{"id":"F2006B06133","name":"AD/PC-6/3 - Air Intake Heating","slug":"ad-pc-6-3-air-intake-heating","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46913,"registerId":"commonwealth-F2006B06133-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/3 - Air Intake Heating","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-6/3 Air Intake Heating 3/66\n\nApplicability: All models with S/Nos. 1 to 556 fitted with Astazou IIE or IIG engines. Document:  Pilatus SB No. 33A.\n\nCompliance: Before 15 April 1966.\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 1966 with a narrow, specific scope (particular aircraft serial numbers and engine types). There is no evidence of scope creep; it remains a targeted technical mandate."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory content","No defined terms section — all references are to external documents (Pilatus SB No. 33A)","No conditional logic or nested exceptions — simple applicability rule (serial numbers + engine types) and single compliance deadline","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance action with fixed date"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Pilatus Porter PC-6 aircraft** (serial numbers 1 through 556) that are powered by **Astazou IIE or IIG engines**.\n\n**What it requires:**\n- Aircraft owners/operators must comply with **Pilatus Service Bulletin No. 33A** — a manufacturer's technical instruction — before **15 April 1966**.\n\n**What it's about:**\n- The directive addresses **air intake heating** systems. These systems prevent ice from forming in the engine's air intake, which could choke the engine and cause power loss or failure — a serious safety risk, especially in cold or moist conditions.\n\n**Who it affects:**\n- Operators of the specified Pilatus Porter aircraft in Australia.\n\n**Why it matters:**\n- This is a **time-critical safety mandate**. Non-compliance means the aircraft cannot legally fly until the modification is made. Airworthiness Directives are legally binding and enforceable — ignoring them risks certificate cancellation, fines, or grounding of the aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD text itself sets its scope: all Pilatus PC-6 aeroplanes with serial numbers 1–556 fitted with Astazou IIE or IIG engines, to be brought into compliance with Pilatus Service Bulletin No. 33A before 15 April 1966. The document contains no language indicating a change from a previous or original scope; the applicability, referenced service bulletin, and compliance date together define the scope as stated."},"complexity_factors":["Narrow applicability: applies only to PC-6 serial numbers 1–556 with Astazou IIE or IIG engines (straightforward identification).","Single, fixed compliance action referenced to one manufacturer's service bulletin (Pilatus SB No. 33A).","Single compliance deadline (before 15 April 1966) reduces procedural complexity but creates scheduling pressure.","No alternative compliance, exemptions, or procedural details are included in the AD text (simplicity of mandate but leaves technical detail to the service bulletin).","Requires technical maintenance work that may need specialist skills and parts (operational complexity resides in the SB, not the AD)."],"plain_english_summary":"This AD, issued by the Civil Aviation Safety Authority, requires Pilatus Porter PC‑6 aircraft (serials 1–556) fitted with Astazou IIE or IIG engines to carry out the air‑intake heating work specified in Pilatus Service Bulletin No. 33A. Owners/operators must complete the SB work by 15 April 1966 at their own expense, creating a fixed safety deadline and maintenance scheduling burden."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-3-air-intake-heating","history":"/api/acts/ad-pc-6-3-air-intake-heating/history","analysis":"/api/acts/ad-pc-6-3-air-intake-heating/analysis","conflicts":"/api/acts/ad-pc-6-3-air-intake-heating/conflicts","importantCases":"/api/acts/ad-pc-6-3-air-intake-heating/important-cases","documents":"/api/acts/ad-pc-6-3-air-intake-heating/documents"}}