{"id":"F2006B06152","name":"AD/PC-6/48 - Horizontal Stabiliser Trim Setting","slug":"ad-pc-6-48-horizontal-stabiliser-trim-setting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46955,"registerId":"commonwealth-F2006B06152-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nPilatus Porter PC-6 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/PC-6/48 Horizontal Stabiliser Trim Se","sectionType":"part","heading":"AD/PC-6/48 Horizontal Stabiliser Trim Setting 8/2002","content":"# AD/PC-6/48 Horizontal Stabiliser Trim Setting 8/2002\n\nDM\n\nApplicability: Model PC-6 aircraft, all Manufacturers Serial Numbers up to and including MSN 939.\n\nRequirement: Placard Installation:\n\n    Install placard Pilatus part number 110.71.06.611 on the heating tube above the instrument panel on the left side of the Stand-By Compass in clear view of the pilot; or,\n\n    b. Fabricate placard in conspicuous colour with the following words, using letters at least ½- inch in height, and install this placard on the heating tube above the instrument panel on the left side of the Stand-By Compass in clear view of the pilot:\n\n“WARNING: SET CORRECT TRIM BEFORE TAKE-OFF”\n\nFlight Manual Revision:\n\n    Insert Pilatus PC-6 Aircraft Flight Manual Temporary Revision TR-TRIM 1, dated 26 August 1999, into Section 2 Operating Procedures of the Aircraft Flight Manual, and,\n    Insert Pilatus PC-6 Aircraft Flight Manual Temporary Revision TR-TRIM 3, dated 14 June 2002 into the Aircraft Flight Manual.\n\nTerminating action\n\nInstallation of the trim warning system mandated by (Pilatus PC-6 Service Bulletin No. 180 Revision 1) constitutes terminating action for the Placard Installation, and Flight Manual Revision paragraph b. of this Directive.\n\nNote: Switzerland FOCA AD HB 2002-314 refers.\n\nCompliance: Before further flight after 3 July 2002, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 3 July 2002.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive sets corrective measures limited to the specified PC‑6 MSN range and prescribes placard/manual-change requirements with an alternative terminating action (Pilatus SB No.180 Rev 1). The text shows no expansion or narrowing of scope beyond those stated applicability and terminating-action provisions."},"complexity_factors":["Narrow applicability: applies only to Pilatus PC‑6 aircraft, MSN up to and including 939 (Applicability).","Immediate compliance deadline: \"before further flight after 3 July 2002\" creates short timeline for operators (Compliance).","Multiple compliance paths: either install a placard/fabricate one and insert Flight Manual TRs, or install the trim warning system as terminating action (Requirement; Terminating action).","Prescriptive placard requirements: specified placard part number, location, wording and minimum letter size (Requirement: Placard Installation).","Administrative burden: insertion of two Temporary Revisions into the Aircraft Flight Manual (Requirement: Flight Manual Revision).","Dependence on manufacturer service bulletin for terminating action: termination tied to Pilatus PC‑6 Service Bulletin No. 180 Revision 1 (Terminating action).","Cross-reference to foreign regulator AD: notes Switzerland FOCA AD HB 2002-314 (Note), which may affect international recordkeeping.","Regulatory authority and enforceability: issued by CASA delegate under CAR 1998 subregulation 39.1(1) (preamble)."],"plain_english_summary":"This Airworthiness Directive requires Pilatus PC‑6 aeroplanes up to Manufacturer Serial Number 939 to display a pilot-visible warning about correct horizontal stabiliser trim and to insert two specified temporary Flight Manual revisions. The placard (or a fabricated equivalent) must be fitted and the manual updates made before further flight after 3 July 2002.\n\nOperators must pay for the placard/manual changes or may instead install the trim‑warning system set out in Pilatus Service Bulletin No. 180 Rev 1 (which ends the placard/manual requirement). CASA enforces compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe trim setting condition in a specific aircraft type. No scope creep detected."},"complexity_factors":["Single, specific aircraft model and serial number range","Only two main compliance paths (placard installation or manual fabrication)","Clear, unambiguous compliance deadline","Simple terminating action clause referencing external service bulletin","No nested definitions, cross-references to other legislation, or conditional logic beyond the basic applicability criteria","Total length under 300 words"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Pilatus Porter PC‑6 aircraft (serials up to MSN 939) to install a cockpit trim‑warning placard and amend the Aircraft Flight Manual with two temporary revisions to ensure correct trim is set before take‑off. Compliance was required before further flight after 3 July 2002 to address an unsafe condition that can cause loss of control. Installing the Pilatus trim‑warning system (SB 180 Rev 1) terminates the placard/AFM actions; an approved or specified operator‑made placard is allowed as an alternative."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-48-horizontal-stabiliser-trim-setting","history":"/api/acts/ad-pc-6-48-horizontal-stabiliser-trim-setting/history","analysis":"/api/acts/ad-pc-6-48-horizontal-stabiliser-trim-setting/analysis","conflicts":"/api/acts/ad-pc-6-48-horizontal-stabiliser-trim-setting/conflicts","importantCases":"/api/acts/ad-pc-6-48-horizontal-stabiliser-trim-setting/important-cases","documents":"/api/acts/ad-pc-6-48-horizontal-stabiliser-trim-setting/documents"}}