{"id":"F2006B07615","name":"AD/Y12/10 - Flap Motoreducer","slug":"ad-y12-10-flap-motoreducer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50323,"registerId":"commonwealth-F2006B07615-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/Y12/10 Flap Motoreducer 3/2003","sectionType":"part","heading":"AD/Y12/10 Flap Motoreducer 3/2003","content":"# AD/Y12/10 Flap Motoreducer 3/2003\n\nApplicability: Y12 aeroplanes listed in Harbin Aircraft Manufacturing Corporation Service Bulletin (SB) Y12-27-0035 dated 3 August 1992.\n\nRequirement: If not previously accomplished, modify the flap motoreducer and its installation in accordance with SB Y12-27-0035.\n\nThis modification should be incorporated in conjunction with the modification to the central control pedestal, SB Y12-76-0036 and AD/Y12/9 refers.\n\nNote: China CAAC AD CAD92-Y012-03 Amdt 39-0810 refers.\n\nCompliance: Before 30 June 2003.\n\nThis Airworthiness Directive becomes effective on 20 March 2003.\n\nBackground: This Directive requires the installation of a new, safer and more reliable flap motoreducer 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 3 February 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 26 February 2003.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope aligns with the stated intent: it applies only to Y12 aircraft listed in SB Y12-27-0035 and requires the specific motoreducer and associated pedestal modifications. The AD references the CAAC AD and another AD but does not expand applicability beyond the SB-listed aircraft."},"complexity_factors":["Applicability is defined by an external manufacturer Service Bulletin list, so affected fleet size must be determined from SB Y12-27-0035 (Applicability).","Mandated technical modification to the flap motoreducer and its installation requires parts, qualified maintenance time and aircraft downtime (Requirement; Background).","Requirement must be incorporated in conjunction with a separate pedestal modification and cross-references another AD, creating coordination and sequencing needs (Requirement; Note).","Fixed compliance deadline (30 June 2003) creates scheduling and logistical pressure for owners/operators (Compliance).","Regulatory alignment with a China CAAC AD is noted, implying international conformity considerations (Note).","Enforcement and timing are set by the CASA delegate, reflecting administrative discretion in issuing the AD (signature/effective date)."],"plain_english_summary":"Requires operators of Harbin Y12 aeroplanes listed in SB Y12-27-0035 to modify the flap motoreducer and its installation per that service bulletin, to be done together with the central control pedestal change in SB Y12-76-0036. Compliance is required by 30 June 2003; the AD is effective 20 March 2003. Aircraft owners/operators must fund and arrange the modification; CASA (the delegate) enforces the requirement. The change alters equipment, maintenance tasks and costs for affected aircraft."},"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 AD maintains its original narrow scope — a specific safety modification to a specific aircraft component on a specific aircraft type. There is no evidence of scope creep; it addresses exactly what the background states: installing a safer flap motoreducer system."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined references (Service Bulletin Y12-27-0035 and Y12-76-0036)","Single straightforward requirement with one condition ('if not previously accomplished')","No nested exceptions or conditional logic","Clear, fixed compliance date with no alternative methods","Minimal cross-referencing (only 2 related documents mentioned in notes)"],"plain_english_summary":"This mandatory AD requires owners/operators and their maintenance organisations to replace the flap motoreducer on specified Harbin Y12 aeroplanes with an improved unit (per Service Bulletin Y12-27-0035), in conjunction with the central control pedestal modification. It took effect 20 March 2003 and must be complied with by 30 June 2003. The upgrade prevents flap failure that could cause loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-y12-10-flap-motoreducer","history":"/api/acts/ad-y12-10-flap-motoreducer/history","analysis":"/api/acts/ad-y12-10-flap-motoreducer/analysis","conflicts":"/api/acts/ad-y12-10-flap-motoreducer/conflicts","importantCases":"/api/acts/ad-y12-10-flap-motoreducer/important-cases","documents":"/api/acts/ad-y12-10-flap-motoreducer/documents"}}