{"id":"F2006B06831","name":"AD/SD3-30/3 - Engine Power Levers - Modification","slug":"ad-sd3-30-3-engine-power-levers-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114695,"registerId":"commonwealth-F2006B06831-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/3 - Engine Power Levers - Modification","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/SD3-30/3 Engine Power Levers - Modification 11/81\n\nApplicability: Model SD3-30 with S/Nos. SH3002 to SH3068. Document:  Shorts SB No. SD3-76-01.\n\nCompliance: Before 1 April 1982.\n\n \n\nBackground: Modification of the engine power lever cam mechanism will inhibit take-off with the flight control locks still engaged.\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\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-bound safety directive for a specific aircraft type. It has not expanded beyond its original narrow purpose of mandating a single mechanical modification to prevent an unsafe take-off condition."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 defined elements: specific aircraft model, serial number range, reference document, and compliance date","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement with no exceptions or conditional logic","No nested definitions or interpretive provisions","Straightforward command structure: applicability → document reference → deadline → background explanation"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for a specific type of aircraft: the **Short SD3-30 Series** (a small regional turboprop plane, also known as the Short 330).\n\n**What it requires:**\n- **Who must comply:** Owners or operators of SD3-30 aircraft with serial numbers SH3002 through SH3068\n- **What must be done:** Modify the engine power lever cam mechanism according to Shorts Service Bulletin SD3-76-01\n- **Deadline:** Before 1 April 1982\n\n**Why it matters:**\nThe modification prevents a dangerous situation where a pilot could attempt **take-off while the flight control locks are still engaged**. Flight control locks are devices that physically secure the aircraft's control surfaces (like ailerons, elevators, and rudder) when the plane is parked to prevent wind damage. If a pilot tried to take off with these locks still in place, they would have no control over the aircraft—a potentially catastrophic scenario. This directive forces a mechanical fix that makes it physically impossible to advance the throttles for take-off unless the locks are removed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD imposes a narrowly targeted, new mechanical modification requirement for a specified set of aircraft. The source text sets the applicability, the required action (per the referenced service bulletin), and a firm compliance date. The document does not indicate any expansion or contraction of scope beyond those stated requirements."},"complexity_factors":["Narrow applicability limited to Model SD3-30 with S/Ns SH3002–SH3068 (Applicability)","Single, specific technical action required (modify engine power lever cam mechanism) (Background)","Fixed compliance deadline (before 1 April 1982) creates scheduling pressure but no ongoing regulatory complexity (Compliance)","Compliance method is delegated to an external service bulletin (Shorts SB No. SD3-76-01) which requires technical execution by maintenance providers (Document)","Little procedural detail in the text about exemptions, verification, or alternative means of compliance increases reliance on the service bulletin and enforcement practice (Compliance; Document)"],"plain_english_summary":"Owners and operators of Short SD3‑30 aeroplanes (S/N SH3002–SH3068) must, before 1 April 1982, have the engine power lever cam mechanism modified per Shorts Service Bulletin SD3‑76‑01 so the aircraft cannot commence take‑off while flight control locks are engaged.\n\nCosts are borne by the operators and qualified maintenance organisations must perform the work; the modification restores regulatory compliance and prevents an unsafe take‑off configuration."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-3-engine-power-levers-modification","history":"/api/acts/ad-sd3-30-3-engine-power-levers-modification/history","analysis":"/api/acts/ad-sd3-30-3-engine-power-levers-modification/analysis","conflicts":"/api/acts/ad-sd3-30-3-engine-power-levers-modification/conflicts","importantCases":"/api/acts/ad-sd3-30-3-engine-power-levers-modification/important-cases","documents":"/api/acts/ad-sd3-30-3-engine-power-levers-modification/documents"}}