{"id":"F2006B06829","name":"AD/SD3-30/28 - LP Levers","slug":"ad-sd3-30-28-lp-levers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114693,"registerId":"commonwealth-F2006B06829-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/28 - 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 SD3-30 Series Aeroplanes\n\n \n\nAD/SD3-30/28 LP Levers 11/93\n\nApplicability: All SD330 aircraft.\n\n \n\nRequirement: Action in accordance with Shorts Service Bulletin SD330-28-35.\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. The 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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive for a specific aircraft model. It has not expanded beyond its original narrow purpose of addressing a specific mechanical/human factors issue with LP fuel levers."},"complexity_factors":["Extremely short document — only 8 substantive lines","Single, unambiguous mechanical requirement (lock levers with wire)","No defined terms section, no cross-references to other legislation","Only one condition (compliance deadline)","No exceptions, exemptions, or nested logic"],"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 a specific aircraft type.\n\n**Who it affects:** Owners and operators of **Short SD3-30 series aircraft** (also known as Short 330). These are twin-turboprop regional airliners.\n\n**What it requires:** Operators must **lock the left and right low pressure (LP) fuel shut-off levers in the open position** using securing wire. This wire is designed to be breakable in an emergency, so pilots can still shut off fuel if needed.\n\n**Why it matters:** There had been reports of pilots **accidentally turning off the fuel supply** when they meant to operate the fuel crossfeed valve levers (which balance fuel between tanks). If the LP levers are knocked off during flight, the engines lose fuel and could shut down — obviously catastrophic. This directive prevents that human error by physically locking the levers open.\n\n**Deadline:** The fix had to be done before **31 December 1993**.\n\n**Key point:** This AD references an overseas safety bulletin (FAA Airworthiness Directive 92-27-17 from the US), showing how Australia often adopts international aviation safety standards."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument's scope as presented remains consistent with its stated intent: it applies to all SD330 aircraft and mandates locking the left and right LP fuel shut-off levers in the open position by following Shorts Service Bulletin SD330-28-35, to be completed by the specified compliance date. No expansion or narrowing of applicability or required action is indicated in the text provided (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability: applies only to one aircraft type (All SD330 aircraft) (Applicability).","Single, discrete mechanical requirement: install securing wire to lock LP levers open (Requirement; Background).","Dependence on an external technical document (Shorts Service Bulletin SD330-28-35) for implementation details (Requirement).","Fixed compliance deadline concentrates workload and creates scheduling pressure (Compliance: prior to 31 December 1993).","Operational considerations: wire must be both secure in service and breakable in emergency, creating a small but non-trivial installation/specification risk (Background).","Cross-reference to FAA Airworthiness Directive adds an inter-jurisdictional compliance context (Note)."],"plain_english_summary":"This instrument requires all Short SD3-30 aeroplanes to have the left and right low‑pressure fuel shut‑off levers locked in the OPEN position using securing wire installed per Shorts Service Bulletin SD330‑28‑35 (compliance by 31 Dec 1993). It affects SD330 owners/operators and their maintenance organisations, prevents inadvertent lever OFF selections when closing crossfeed valves, and imposes installation cost and operational handling changes—wire is breakable in an emergency."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-28-lp-levers","history":"/api/acts/ad-sd3-30-28-lp-levers/history","analysis":"/api/acts/ad-sd3-30-28-lp-levers/analysis","conflicts":"/api/acts/ad-sd3-30-28-lp-levers/conflicts","importantCases":"/api/acts/ad-sd3-30-28-lp-levers/important-cases","documents":"/api/acts/ad-sd3-30-28-lp-levers/documents"}}