{"id":"F2006B06153","name":"AD/PC-6/49 - Aileron Control System Bellcrank Assembly","slug":"ad-pc-6-49-aileron-control-system-bellcrank-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46957,"registerId":"commonwealth-F2006B06153-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \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\nPilatus Porter PC-6 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/PC-6/49 Aileron Control System Bellcr","sectionType":"part","heading":"AD/PC-6/49 Aileron Control System Bellcrank Assembly 1/2003","content":"# AD/PC-6/49 Aileron Control System Bellcrank Assembly 1/2003\n\nApplicability: Model PC-6 series aircraft, with all Manufacturers Serial Numbers (MSN) up to and including MSN 939.\n\nRequirement: Action in accordance with Pilatus Aircraft Mandatory Service Bulletin No. 27-001, dated 5 June 2002.\n\nNote: Switzerland FOCA AD HB 2002-642 refers.\n\nCompliance: Within 100 hours time in service or 3 months after 23 January 2003, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 23 January 2003.\n\nBackground: The FOCA received a report of an incident of increased friction in the aileron control system of a PC-6 aircaft. Investigation revealed that axial movement in certain aileron bellcrank assemblies can occur in the aileron control system which could result in interference of the control cable attachment bolts with the adjacent structure. The axial movement was found to be caused by deterioration of the bond between the surfaces of the bellcrank bearings and their housings.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 29 November 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 18 December 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements corrective action for an identified unsafe condition reported to FOCA (bond deterioration allowing axial movement in aileron bellcranks) by mandating the Pilatus service bulletin for affected MSNs. It does not broaden applicability or add requirements beyond the manufacturer’s mandatory service bulletin and the stated serial‑number and compliance limits, so the operational scope remains aligned with the original safety fix described in the Background and Requirement."},"complexity_factors":["Narrow applicability limited to PC‑6 aircraft with MSN up to and including 939 (Applicability) — reduces operational scope but requires serial‑number checks.","Mandates actions by reference to an external technical document (Pilatus Mandatory Service Bulletin No. 27‑001) (Requirement) — requires access to and reliance on manufacturer procedures.","Short compliance window (100 hours or 3 months from 23 Jan 2003) (Compliance) — imposes scheduling and potential downtime costs on operators.","Technical diagnosis and repair (axial movement caused by bond deterioration in bellcrank bearings) (Background) — needs qualified maintenance personnel and possible part replacement.","Regulatory enforcement by CASA delegate (AD issued under CAR 1998 subregulation 39.1(1)) — creates a legal obligation rather than a recommendation.","Interoperability with foreign ADs (references Switzerland FOCA AD HB 2002‑642) — may require coordination for operators subject to multiple jurisdictions."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Pilatus PC‑6 aeroplanes (manufacturers’ serial numbers up to and including 939) to carry out the corrective work set out in Pilatus Mandatory Service Bulletin No. 27‑001 to fix axial movement of aileron bellcrank bearings that can lead to control‑cable interference. The CASA delegate set a compliance window of 100 flight hours or 3 months from 23 January 2003; operators must arrange and pay for the inspections/repairs specified in the service bulletin."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific aircraft model and serial number range","One clear requirement referencing an external technical document (service bulletin)","Simple compliance deadline (whichever occurs first of two conditions)","No defined terms section, no cross-references to other legislation beyond the enabling regulation (CAR 1998 subreg 39.1(1))","Straightforward factual background with single causal chain"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Pilatus Porter PC‑6 aeroplanes (serials up to 939) to inspect and repair the aileron control bellcrank bearings per Pilatus Service Bulletin 27‑001 (5 June 2002). Work must be done within 100 flight hours or three months from 23 January 2003. The action prevents bearing deterioration that could cause control cable contact, jamming, or loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-49-aileron-control-system-bellcrank-assembly","history":"/api/acts/ad-pc-6-49-aileron-control-system-bellcrank-assembly/history","analysis":"/api/acts/ad-pc-6-49-aileron-control-system-bellcrank-assembly/analysis","conflicts":"/api/acts/ad-pc-6-49-aileron-control-system-bellcrank-assembly/conflicts","importantCases":"/api/acts/ad-pc-6-49-aileron-control-system-bellcrank-assembly/important-cases","documents":"/api/acts/ad-pc-6-49-aileron-control-system-bellcrank-assembly/documents"}}