{"id":"F2006B09173","name":"AD/DHC-8/18 - Elevator Control Quadrant Lever","slug":"ad-dhc-8-18-elevator-control-quadrant-lever","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52923,"registerId":"commonwealth-F2006B09173-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/18 - Elevator Control Quadrant Lever","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 (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n \n\nAD/DHC-8/18 Elevator Control Quadrant Lever 4/92\n\nApplicability: Model DHC-8 series 100 with serial number 1 through 126 inclusive. Requirement:  In accordance with Boeing Canada de Havilland Division SB A8-27-45 Rev A.\n\nNote: Transport Canada AD CF-88-25 refers.\n\nCompliance: Unless already accomplished; within 50 hours time in service after 2 April 1992. Background:              An elevator control quadrant lever was found to be incorrectly installed on a Dash 8.\n\nThe incorrect installation caused permanent deformation of the associated push rod.\n\nIf not corrected, this condition could result in loss of associated elevator control.\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, targeted safety directive addressing a specific mechanical defect in a defined aircraft population. It has not expanded beyond its original purpose of mandating a specific repair to prevent elevator control failure."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined applicability criterion (serial number range)","Single compliance requirement with clear time limit (50 hours time in service)","No nested exceptions or conditional logic","Only 1 cross-reference (to Transport Canada AD CF-88-25, provided as background only)","Straightforward mechanical directive with no interpretive ambiguity"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It orders owners and operators of certain Bombardier DHC-8 \"Dash 8\" aeroplanes (specifically Series 100 models with serial numbers 1 through 126) to inspect and fix a potentially dangerous defect in the elevator control system.\n\n**The problem:** An elevator control quadrant lever (a mechanical component that helps move the aircraft's tail elevators up and down) was found installed incorrectly on one aircraft. This mistake permanently bent a connected push rod (a metal rod that transfers movement in the control system). If left unfixed, this could cause the pilot to lose control of the elevators — the surfaces that make the plane climb or descend — creating a serious flight safety risk.\n\n**What must be done:** Aircraft operators must follow the repair instructions in Boeing Canada de Havilland Service Bulletin A8-27-45 Rev A. This must be completed within 50 hours of flight time after 2 April 1992, unless already fixed.\n\n**Who it affects:** Operators of early-model DHC-8-100 aircraft (serial numbers 1–126), typically regional airlines and charter operators flying these turboprops in Australia.\n\n**Why it matters:** This is a critical safety fix. Elevator control loss could lead to loss of the aircraft and lives. The directive ensures a known manufacturing or maintenance error is systematically corrected across the affected fleet."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive implements a targeted corrective action for specified airframes per the referenced service bulletin. It does not broaden applicability or add measures beyond inspection and rectification for serial numbers 1–126 as stated in the instrument."},"complexity_factors":["Narrow applicability: only DHC‑8 Series 100, s/n 1–126 (Applicability).","External reference: mandatory compliance is to Boeing Canada de Havilland SB A8‑27‑45 Rev A (Requirement).","Short compliance window: action required within 50 flight‑hours after 2 April 1992 (Compliance).","Single corrective focus: inspection/rectification of elevator control quadrant lever and associated push‑rod (Background).","Operational consequence: potential loss of elevator control increases urgency but does not broaden scope beyond affected serial numbers (Background).","Administrative burden: operators must track affected fleet, schedule inspections, and document compliance per the AD and SB (implied by Requirement/Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier (De Havilland) DHC‑8 Series 100 aeroplanes (serial numbers 1–126) to inspect and, if needed, correct the elevator control quadrant lever installation in accordance with Boeing Canada de Havilland Service Bulletin A8‑27‑45 Rev A. CASA requires compliance within 50 flight‑hours after 2 April 1992 because an incorrectly installed lever can permanently deform the push‑rod and may lead to loss of elevator control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-18-elevator-control-quadrant-lever","history":"/api/acts/ad-dhc-8-18-elevator-control-quadrant-lever/history","analysis":"/api/acts/ad-dhc-8-18-elevator-control-quadrant-lever/analysis","conflicts":"/api/acts/ad-dhc-8-18-elevator-control-quadrant-lever/conflicts","importantCases":"/api/acts/ad-dhc-8-18-elevator-control-quadrant-lever/important-cases","documents":"/api/acts/ad-dhc-8-18-elevator-control-quadrant-lever/documents"}}