{"id":"F2006B06995","name":"AD/SF340/66 - Engine Control Quadrant - Securing of Power Cam Screw","slug":"ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48608,"registerId":"commonwealth-F2006B06995-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/66 - Engine Control Quadrant - Securing of Power Cam Screw","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSAAB SF340 Series Aeroplanes\n\nAD/SF340/66 Engine Control Quadrant \\- Securing\n\nof Power Cam Screw\n\n  \n10/98\n\nApplicability: SAAB Model SF340A serial numbers 004 through 159 and SAAB Model 340B aeroplanes, serial numbers 160 through 439.\n\nRequirement: Secure the control quadrant power cam securing screws in accordance with SAAB Service Bulletin SAAB 340-76-042 dated 28 May 1998.\n\nNote: LFV Airworthiness Directive 1-128 dated 29 May 1998 refers.\n\nCompliance: Within 1200 flight hours or six calendar months, whichever comes first, after the effective date of this Directive.\n\nThis airworthiness directive becomes effective on 10 September 1998.\n\nBackground: One operator has reported two instances of Power Lever (PL) binding. The cause of the binding was that the screws holding the spacer between the two PL cams in the flight idle stop unit were of an incorrect type and therefore not properly secured. The result of this situation is that the screws can back out and interfere with the PL and limit the movement to maximum 80% power or prevent PL movement in the ground power range.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive targets a specific, identified hardware defect and prescribes a corrective maintenance action for defined serial-number ranges. Nothing in the text expands regulatory coverage beyond that targeted fix or adds new regulatory powers; it implements a manufacturer procedure within a set compliance timeframe (Requirement; Background)."},"complexity_factors":["Narrow applicability by specific model and serial-number ranges reduces regulatory breadth.","Technical task is a localized mechanical securing procedure rather than a system redesign.","Reliance on the manufacturer's service bulletin for procedure and parts increases operator dependence on OEM documentation.","Fixed compliance window (1,200 fh or six months) can create scheduling and downtime pressure for operators.","Potential safety consequence if omitted raises enforcement and audit attention from the regulator.","Possible need for specific fasteners, tools or inspection steps introduces modest supply and training considerations.","No new certification pathways or administrative approvals required, limiting procedural complexity."],"plain_english_summary":"Requires operators of Saab SF340A (serials 004–159) and 340B (serials 160–439) to secure the power‑cam spacer screws in the engine control quadrant by following Saab Service Bulletin 340‑76‑042. Mechanically, the action fixes the screws between the two power‑lever cams so they cannot back out and interfere with lever travel. The directive responds to reported instances of power‑lever binding that can limit engine power or prevent ground‑power movement and must be done within 1,200 flight hours or six months (Requirement; Compliance)."},"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 identified in service. It has not expanded beyond its original purpose of mandating a particular hardware fix for a known safety issue."},"complexity_factors":["Single, specific mechanical issue with clear applicability criteria (two aircraft models by serial number range)","Straightforward compliance requirement referencing a single external technical document (manufacturer's service bulletin)","Simple time-based compliance formula (flight hours OR calendar months, whichever first)","No defined terms section, no nested exceptions, no conditional logic","Single background incident driving the directive","Total length: approximately 200 words"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of specified SAAB SF340A (S/N 004–159) and 340B (S/N 160–439) aircraft to secure certain screws in the engine control quadrant per SAAB Service Bulletin 340-76-042. \n\nLoose screws can cause power lever jamming or binding—potentially limiting engine power to 80% or preventing ground-range control—so work must be done within 1,200 flight hours or 6 months after 10 September 1998."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw","history":"/api/acts/ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw/history","analysis":"/api/acts/ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw/analysis","conflicts":"/api/acts/ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw/conflicts","importantCases":"/api/acts/ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw/important-cases","documents":"/api/acts/ad-sf340-66-engine-control-quadrant-securing-of-power-cam-screw/documents"}}