: Harbin Service Bulletin Y12-29-0057 dated 18 May 1995 (Requirement).","Fixed compliance deadline: actions required before 30 April 2003 (Compliance); AD effective 23 January 2003.","Legal basis: issued under subregulation 39.1(1) of CAR 1998 giving the AD legal force (opening paragraph).","Dependence on prior status: obligation applies only 'if not previously accomplished', so operators must verify prior compliance (Requirement).","Safety-critical consequence stated in AD: turning off the hydraulic pump will prevent safe operation of the braking system, creating strong compliance incentive (Background).","Reference to a foreign authority/document: notes China CAAC AD CAD95-Y012-02, which may affect interpretation or provenance of the requirement (Note/Requirement).","Administrative publication: AD notified in the Commonwealth Gazette (notified 18 December 2002), which affects legal notification and recordkeeping."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Harbin Y12 I and Y12 II aeroplanes to install a safety lock (switch guard) on the hydraulic pump switch, following Harbin Service Bulletin Y12-29-0057 (18 May 1995). The directive’s explicit purpose is to prevent inadvertent shutdown of the hydraulic pump—which would disable the aircraft braking system—and it must be done before 30 April 2003 (effective 23 January 2003)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-y12-2-hydraulic-pump-switch-guard","history":"/api/acts/ad-y12-2-hydraulic-pump-switch-guard/history","analysis":"/api/acts/ad-y12-2-hydraulic-pump-switch-guard/analysis","conflicts":"/api/acts/ad-y12-2-hydraulic-pump-switch-guard/conflicts","importantCases":"/api/acts/ad-y12-2-hydraulic-pump-switch-guard/important-cases","documents":"/api/acts/ad-y12-2-hydraulic-pump-switch-guard/documents"}}