{"id":"F2006B08580","name":"AD/CL-600/20 - ADG Output Harness Chafing","slug":"ad-cl-600-20-adg-output-harness-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51421,"registerId":"commonwealth-F2006B08580-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/20 - ADG Output Harness Chafing","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/20 ADG Output Harness Chafing 8/91\n\nDM\n\nApplicability: All CL-600 aircraft as specified in the Requirement Documents.\n\nRequirement: 1. Action in accordance with Part A of Canadair Service Bulletin A600-0612 or A601-0370 as applicable.\n\n2. Action in accordance with Part B of Canadair Service Bulletin A600-0612 or A601-0370 as applicable.\n\nCompliance: For Requirement 1. Within 25 hours time in service after 13 June1991. For Requirement 2. Within 600 hours time in service after 13 June 1991.\n\nBackground: Three instances of the ADG electrical output harness being chafed through whilst in the stowed position have been reported. When deployed, the chafed wires short circuited to structure, and resulted in the ADG being unable to provide electrical power to the essential bus when required. Damage to the output harness and its supporting structure also resulted.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating inspection and repair of ADG harness chafing on CL-600 aircraft."},"complexity_factors":["Very short document (under 200 words)","Only 2 substantive requirements with clear timeframes","Minimal defined terms (only standard aviation abbreviations like ADG and TIS)","No nested exceptions or conditional logic","Simple cross-reference structure (points directly to manufacturer service bulletins without complex integration)","Binary applicability (all CL-600 series aircraft — no complex exclusions or sub-categories)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of **Bombardier CL-600 Challenger series aircraft** to inspect and fix a dangerous wiring problem. The **Air Driven Generator (ADG)** — a backup power source that kicks in during emergencies — has an electrical cable that can rub against the aircraft structure (\"chafing\") when stowed. This wear can expose wires, causing short circuits when the ADG deploys, leaving the aircraft without critical backup power.\n\n**Who must act:**\nAnyone operating CL-600 series aircraft (including CL-601 and related models covered by the referenced service bulletins).\n\n**What must be done:**\n- **First check (Requirement 1):** Inspect and address the wiring issue within **25 flight hours** after 13 June 1991\n- **Full fix (Requirement 2):** Complete permanent repairs or modifications within **600 flight hours** after 13 June 1991\n\nBoth actions must follow specific manufacturer instructions in **Canadair Service Bulletin A600-0612** or **A601-0370** (depending on aircraft model).\n\n**Why it matters:**\nThree aircraft had already experienced this failure. Without this fix, pilots could lose essential electrical power during an emergency when they need it most — a potentially catastrophic situation during flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text does not indicate any alteration of the original stated goal: it requires the actions set out in the named Canadair service bulletins for applicable CL-600 aeroplanes, with two specified compliance deadlines, to address reported chafing of the ADG output harness that led to ADG failure and structural damage (Applicability; Requirement; Compliance; Background). There is no indication in the provided text that the scope of affected aircraft or required actions has been broadened or narrowed from that stated purpose."},"complexity_factors":["References and cross-reliance on external manufacturer documents (Canadair Service Bulletin A600-0612 or A601-0370) rather than full technical steps in the AD (Requirement).","Two separate compliance time windows (25 hours and 600 hours after 13 June 1991) that create different scheduling pressures (Compliance).","Applicability is defined by the Requirement Documents rather than an explicit serial-number list, requiring operators to check the service bulletin applicability statements (Applicability; Requirement).","Technical nature of the work (electrical harness inspection/repair of the ADG) requires certified maintenance resources and creates operational downtime (Requirement; Background).","Limited factual record in the AD (three reported incidents) requires operators to rely on manufacturer detail to determine precise remedial steps (Background; Requirement)."],"plain_english_summary":"This airworthiness directive requires operators of certain Bombardier CL‑600 (Challenger) aeroplanes to perform the maintenance actions specified in two Canadair service bulletins to inspect/repair the ADG electrical output harness. It was issued after chafing and shorting incidents that disabled the ADG. Owners/operators must fund and schedule the mandated work within the short (25‑hour) and medium (600‑hour) compliance windows to avoid loss of essential electrical power."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-20-adg-output-harness-chafing","history":"/api/acts/ad-cl-600-20-adg-output-harness-chafing/history","analysis":"/api/acts/ad-cl-600-20-adg-output-harness-chafing/analysis","conflicts":"/api/acts/ad-cl-600-20-adg-output-harness-chafing/conflicts","importantCases":"/api/acts/ad-cl-600-20-adg-output-harness-chafing/important-cases","documents":"/api/acts/ad-cl-600-20-adg-output-harness-chafing/documents"}}