{"id":"F2006B08627","name":"AD/CL-600/7 - Horizontal Stabiliser Pitch Trim Actuator - Modification","slug":"ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51605,"registerId":"commonwealth-F2006B08627-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/7 - Horizontal Stabiliser Pitch Trim Actuator - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n \n\n# AD/CL-600/7 Horizontal Stabiliser Pitch Trim Actuator - Modification\n\nApplicability: Pitch trim actuators as listed in requirement document. Document: Canadair Challenger Alert SB No. A600-0084.\n\nNote: Canadian Dept. of Transport AD CF-82-05 refers.\n\n \n\nCompliance: Before issue of Australian Certificate of Airworthiness.\n\n# 3/83\n\n \n\nBackground: Pitch trim actuators are suspected of having possible loose motor drive gear pinions.\n\nThis could result in damage to internal control wiring.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive addressing a specific mechanical defect in a specific aircraft component. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (the requirement document)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement with clear deadline","No conditional logic, exceptions, or alternative compliance methods","Straightforward applicability test (specific aircraft series and component)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft.\n\n**What it does:**\nRequires a specific modification to the **horizontal stabiliser pitch trim actuators** on Bombardier (Canadair) CL-600 Challenger series aircraft.\n\n**The safety problem:**\nThe pitch trim actuators (the mechanical devices that adjust the angle of the horizontal tail to control the aircraft's pitch) may have **loose motor drive gear pinions**. If these come loose, they could damage internal control wiring, potentially leading to loss of pitch control.\n\n**Who must comply:**\n- Owners/operators of CL-600 series aircraft with the affected actuators\n- Must be done **before** the aircraft can receive an Australian Certificate of Airworthiness (meaning new registrations or transfers into Australia)\n\n**Why it matters:**\nPitch control is fundamental to flight safety. A failure here could cause loss of control. This AD ensures the defect is fixed before the aircraft operates in Australian airspace.\n\n**Key reference:**\nThe modification follows Canadair's Alert Service Bulletin A600-0084, and aligns with a Canadian Transport Department directive (CF-82-05)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with its stated purpose in the text: it targets the pitch trim actuators listed in the referenced service bulletin and requires their modification before an Australian Certificate of Airworthiness is issued to address suspected loose motor drive gear pinions (as described in the Background). The instrument does not broaden or narrow that stated target within the text provided."},"complexity_factors":["Single mandatory action with clear timing (must be done before Australian Certificate of Airworthiness) increases simplicity (\"Compliance: Before issue of Australian Certificate of Airworthiness\").","Reliance on an external technical document (Canadair Challenger Alert SB No. A600-0084) shifts technical detail outside the AD, adding a moderate implementation step (\"Document: Canadair Challenger Alert SB No. A600-0084\").","Reference to a foreign AD (Canadian Dept. of Transport AD CF-82-05) requires cross-checking other regulatory material (\"Note: Canadian Dept. of Transport AD CF-82-05 refers\").","Applicability is limited to actuators listed in the requirement document, so determining whether a specific aircraft is affected depends on that list (\"Applicability: Pitch trim actuators as listed in requirement document\").","Technical nature of the underlying fault (loose motor drive gear pinions and potential wiring damage) means qualified maintenance action is required, which can require specialist labour and parts (\"Pitch trim actuators are suspected of having possible loose motor drive gear pinions. This could result in damage to internal control wiring.\")."],"plain_english_summary":"This AD mandates modification (per Canadair Alert SB A600‑0084) of specified horizontal stabiliser pitch‑trim actuators on Bombardier CL‑600 Challengers before issuance of an Australian Certificate of Airworthiness. It targets suspected loose motor‑drive gear pinions that could damage internal control wiring. Aircraft owners/applicants (or their maintenance providers) must obtain and carry out the SB work at their cost; the AD cross‑references Canadian AD CF‑82‑05."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification","history":"/api/acts/ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification/history","analysis":"/api/acts/ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification/analysis","conflicts":"/api/acts/ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification/conflicts","importantCases":"/api/acts/ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification/important-cases","documents":"/api/acts/ad-cl-600-7-horizontal-stabiliser-pitch-trim-actuator-modification/documents"}}