{"id":"F2006B06884","name":"AD/SD3-60/39 - LP Levers","slug":"ad-sd3-60-39-lp-levers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114764,"registerId":"commonwealth-F2006B06884-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/39 - LP Levers","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)  Short SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/39 LP Levers 11/93\n\nApplicability: All SD360 aircraft.\n\n \n\nRequirement: Action in accordance with Shorts Service Bulletin SD360-28-20.\n\n \n\nNote: FAA Airworthiness Directive 92-27-17 refers.\n\n \n\nCompliance: Prior to 31 December 1993.\n\n \n\nBackground: This Directive has been issued to require the left and right low pressure (LP) fuel shut-off levers to be locked in the open position. The LP levers are to be locked by using securing wire which can be broken in an emergency.\n\n \n\nThe requirement follows reports of the LP levers being inadvertently selected off when closing the fuel crossfeed valve levers.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose: it applies to all SD360 aircraft and requires the LP shut-off levers to be locked open per the manufacturer Service Bulletin. There is no language in the text extending the requirement beyond that mechanical modification or expanding applicability beyond the specified aircraft (Applicability; Requirement; Background)."},"complexity_factors":["Narrow applicability: applies only to all SD360 aircraft (Applicability)","Single, specific mechanical action required: lock left and right LP fuel shut-off levers open using securing wire (Requirement; Background)","Depends on an external document (Shorts Service Bulletin SD360-28-20) for the exact installation method (Requirement)","Short, fixed compliance deadline (Prior to 31 December 1993) reduces ongoing regulatory complexity (Compliance)","Low technical and regulatory discretion in the directive itself — the action and method are prescribed (Requirement)"],"plain_english_summary":"What this instrument does, mechanically\n\n- Requires the left and right low pressure (LP) fuel shut-off levers on Shorts SD3-60 aircraft to be physically locked in the OPEN position using securing wire that can be broken in an emergency (Requirement; Background).  The locking is to be carried out in accordance with Shorts Service Bulletin SD360-28-20 (Requirement).\n\nWho this affects\n\n- Operators and owners of all SD3-60 (SD360) aircraft (Applicability).\n- Maintenance personnel who must fit the securing wire in line with the manufacturer service bulletin (Requirement).\n- The regulator that issued the directive, which sets the compliance deadline (Compliance).\n\nKey deadlines and references\n\n- The work must be completed prior to 31 December 1993 (Compliance).\n- The action called for is the action set out in Shorts Service Bulletin SD360-28-20 (Requirement).\n- The directive notes a related FAA airworthiness directive (Note).\n\nWhy it was issued (stated reason)\n\n- The directive was issued because there were reports of the LP levers being inadvertently selected OFF when closing the fuel crossfeed valve levers. Locking the LP levers open by securing wire is intended to prevent that inadvertent selection while allowing the wire to be broken if an emergency requires shutting the lever (Background).\n\nPractical implications, costs and incentives (source‑grounded)\n\n- Who pays: Aircraft operators or owners must carry out and pay for the fitting of the securing wire and any associated labour or materials required by the Service Bulletin (Requirement; Applicability).\n- Who decides and enforces: The Civil Aviation Safety Authority (as the issuing authority for the Airworthiness Directive) requires compliance by the deadline and identifies the Service Bulletin as the required method (Schedule header; Requirement; Compliance).\n- Behaviour change: Maintenance/flight crews will have the LP levers mechanically locked open; to place a lever OFF in an emergency the securing wire must be deliberately broken (Background).\n- Compliance burden and implementation risk: The measure is a straightforward mechanical modification directed by a service bulletin; it requires access to each aircraft and time in a maintenance environment and depends on following the Service Bulletin precisely (Requirement). The directive itself does not quantify time, cost or materials.\n\nTrade-offs and operational considerations (source‑grounded analysis)\n\n- The directive trades an extra step and a small fitting cost (securing wire and installation labour) for a mechanical constraint that prevents inadvertent lever movement (Background; Requirement).\n- The securing wire is specified to be breakable in an emergency, so the modification preserves the crew’s ability to move the lever in urgent situations at the cost of destroying the securing wire and then replacing it afterward (Background).\n- The action depends on the contents of the manufacturer’s Service Bulletin; operators must obtain and apply that bulletin to meet the directive (Requirement).\n\nSource citations (sections of the directive used above)\n\n- Applicability: \"All SD360 aircraft.\" (Applicability)\n- Requirement: \"Action in accordance with Shorts Service Bulletin SD360-28-20.\" (Requirement)\n- Compliance: \"Prior to 31 December 1993.\" (Compliance)\n- Background: text describing locking levers with securing wire and reports of inadvertent selection when closing fuel crossfeed valve levers (Background)\n- Note: references FAA AD 92-27-17 (Note).\n"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive addressing a specific mechanical problem (inadvertent fuel lever movement). It has not expanded beyond its original narrow purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 substantive requirement with clear action (lock levers with wire)","Single applicability criterion (all SD360 aircraft)","No defined terms section — uses plain language and one industry abbreviation (LP for low pressure)","No cross-references to other legislation or regulations beyond a single service bulletin reference","Single compliance deadline with no conditional exceptions or alternative methods"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** Requires owners and operators of Short SD3-60 series aeroplanes (also known as Short 360 aircraft) to physically lock the left and right low pressure (LP) fuel shut-off levers in the \"open\" position using safety wire.\n\n**Why it matters:** There had been reports of pilots accidentally turning off these fuel levers when they were actually trying to close the fuel crossfeed valve levers nearby. If the LP fuel shut-off levers are accidentally moved to \"off\" during flight, the engines could be starved of fuel — a potentially catastrophic situation. The safety wire acts as a physical barrier that prevents accidental movement but can be broken quickly in a genuine emergency.\n\n**Who must comply:** Anyone operating Short SD3-60 aircraft in Australia.\n\n**When:** The modification had to be completed before 31 December 1993.\n\n**How to comply:** Follow the instructions in \"Shorts Service Bulletin SD360-28-20\" (the manufacturer's official technical notice). The FAA (American aviation regulator) issued a similar directive (92-27-17), which is noted for reference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-39-lp-levers","history":"/api/acts/ad-sd3-60-39-lp-levers/history","analysis":"/api/acts/ad-sd3-60-39-lp-levers/analysis","conflicts":"/api/acts/ad-sd3-60-39-lp-levers/conflicts","importantCases":"/api/acts/ad-sd3-60-39-lp-levers/important-cases","documents":"/api/acts/ad-sd3-60-39-lp-levers/documents"}}