{"id":"F2006B11418","name":"AD/OPTICA/6 - Engine Control Linkage","slug":"ad-optica-6-engine-control-linkage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57333,"registerId":"commonwealth-F2006B11418-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/OPTICA/6 - Engine Control Linkage","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nFLS Aerospace OA7 Optica Series Aeroplanes\n\nAD/OPTICA/6 Engine Control Linkage 8/97\n\nApplicability: All Optica OA7 series aircraft.\n\nRequirement: 1. Inspect the 3/16 inch ball joints in the throttle and mixture linkage, forward and aft ends, for signs of wear in accordance with Paragraph 5 Part A of FLS Aerospace Mandatory SB B2/SB/007 Issue 2 dated 17/10/96.\n\n2. Replace the ball joints in the throttle and mixture linkage in accordance with Paragraph 5 Part B of FLS Aerospace Mandatory SB B2/SB/007 Issue 2 dated 17/10/96.\n\nNote: UK CAA AD 009-10-96 refers.\n\nCompliance: 1. At next 50 hourly inspection after the effective date. Thereafter, reinspect at intervals not exceeding 50 hours time in service until Requirement 2 has been carried out.\n\n2. Unless previously carried out, at next annual inspection. This airworthiness directive becomes effective on 17 July 1997.\n\nBackground: The manufacturer has advised that during maintenance of an overseas aircraft the throttle arm was found to have been drilled oversize to accommodate a ¼ inch ball joint fitting.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive keeps a narrow technical scope: inspections and replacement of throttle/mixture ball joints on Optica OA7 aircraft per the manufacturer's service bulletin. It enforces a manufacturer‑specified corrective action and inspection cadence without expanding obligations beyond that specific safety issue."},"complexity_factors":["Cross-reference to manufacturer Mandatory Service Bulletin B2/SB/007 Issue 2 (requires access to and compliance with external document)","Recurring inspection requirement (every 50 hours) until replacement increases administrative tracking and maintenance labour","Clear technical specification (3/16\" ball joint) and background issue (oversize drilling to 1/4\") require precise parts control","Applicability to all Optica OA7 aircraft creates fleet‑wide compliance obligation","Compliance timing: immediate 50‑hour inspections and a definitive replacement deadline at next annual inspection","Note referencing UK CAA AD may prompt cross‑jurisdictional records or interpretation checks"],"plain_english_summary":"This airworthiness directive requires owners/operators of all FLS Aerospace Optica OA7 aircraft to inspect the 3/16‑inch ball joints in throttle and mixture linkages for wear and to replace them per FLS Mandatory Service Bulletin B2/SB/007 Issue 2. Inspections are at 50‑hour intervals until replacement, and replacement must be done by the next annual inspection. The AD follows a finding of an oversize drilled throttle arm; operators pay for parts, labour and downtime and must follow the manufacturer’s SB and record compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect discovered in a particular aircraft type. It has not expanded beyond its original purpose of ensuring safe engine control linkage in Optica OA7 aircraft."},"complexity_factors":["Single, specific aircraft type (Optica OA7 series) with narrow applicability","Only two mechanical components addressed (throttle and mixture linkage ball joints)","Two clear, sequential requirements (inspect, then replace)","Simple compliance timeline based on standard maintenance intervals (50-hour and annual inspections)","Single external reference to manufacturer's service bulletin (FLS Aerospace SB B2/SB/007)","No defined terms section, no conditional logic, no exceptions or nested provisions","Total length: approximately 200 words"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Optica OA7 aircraft in Australia to inspect throttle and fuel‑mixture control ball joints for wear and replace any worn or incorrectly sized parts. It responds to discovered modifications that can cause in‑flight control or engine power loss. Inspections are due at the next 50‑hour check and every 50 hours until replacement; replacement must be completed by the next annual inspection. Effective 17 July 1997."}},"importantCases":[],"_links":{"self":"/api/acts/ad-optica-6-engine-control-linkage","history":"/api/acts/ad-optica-6-engine-control-linkage/history","analysis":"/api/acts/ad-optica-6-engine-control-linkage/analysis","conflicts":"/api/acts/ad-optica-6-engine-control-linkage/conflicts","importantCases":"/api/acts/ad-optica-6-engine-control-linkage/important-cases","documents":"/api/acts/ad-optica-6-engine-control-linkage/documents"}}