{"id":"F2006B05395","name":"AD/PA-18/5 - Throttle Levers - Modification","slug":"ad-pa-18-5-throttle-levers-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46021,"registerId":"commonwealth-F2006B05395-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-18/5 - Throttle 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)  Piper PA-18 and 19 (Super Cub) Series Aeroplanes\n\n \n\nAD/PA-18/5 Throttle Levers - Modification 11/60\n\nApplicability: All models.\n\n \n\nRequirement: Rework the throttle as shown below. Compliance:  Forthwith.\n\n![](image.002.png)  \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, single-purpose safety directive focused specifically on throttle lever modification for two aircraft models. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implicitly referenced (the aircraft models)","No cross-references to other legislation or regulations","Single, unambiguous requirement with immediate compliance deadline","Visual diagram referenced but not described in text (creates minor ambiguity for text-only readers)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of Piper PA-18 and PA-19 \"Super Cub\" aeroplanes to modify their throttle levers immediately (\"forthwith\"). The directive references a diagram showing exactly how the throttle must be reworked.\n\n**Who it affects:** Anyone who owns, operates, or maintains Piper PA-18 or PA-19 series aircraft in Australia.\n\n**Why it matters:** Throttle lever defects can cause engine control failures — potentially leading to loss of power or uncontrolled acceleration. This AD mandates a specific mechanical fix to prevent accidents. The \"forthwith\" compliance means operators must act immediately rather than waiting for a scheduled maintenance window."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The supplied AD text sets a clear, broad scope (\"Applicability: All models\") and an immediate requirement to rework the throttle. The excerpt includes no indication that the scope has changed from the directive's original stated applicability or intent; it does not describe any modification in applicability or staged expansion/restriction of the affected fleet."},"complexity_factors":["Brevity of the directive: single-line requirement with illustration rather than detailed procedural steps","Immediate compliance deadline (\"Forthwith\") that leaves no scheduled timeline","Applicability to \"All models\" of the type without model-specific guidance","Reliance on an illustration that must be interpreted by maintenance certifiers","Absence of stated acceptable methods of compliance or supply/parts guidance","Lack of explicit statement of the underlying airworthiness hazard in the supplied text","Potential variability in how maintenance organisations implement the rework due to limited procedural detail"],"plain_english_summary":"This AD mandates an immediate physical rework of the throttle levers on all Piper PA‑18 and PA‑19 (Super Cub) aeroplanes. Owners/operators must arrange and pay for parts, labour and downtime; maintenance organisations and certifying engineers must interpret the AD’s illustration to perform and certify the work. Issued under Part 39, the directive implies a safety concern but gives no explicit hazard, procedures, alternatives or phased compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-18-5-throttle-levers-modification","history":"/api/acts/ad-pa-18-5-throttle-levers-modification/history","analysis":"/api/acts/ad-pa-18-5-throttle-levers-modification/analysis","conflicts":"/api/acts/ad-pa-18-5-throttle-levers-modification/conflicts","importantCases":"/api/acts/ad-pa-18-5-throttle-levers-modification/important-cases","documents":"/api/acts/ad-pa-18-5-throttle-levers-modification/documents"}}