{"id":"F2006B07001","name":"AD/SF340/71 - Engine Control Quadrant - Inspection of Flight Idle Stop Solenoid Bracket Screw","slug":"ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48626,"registerId":"commonwealth-F2006B07001-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/71 - Engine Control Quadrant - Inspection of Flight Idle Stop Solenoid Bracket 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/SF340/71 Engine Control Quadrant \\- Inspection of\n\nFlight Idle Stop Solenoid Bracket Screw\n\n  \n9/99\n\nApplicability: Engine Control Quadrants fitted to SAAB Model SF340A aircraft serial numbers 004 through 159 and SAAB Model 340B aircraft, serial numbers 160 through 459.\n\nControl Quadrants with the following part number and reference letters are NOT applicable:\n\nPart Number Reference Letter\n\n53082 F\n\n53162 C\n\n53170 D\n\n53210 A\n\nRequirement: 1. Inspect two screws in the Control Quadrant as specified in SAAB Service Bulletin SAAB 340-76-043 dated 02 July 1999.\n\n2. Replace the Engine Control Quadrant with a serviceable, modified item.\n\nNote: LFV Airworthiness Directive 1-143 dated 02 July 1999 refers.\n\nCompliance: 1. Within 800 flight hours of the effective date of this Directive and thereafter every 800 flight hours (if no fault found).\n\n2. Either, when loose screws are found during the inspection at 1. above, or, within 8000 flight hours, or six years, whichever is the sooner, after the effective date of this Directive.\n\nFitment of a serviceable modified control quadrant is closing action for this Directive. This Airworthiness Directive becomes effective on 9 September 1999.\n\nBackground: An operator has reported a problem with the LH Power Lever binding and not going into reverse after landing. The investigation showed that a screw had backed out of a cam and caused binding within the Control Quadrant. Locking compound had not been applied during installation and it was subsequently discovered that another screw in the assembly was also missing locking compound. Loose screws could cause the power levers to become restricted in movement aft of Flight Idle and the Flight Idle Stop will malfunction.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive targets a specific, reported defect and applies only to stated serial-number ranges while excluding listed part numbers. It prescribes inspection and replacement measures to remedy the identified loose/missing screws without expanding applicability beyond the affected components or aircraft."},"complexity_factors":["Narrow applicability by aircraft serial numbers (SF340A 004–159; 340B 160–459) with explicit part‑number exclusions","Two tiered compliance regime: recurring inspections every 800 flight hours and a separate replacement deadline (8,000 flight hours or six years)","Conditional action triggers: immediate replacement if looseness is found during inspection","Mandated reference to an external document (SAAB Service Bulletin SAAB 340‑76‑043 dated 02 July 1999) for inspection procedure","Fitment of a serviceable modified control quadrant acts as closing action for the Directive","Operational impact concentrated on operators/maintenance organisations who must resource inspections, apply locking compound or replace units"],"plain_english_summary":"Requires operators of SAAB SF340 aeroplanes (specified serial ranges, excluding certain control‑quadrant part numbers) to inspect two screws on the engine control quadrant per SAAB Service Bulletin and, if necessary or by a later deadline, replace the quadrant with a modified serviceable unit. This matters because backed‑out or missing screws can bind power levers and cause the Flight Idle Stop to malfunction. Operators pay for inspections and replacements; compliance is scheduled (every 800 flight hours) and replacement is required within 8,000 flight hours or six years unless a fault is found earlier."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains a narrow, focused scope on a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive (approximately 250 words)","Only 4 defined exclusions (specific part numbers with reference letters)","Simple two-step compliance structure (inspect, then replace)","Clear applicability criteria based on aircraft serial numbers","Single cross-reference to SAAB Service Bulletin 340-76-043 and Swedish LFV Airworthiness Directive 1-143","No nested conditional logic or exceptions to exceptions","Background section provides plain-language explanation of the safety issue"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and, if needed, replacement of two screws in the engine control quadrant on specified SAAB SF340A/B aircraft to prevent throttle lever jamming that can disable reverse thrust. It targets aircraft with affected serial numbers and exempts certain modified quadrants.\n\nOperators must inspect the screws and ultimately fit a modified, serviceable control quadrant to eliminate the risk — a mandatory safety fix to prevent loss of engine power control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw","history":"/api/acts/ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw/history","analysis":"/api/acts/ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw/analysis","conflicts":"/api/acts/ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw/conflicts","importantCases":"/api/acts/ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw/important-cases","documents":"/api/acts/ad-sf340-71-engine-control-quadrant-inspection-of-flight-idle-stop-solenoid-bracket-screw/documents"}}