{"id":"F2006B11151","name":"AD/LEARJET/33 - Stall Warning Accelerometer","slug":"ad-learjet-33-stall-warning-accelerometer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56841,"registerId":"commonwealth-F2006B11151-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/33 - Stall Warning Accelerometer","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)  Gates Learjet 24 & 25 Series Aeroplanes\n\n \n\nAD/LEARJET/33 Stall Warning Accelerometer 2/86\n\nApplicability: 24 and 25 series aircraft with S/No’s 24A-011, 24A-012, 24-015, 24-019, 24-031, 24-\n\n043, 24-050, 24-051, 24-055, 24-060, 24-065, 24-087, 24-096, 24-100 to 24-357, 25-\n\n206 to 25-336, 25-338 and on.\n\n \n\nRequirement: Gates Learjet SB 23/24/25-301B.\n\n \n\nNote: FAA AD 82-01-05R2 also refers.\n\n \n\nCompliance: Within 220 hours time in service after 28th February 1986 and thereafter at every 220 hours time in service.\n\n \n\nBackground:  Faulty accelerometers or an improperly wired stall warning system when coupled with an inadvertent stick pusher operation during cruise flight could present control forces and flight upset beyond the capability of the crew to recover.\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, targeted safety directive focused on a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of addressing the stall warning accelerometer issue in identified Learjet models."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined elements: applicability (serial numbers), requirement (reference to SB), and compliance deadline","No nested conditional logic or exceptions","Single cross-reference to FAA AD 82-01-05R2 (informational only)","Straightforward periodic compliance requirement (every 220 hours)","No interpretation section or defined terms glossary"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and correction of the stall‑warning accelerometer wiring on specific Gates Learjet 24/25 serials per Service Bulletin 23/24/25‑301B. Affected operators must comply within 220 flight hours (and repeat every 220 hours) to prevent unintended stick‑pusher activation. The rule is safety‑critical: incorrect sensors or wiring can cause uncommanded control forces and potential loss of control, and noncompliance grounds the aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument itself sets an initial and recurring compliance requirement for specified aircraft and cites the service bulletin and FAA AD. It contains no statement indicating a change to the original scope or intent; the text does not provide any amendment history or scope alteration."},"complexity_factors":["Narrow applicability: specific serial numbers for Learjet 24 & 25 create administrative tracking and record-keeping requirements (Applicability).","Recurring compliance interval: mandatory repeat every 220 hours demands ongoing scheduling into maintenance cycles (Compliance).","Technical remedy: work follows a manufacturer service bulletin addressing accelerometer and wiring issues, requiring specialised inspection/repair skills (Requirement).","Inter-jurisdictional reference: the AD explicitly notes an FAA AD reference, which can require cross-checking between authorities (Note).","Safety-critical interaction: the risk stems from interaction between accelerometer/wiring faults and inadvertent stick‑pusher activation, raising operational risk-management and testing considerations (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Gates Learjet 24 and 25 serial numbers to carry out the work in Gates Learjet Service Bulletin SB 23/24/25-301B to address the stall warning accelerometer and its wiring. Compliance is required within 220 flight hours after 28 February 1986 and must be repeated every 220 hours. The rule is issued because a faulty accelerometer or incorrect wiring plus an inadvertent stick‑pusher could create control forces or an upset beyond the crew’s ability to recover (Requirement; Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-33-stall-warning-accelerometer","history":"/api/acts/ad-learjet-33-stall-warning-accelerometer/history","analysis":"/api/acts/ad-learjet-33-stall-warning-accelerometer/analysis","conflicts":"/api/acts/ad-learjet-33-stall-warning-accelerometer/conflicts","importantCases":"/api/acts/ad-learjet-33-stall-warning-accelerometer/important-cases","documents":"/api/acts/ad-learjet-33-stall-warning-accelerometer/documents"}}