{"id":"F2006B08601","name":"AD/CL-600/4 - Auxiliary Power Unit Load Control Valve - Special Check and Adjustment","slug":"ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51497,"registerId":"commonwealth-F2006B08601-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/4 - Auxiliary Power Unit Load Control Valve - Special Check and Adjustment","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-600/4  Auxiliary Power Unit Load Control Valve - Special Check and Adjustment\n\nApplicability: All models S/Nos. 1005 to 1008, 1010 to 1050, 1057 and 1058. Document:  Canadair Challenger SB No. 600-0228.\n\nCompliance: Prior to the issue of an Australian Certificate of Airworthiness.\n\n# 3/83\n\n \n\nBackground: A clearance check is required between the APU load control and the APU enclosure front panel. Interference between these components could cause sufficient local erosion to invalidate the fire containment capability of the APU enclosure.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1216},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains tightly scoped to the specific technical issue of APU load control valve clearance on identified Challenger aircraft models. There is no evidence of expansion beyond the original fire containment safety purpose."},"complexity_factors":["Single, discrete mechanical check required (clearance measurement)","Narrow applicability limited to specific aircraft serial numbers only","No defined terms, exceptions, or nested conditional logic","Straightforward compliance trigger (prior to Certificate of Airworthiness issuance)"],"plain_english_summary":"This directive mandates a **safety inspection** for specific Bombardier Challenger 600 series aircraft (serial numbers 1005–1008, 1010–1050, 1057, and 1058).\n\n**What it requires:**\nBefore an Australian Certificate of Airworthiness can be issued for these planes, operators must perform a \"clearance check\" between the Auxiliary Power Unit (APU) load control valve and the APU enclosure front panel.\n\n**Why it matters:**\nIf these parts rub together (interfere), they could wear down (erode) the fire containment barrier. This could allow a fire in the APU compartment to spread to other parts of the aircraft. The check ensures adequate spacing between components to maintain fire safety standards and protect passengers and crew."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment","history":"/api/acts/ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment/history","analysis":"/api/acts/ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment/analysis","conflicts":"/api/acts/ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment/conflicts","importantCases":"/api/acts/ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment/important-cases","documents":"/api/acts/ad-cl-600-4-auxiliary-power-unit-load-control-valve-special-check-and-adjustment/documents"}}