{"id":"F2006B06117","name":"AD/PC-6/15 - Aileron Cable Pulley - Modification","slug":"ad-pc-6-15-aileron-cable-pulley-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46878,"registerId":"commonwealth-F2006B06117-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/15 - Aileron Cable Pulley - 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)  Pilatus Porter PC-6 Series Aeroplanes\n\n \n\nAD/PC-6/15 Aileron Cable Pulley - Modification 1/67\n\nApplicability: All models prior to S/No. 633. Document: Pilatus SB No. 68.\n\nCompliance: Before 31 March 1967.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1967 with a narrow, specific scope (single aircraft type, single component modification). There is no evidence of scope creep; it remains precisely targeted at its original safety purpose."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only one defined applicability criterion (serial number threshold)","Single compliance action with clear deadline","No nested exceptions, conditional logic, or cross-references to other legislation","Refers to external technical document (Pilatus SB No. 68) for implementation details rather than embedding them"],"plain_english_summary":"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:**\n- Requires owners and operators of **Pilatus Porter PC-6 series aeroplanes** (specifically those built before serial number 633) to modify the **aileron cable pulley** system.\n- An aileron cable pulley is a small wheel that guides the control cables connected to the wing flaps (ailerons) that help steer the aircraft. If this pulley fails, the pilot could lose control of the aircraft's roll.\n\n**Who it affects:**\n- Owners and operators of early-model Pilatus PC-6 aircraft (manufactured before serial number 633).\n\n**Why it matters:**\n- This directive addresses a specific mechanical defect that could compromise flight safety. Compliance was mandatory before 31 March 1967, meaning affected aircraft could not legally fly until the modification was completed.\n\n**How to comply:**\n- Follow the instructions in **Pilatus Service Bulletin No. 68** (the manufacturer's official technical notice detailing the required modification)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The document itself states the applicable models (prior to S/No. 633), the technical reference (Pilatus SB No. 68), and a single compliance date. The text contains no information comparing this AD’s scope to any earlier or later instrument, so there is no indication within this document that the scope has changed from an earlier intent."},"complexity_factors":["Clear, limited scope: single aircraft type and serial-number cutoff (Applicability).","Single, fixed compliance date rather than phased requirements (Compliance).","Reference to an external technical document (Pilatus SB No. 68) which contains the technical detail (Document).","No multiple options, conditional exemptions, or staged inspections in the text—reduces procedural complexity.","Absence of enforcement, cost-allocation, or record-keeping details in the text increases practical uncertainty for implementers."],"plain_english_summary":"This AD mandates a specific aileron cable pulley modification on Pilatus Porter PC‑6 aeroplanes with serial numbers before 633, to be carried out in accordance with Pilatus Service Bulletin No. 68 by 31 March 1967. Owners/operators must arrange and fund the work; it creates a hard compliance deadline with associated scheduling, downtime and cost implications."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-15-aileron-cable-pulley-modification","history":"/api/acts/ad-pc-6-15-aileron-cable-pulley-modification/history","analysis":"/api/acts/ad-pc-6-15-aileron-cable-pulley-modification/analysis","conflicts":"/api/acts/ad-pc-6-15-aileron-cable-pulley-modification/conflicts","importantCases":"/api/acts/ad-pc-6-15-aileron-cable-pulley-modification/important-cases","documents":"/api/acts/ad-pc-6-15-aileron-cable-pulley-modification/documents"}}