{"id":"F2006B07614","name":"AD/Y12/1 - Electrical Cable Chafing","slug":"ad-y12-1-electrical-cable-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50320,"registerId":"commonwealth-F2006B07614-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/Y12/1 Electrical Cable Chafing 1/2003","sectionType":"part","heading":"AD/Y12/1 Electrical Cable Chafing 1/2003","content":"# AD/Y12/1 Electrical Cable Chafing 1/2003\n\nApplicability: Y12 I or Y12 II aeroplanes, with product numbers 03 to 92 inclusive.\n\nRequirement: 1. If not previously accomplished, inspect electrical wires D1-50, D2-50, L7-5.0 and L8-5.0 for chaffing and/or damage in accordance with Harbin Aircraft Manufacturing Corporation Service Bulletin (SB) Y12-24-0058 dated 29 August 1995.\n\n    2. If any chaffing and/or damage is detected during the Requirement 1 inspection, repair and protect the wiring in accordance with SB Y12-24-0058.\n\n    3. If not previously accomplished, install crimp terminals part numbers HB6-91- 18Ag, HB6-91-25Ag and HB6-91-33Ag on wires connecting to the generator and starter-generator switching contactor in accordance with SB Y12-24-0058.\n\nNote: China CAAC AD CAD95-Y012-04 Amdt 39-1475 refers.\n\nCompliance: For Requirement 1 \\- Before 30 April 2003.\n\nFor Requirement 2 \\- Before further flight after accomplishing the Requirement 1 inspection.\n\nFor Requirement 3 \\- At the next aeroplane overhaul (overhaul interval is either 4000 hours time in service or 5000 cycles whiche ver occurs first).\n\nThis Airworthiness Directive becomes effective on 23 January 2003.\n\nBackground: This Directive introduces an inspection to check certain electrical cables that are prone to chafing and/or damage. Additionally, the installation of terminal crimps is required for wires connected to both generators and starter- generator contactors.\n\n![Signature of James Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJames Coyne\n\n![](image.001.png)Delegate of the Civil Aviation Safety Authority 21 November 2002","sortOrder":1}],"analysis":{"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 is a standard, targeted airworthiness directive addressing a specific safety issue (electrical cable chafing) in a specific aircraft type. The scope remains tightly focused on the original safety concern without expansion into unrelated areas."},"complexity_factors":["Very short document (approximately 300 words)","Only 4 defined wire identifiers (D1-50, D2-50, L7-5.0, L8-5.0) and 3 part numbers","Single cross-reference to one manufacturer's service bulletin (SB Y12-24-0058)","Simple conditional structure: if not done → do it; if found → fix it","No nested exceptions or complex definitional sections","Clear, sequential compliance deadlines"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Harbin Y12 I and Y12 II aircraft (serials 03–92) to inspect specific electrical wiring for chafing or damage, repair any defects before flight, and fit improved crimp terminals at the next major maintenance. It addresses risk of electrical failure, fire or loss of systems; compliance is legally required to keep the aircraft airworthy."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD is narrowly focused on identifying and fixing electrical cable chafing on a defined set of Harbin Y12 aeroplanes. It requires an inspection, repair if defects are found, and installation of specified crimp terminals at overhaul. Those measures align with the stated purpose (correcting the unsafe condition) and do not broaden the instrument’s scope beyond that original safety objective. The directive also references an existing CAAC AD and the manufacturer Service Bulletin for procedures, but does not add additional regulatory obligations outside the safety fix described."},"complexity_factors":["Short instrument with 3 substantive requirements (Requirement 1, 2, 3)","Single applicability clause limited to Y12 I/II product numbers 03–92","Clear, short compliance deadlines (one calendar date, one ‘‘before further flight’’, one at next overhaul)","Procedure and repair details delegated to an external document (Harbin SB Y12-24-0058), creating a reliance on another source","Specific part numbers listed for crimp terminals (HB6-91-18Ag, HB6-91-25Ag, HB6-91-33Ag)","Minor cross-reference to China CAAC AD (Note)","No nested exceptions or complex conditional logic beyond ‘‘if damage found, repair’’"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Applies to Harbin Y12 I and Y12 II aeroplanes with product numbers 03 to 92 inclusive (Applicability).\n- Requires three actions:  \n  - Inspect specific electrical wires (D1-50, D2-50, L7-5.0 and L8-5.0) for chafing or other damage, following the manufacturer's Service Bulletin (Requirement 1).  \n  - If chafing or damage is found, repair and protect the wiring according to the same Service Bulletin (Requirement 2).  \n  - Install specified crimp terminals (part numbers HB6-91-18Ag, HB6-91-25Ag and HB6-91-33Ag) on the wires that connect to the generator and starter-generator switching contactor, in accordance with the Service Bulletin (Requirement 3).\n- Sets time limits for compliance:  \n  - The inspection (Requirement 1) must be completed before 30 April 2003.  \n  - Any required repairs (Requirement 2) must be done before further flight after the inspection.  \n  - The crimp terminal installation (Requirement 3) must be done at the next aeroplane overhaul (overhaul interval defined as 4,000 hours time-in-service or 5,000 cycles, whichever occurs first) (Compliance).\n- The directive is legally enforceable under the Civil Aviation Regulations power cited in the instrument (background and signature block).\n\n**Who this affects**\n\n- Aircraft owners and operators of Harbin Y12 I and Y12 II aeroplanes with product numbers 03–92. They must schedule and pay for the inspection, any repairs found, and the terminal installation at overhaul.  \n- Maintenance organisations and licensed engineers who will carry out the inspection, repairs and terminal installations according to the manufacturer’s Service Bulletin.\n\n**Why it matters (official rationale and practical effect)**\n\n- Officially, the directive is to detect and correct electrical cable chafing and related damage that could compromise generator/starter-generator circuitry and aircraft safety (Background). Mechanically, it forces an inspection and, where needed, immediate repair and later a hardware change (crimp terminals) to reduce recurrence.\n\n**Costs, incentives and trade-offs**\n\n- Who pays: aircraft owners/operators incur inspection labour, parts and repair costs, and the opportunity cost of aircraft downtime for inspection/repair or for the terminal installation at overhaul (Requirement sections + Compliance).  \n- Benefit concentration: the safety improvement primarily benefits operators and their passengers (concentrated beneficiaries). Costs are concentrated on owners of the affected models.  \n- Compliance timing creates incentives: the before-30-Apr-2003 deadline for inspection can cause short-term demand for maintenance services; the ‘‘before further flight’’ rule for repairs creates an immediate grounding incentive until faults are fixed (Compliance).  \n- Substitution effects: operators may bring forward overhauls or schedule additional maintenance visits to combine tasks, which affects maintenance workloads and costs.  \n- Implementation risk: the directive refers to a manufacturer Service Bulletin for inspection and repair procedures; successful compliance depends on availability of the specified crimp terminals, local maintenance capability to follow the SB, and accurate identification of the listed wire runs (Requirement, Note).  \n- Enforcement and discretion: the AD is mandatory under CAR subregulation 39.1(1) (signature and legal authority). CASA (through its delegate) sets the requirement; operators have limited discretion other than timing within the stated compliance windows and adherence to the SB.\n\n**Operational effects on private enterprise and markets**\n\n- Maintenance providers will receive concentrated work from affected operators over the inspection window, temporarily increasing demand for their services.  \n- Parts suppliers that stock the named crimp terminals may see increased demand; if parts are scarce that could increase lead times and costs.  \n- The AD does not change ownership, competition rules, or contract freedom directly; it imposes a compliance cost and operational constraint on a specific set of aircraft.\n\n**Risks of unintended consequences**\n\n- If parts or qualified labour are constrained, operators might be grounded longer than planned, imposing additional operational and economic costs.  \n- If the SB procedures are ambiguous or require specialised skills not locally available, there is implementation risk that could delay compliance.\n\n**Source claims vs. observable mechanics**\n\n- The AD states its purpose is to correct an unsafe condition (Background). The observable mechanics show: mandated inspection within a fixed deadline, mandatory repair before flight if defects are found, and mandatory hardware modification at overhaul — all enforceable requirements that transfer inspection/repair costs to owners/operators while aiming to reduce electrical chafing risk.\n\n(References: Applicability; Requirements 1–3; Compliance; Background.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-y12-1-electrical-cable-chafing","history":"/api/acts/ad-y12-1-electrical-cable-chafing/history","analysis":"/api/acts/ad-y12-1-electrical-cable-chafing/analysis","conflicts":"/api/acts/ad-y12-1-electrical-cable-chafing/conflicts","importantCases":"/api/acts/ad-y12-1-electrical-cable-chafing/important-cases","documents":"/api/acts/ad-y12-1-electrical-cable-chafing/documents"}}