{"id":"F2006B06776","name":"AD/SA-TP/27 - Auto-Pilot Emergency Cut Out Control","slug":"ad-sa-tp-27-auto-pilot-emergency-cut-out-control","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114619,"registerId":"commonwealth-F2006B06776-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/27 - Auto-Pilot Emergency Cut Out Control","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)  British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes\n\n \n\nAD/SA-TP/27 Auto-Pilot Emergency Cut Out Control NK\n\nApplicability: All models fitted with Sperry type ALIA or AL3 autopilot. Document: Scottish Aviation Mod. No. C989.\n\nCompliance: Forthwith.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument’s scope is confined to aircraft models fitted with Sperry ALIA or AL3 autopilots and requires implementation of Scottish Aviation Mod. No. C989 forthwith. The text does not expand the class of affected aircraft or the required action beyond that explicit description, so there is no indication in the provided text that the scope has been changed from the directive’s stated content."},"complexity_factors":["Narrow technical scope: applies only to Twin Pioneer aircraft fitted with Sperry ALIA or AL3 autopilots (clear applicability reduces interpretive complexity). (Applicability)","Immediate compliance requirement: \"Forthwith\" imposes scheduling and operational complexity for owners/operators. (Compliance)","Technical implementation dependency: requires a specific modification (Scottish Aviation Mod. No. C989) which likely needs qualified technicians and parts, creating operational and supply-chain complexity. (Document)","Minimal textual detail: the directive does not include procedural steps, acceptance criteria, or alternatives, increasing implementation and interpretation risk.","Regulatory enforcement dimension: mandatory nature under the Civil Aviation Safety Authority adds compliance and administrative complexity despite the short text. (Schedule of Airworthiness Directives)"],"plain_english_summary":"This airworthiness directive (AD/SA-TP/27) mandates that British Aerospace (Scottish Aviation) Twin Pioneer aeroplanes fitted with Sperry ALIA or AL3 autopilots be modified in accordance with Scottish Aviation Mod. No. C989 forthwith. It obliges owners/operators and maintenance organisations to carry out the work immediately, creating near-term costs, downtime and concentrated demand for parts and technicians while enforcing a mandatory safety retrofit."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical deficiency in a specific aircraft type. It has not expanded beyond its original purpose of mandating an autopilot emergency cut-out control."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","Only one defined applicability criterion (Sperry ALIA or AL3 autopilot)","Single compliance requirement with reference to external technical document (Scottish Aviation Mod. C989)","No nested exceptions, conditional logic, or cross-references to other legislation","Standard AD format with minimal procedural detail — all technical implementation deferred to referenced manufacturer document"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive** (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires an immediate safety fix for **British Aerospace (Scottish Aviation) Twin Pioneer aircraft** — specifically those fitted with **Sperry ALIA or AL3 autopilot systems**.\n\n**The problem:** The directive mandates installation of an **emergency cut-out control** for the autopilot. This is a critical safety feature that allows pilots to instantly disengage the autopilot in an emergency (for example, if the system malfunctions or behaves unexpectedly).\n\n**Who must comply:** Anyone operating or maintaining Twin Pioneer aircraft with the specified autopilot models.\n\n**When:** **\"Forthwith\"** — meaning immediately, without delay. This is the most urgent compliance category in aviation safety regulation.\n\n**How to comply:** Follow the technical instructions in **Scottish Aviation Modification No. C989** — the manufacturer's official modification document that specifies exactly how to install the emergency cut-out.\n\n**Why it matters:** Autopilot malfunctions can cause loss of aircraft control. An emergency cut-out gives pilots a fail-safe way to regain manual control instantly. The \"forthwith\" urgency suggests this addresses a serious or potentially catastrophic safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-27-auto-pilot-emergency-cut-out-control","history":"/api/acts/ad-sa-tp-27-auto-pilot-emergency-cut-out-control/history","analysis":"/api/acts/ad-sa-tp-27-auto-pilot-emergency-cut-out-control/analysis","conflicts":"/api/acts/ad-sa-tp-27-auto-pilot-emergency-cut-out-control/conflicts","importantCases":"/api/acts/ad-sa-tp-27-auto-pilot-emergency-cut-out-control/important-cases","documents":"/api/acts/ad-sa-tp-27-auto-pilot-emergency-cut-out-control/documents"}}