{"id":"F2006B11172","name":"AD/LJ60/4 - Spoiler Actuator","slug":"ad-lj60-4-spoiler-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56870,"registerId":"commonwealth-F2006B11172-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\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 CASR 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\n![](image.001.png)  \n\nLearjet 60 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/LJ60/4 Spoiler Actuator 4/2004","sectionType":"part","heading":"AD/LJ60/4 Spoiler Actuator 4/2004","content":"# AD/LJ60/4 Spoiler Actuator 4/2004\n\nApplicability: Model 60 aeroplanes, serial numbers 60-029, 60-050, 60-120 through 60-139 inclusive.\n\nRequirement: Determine by visual inspection the serial number of the installed spoiler actuators and if the serial number is listed in Learjet Service Bulletin Service Bulletin (S/B) 60-27- 21, dated 14 December 1998 replace the spoiler actuator in accordance with Learjet Service Bulletin S/B 60-27-21.\n\nNote: FAA AD 99-23-19 Amdt 39-11415 refers.\n\nCompliance: Unless previously accomplished before further flight.\n\nThis Airworthiness Directive becomes effective on 15 April 2004.\n\nBackground: Failure of a spoiler actuator has occurred which could result in the spoiler panel floating and inducing an uncommanded roll of the aeroplane.\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 5 March 2004\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific mechanical failure mode in a limited fleet of aircraft. The scope remains precisely limited to the identified unsafe condition and affected aircraft serial numbers, with no expansion beyond the original safety purpose."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined elements: applicability (specific serial numbers), requirement (visual inspection and conditional replacement), and compliance (immediate)","Single condition: if serial number appears in referenced service bulletin, replace; if not, no action required","No nested exceptions or conditional logic beyond the basic if/then structure","One external reference to FAA AD and one to Learjet Service Bulletin, but these are standard aviation references rather than legislative cross-references","No interpretation section, no definitions, no penalty provisions, no review mechanisms"],"plain_english_summary":"This AD orders owners/operators of certain Learjet 60 aircraft (about 21 airplanes) to inspect spoiler actuator serial numbers and replace any units listed in Learjet Service Bulletin 60-27-21.  \n\nIt’s mandatory and effective 15 April 2004; action is required before further flight because prior actuator failure allowed a spoiler to “float,” risking uncommanded roll and serious flight safety consequences."},"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD applies narrowly to specific serial-numbered Learjet 60 aircraft and requires replacement only where the actuator serial number matches the manufacturer service bulletin list. It cross-references FAA AD 99-23-19 but does not broaden applicability or impose additional requirements beyond the service bulletin and the stated requirement."},"complexity_factors":["Narrow applicability: only Model 60 aeroplanes with specific serial numbers (Applicability).","Single, discrete required action: visual inspection of spoiler actuator serial number and replacement if listed (Requirement).","Immediate compliance timing: must be done unless already accomplished before further flight (Compliance).","Dependence on an external manufacturer document for identifying affected parts (Learjet Service Bulletin S/B 60-27-21) (Requirement).","Cross-reference to FAA AD 99-23-19 but no additional procedural detail in the AD (Note).","Issued under delegated authority of CASA under subregulation 39.1(1) of CASR 1998 (preamble)."],"plain_english_summary":"**What it does:** Requires operators of specified Learjet 60 aeroplanes to visually check spoiler actuator serial numbers and replace any actuator listed in Learjet Service Bulletin S/B 60-27-21. (Applicability; Requirement)\n\n**Why it matters:** CASA issued the AD to prevent spoiler actuator failure that can allow a spoiler panel to float and cause an uncommanded roll. Affected aircraft must comply before further flight; operators are responsible for the inspection and any replacement. (Compliance; Background)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-lj60-4-spoiler-actuator","history":"/api/acts/ad-lj60-4-spoiler-actuator/history","analysis":"/api/acts/ad-lj60-4-spoiler-actuator/analysis","conflicts":"/api/acts/ad-lj60-4-spoiler-actuator/conflicts","importantCases":"/api/acts/ad-lj60-4-spoiler-actuator/important-cases","documents":"/api/acts/ad-lj60-4-spoiler-actuator/documents"}}