{"id":"F2006B07621","name":"AD/Y12/7 - Reverse Control System","slug":"ad-y12-7-reverse-control-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50341,"registerId":"commonwealth-F2006B07621-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/Y12/7 Reverse Control System 3/2003","sectionType":"part","heading":"AD/Y12/7 Reverse Control System 3/2003","content":"# AD/Y12/7 Reverse Control System 3/2003\n\nApplicability: Y12II aircraft with Serial Numbers (S/N) 21, 22, 27, 33, 34, 36, 37, 42, 43, 46, and\n\n47.\n\nRequirement: Carry out rework of the reverse control system in accordance with HAMC Service Bulletin Y12-76-0030.\n\nNote: China CAAC AD CAD 92-Y12-002 Amdt 39-0736 refers.\n\nCompliance: Unless previously carried out, prior to further flight.\n\nThis Airworthiness Directive becomes effective on 20 March 2003.\n\nBackground: Reworking of the reverse stop is required to prevent inadvertent operation of the control 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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It targets a specific unsafe condition (reverse control system defect) in a small, identified fleet of aircraft (11 serial numbers). There is no evidence of scope creep; the instrument remains tightly focused on the original safety issue identified in the background."},"complexity_factors":["Very short document (under 300 words)","Only 11 specific aircraft affected by serial number","Single, unambiguous requirement: follow manufacturer service bulletin Y12-76-0030","No defined terms section","No cross-references to other legislation beyond basic enabling regulation (CAR 1998 subreg 39.1(1))","Simple compliance trigger: 'prior to further flight' with single exception ('unless previously carried out')","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This AD requires owners/operators of 11 specific Harbin Y12II aircraft to rework the reverse (thrust‑reverser) control system before the next flight to prevent inadvertent in‑flight activation, which could cause sudden braking and loss of control. It takes effect 20 March 2003 and follows HAMC Service Bulletin Y12‑76‑0030 for the repair method."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements a targeted corrective action consistent with its stated purpose to prevent inadvertent reverse control operation. It applies only to listed Y12II serial numbers and mandates the specified rework before further flight, aligning with the original remedial intent and the referenced CAAC AD."},"complexity_factors":["Narrow applicability to a defined set of aircraft by serial number (Applicability).","Single, specific corrective action mandated: rework per HAMC Service Bulletin Y12-76-0030 (Requirement).","Immediate compliance timing: \"prior to further flight\" creates zero-tolerance scheduling pressure (Compliance).","Reference to foreign authority (China CAAC AD CAD 92-Y12-002 Amdt 39-0736) adds cross-jurisdictional provenance but no extra procedural steps (Note).","Low administrative discretion: CASA delegate prescribes action under CAR 1998 subreg 39.1(1), leaving operators to execute the prescribed work."],"plain_english_summary":"This Airworthiness Directive requires operators of certain Harbin Y12II aeroplanes (specific serial numbers) to have the reverse control system reworked in accordance with HAMC Service Bulletin Y12-76-0030. The rework is mandated to prevent inadvertent operation and must be completed before the aircraft’s next flight. The CASA delegate issued the requirement under CAR 1998 subreg 39.1(1); operators must arrange and pay for the corrective work, following the referenced service instructions."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-y12-7-reverse-control-system","history":"/api/acts/ad-y12-7-reverse-control-system/history","analysis":"/api/acts/ad-y12-7-reverse-control-system/analysis","conflicts":"/api/acts/ad-y12-7-reverse-control-system/conflicts","importantCases":"/api/acts/ad-y12-7-reverse-control-system/important-cases","documents":"/api/acts/ad-y12-7-reverse-control-system/documents"}}