{"id":"F2006B06130","name":"AD/PC-6/27 - Power Lever Assembly - Inspection and Modification","slug":"ad-pc-6-27-power-lever-assembly-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46907,"registerId":"commonwealth-F2006B06130-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/27 - Power Lever Assembly - Inspection and 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-6/27 Power Lever Assembly - Inspection\n\nand Modification\n\n\n11/68\n\n \n\nApplicability: All models PC-6/B-H2 and PC-6/B1-H2 with S/Nos. prior to 699 except 629, 642, 658 and 666.\n\n \n\nDocument: Pilatus SB No. 85.\n\n \n\nCompliance: Within 10 hours time in service after 28 November 1968.\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":2,"scope_assessment":{"changed":false,"description":"The AD text specifies inspection and modification of the power lever assembly for a defined set of PC‑6 aircraft and delegates technical content to Pilatus SB No. 85 (Applicability; Document; Compliance). There is nothing in the supplied text indicating a change in scope from an earlier or different intention; the instrument’s scope is clear and self‑contained as presented."},"complexity_factors":["Narrow and explicit applicability by model and serial number reduces scope ambiguity (Applicability).","Single, short compliance deadline creates a tight operational timeline (Compliance).","Substantive technical detail is delegated to an external document (Pilatus SB No. 85), so the AD is brief but depends on that bulletin for execution (Document).","The AD text itself contains no step‑by‑step procedures, parts lists, or multiple compliance options, keeping the AD administratively simple but reliant on the SB for complexity."],"plain_english_summary":"This AD mandates inspection and modification of the power‑lever assembly on Pilatus PC‑6/B‑H2 and PC‑6/B1‑H2 aeroplanes with serial numbers before 699 (except 629, 642, 658 and 666), using the technical instructions in Pilatus Service Bulletin No. 85.\n\nWork must be completed within 10 hours time‑in‑service after 28 November 1968; aircraft owners/operators must arrange and fund compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on power lever assembly inspection and modification for a limited aircraft population. It has not expanded beyond its original safety purpose. The scope remains tightly constrained to the specific mechanical issue identified in 1968."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 4 defined elements: applicability (2 models), serial number range, excluded serial numbers, and compliance deadline","Single cross-reference to external technical document (Pilatus SB No. 85)","No nested conditions or exceptions beyond the straightforward serial number exclusions","No interpretative provisions or definitions section","Linear structure: applicability → document reference → compliance requirement"],"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 owners and operators of specific Pilatus Porter PC-6 aircraft to inspect and modify the **power lever assembly** (the cockpit control that manages engine power/throttle). The directive references a manufacturer's Service Bulletin (SB No. 85) which contains the technical details of what needs to be done.\n\n**Who it affects:** \n- **Aircraft models:** PC-6/B-H2 and PC-6/B1-H2\n- **Serial numbers:** All aircraft with serial numbers below 699, **except** serial numbers 629, 642, 658, and 666 (these specific aircraft are excluded from the requirement)\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. If you operate one of these aircraft, you **must** complete this inspection and modification within 10 hours of flight time after 28 November 1968. Non-compliance means the aircraft cannot legally fly — it's a safety issue, likely addressing a potential mechanical defect that could affect flight control or engine management.\n\n**Key deadline:** The work had to be done within 10 flight hours after 28 November 1968 (note: this is a historical directive from 1968, so for current operations, compliance would have been required decades ago)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-27-power-lever-assembly-inspection-and-modification","history":"/api/acts/ad-pc-6-27-power-lever-assembly-inspection-and-modification/history","analysis":"/api/acts/ad-pc-6-27-power-lever-assembly-inspection-and-modification/analysis","conflicts":"/api/acts/ad-pc-6-27-power-lever-assembly-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-pc-6-27-power-lever-assembly-inspection-and-modification/important-cases","documents":"/api/acts/ad-pc-6-27-power-lever-assembly-inspection-and-modification/documents"}}