{"id":"F2018L01268","name":"AD/STINSON 108/3 Rudder Cables - Inspection/Replacement","slug":"ad-stinson-108-3-rudder-cables-inspection-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":97964,"registerId":"commonwealth-F2018L01268-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Univair Aircraft (Stinson) 108 Series Ae","sectionType":"part","heading":"Univair Aircraft (Stinson) 108 Series Aeroplanes","content":"# Univair Aircraft (Stinson) 108 Series Aeroplanes\n\n| AD/STINSON 108/3 | Rudder Cables - Inspection / Replacement | 18/2018 |\n| ---------------- | ---------------------------------------- | ------- |\n\n| Applicability: | All Univair Aircraft Corporation Stinson 108 series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Remove rudder cables from the pulleys, bend the cables in a tight “U” where the cables pass over the pulley being careful that permanent kinks are not formed, and inspect either visually or by touch for signs of core strand breakage.2. Replace all cables showing any signs of core strand breakage.Note 1: The Requirement 1 inspection may be discontinued upon completion of the pulley modification detailed in Stinson Service Bulletin 266 dated 1 February 1950, as in force at the commencement of this AD.Note 2: FAA AD 50-17-02 and Stinson Service Bulletin 266 dated 1 February 1950 refer. |\n| Compliance:    | 1. Within 25 hours’ time in service after the commencement date of this AD, unless previously accomplished, and thereafter at intervals not to exceed 100 hours’ time in service.2. Before further flight.                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This AD commences on 14 September 2018.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Background:    | A number of cases have been reported of broken core strands in rudder cables where they pass over the pulley at fuselage Station 18.75. This AD is issued to detect and replace rudder cables showing signs of core strand breakage.                                                                                                                                                                                                                                                                                                                                                                             |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n4 September 2018","sortOrder":0},{"sectionNumber":"AD/STINSON 108/3","sectionType":"part","heading":"AD/STINSON 108/3","content":"## AD/STINSON 108/3","sortOrder":1},{"sectionNumber":"Rudder Cables - Inspection / Replacement","sectionType":"part","heading":"Rudder Cables - Inspection / Replacement","content":"## Rudder Cables - Inspection / Replacement","sortOrder":2},{"sectionNumber":"18/2018","sectionType":"part","heading":"18/2018","content":"## 18/2018","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in rudder cables at a specific fuselage station on a specific aircraft series. The exemption for the 1950 pulley modification was part of the original design, not scope creep."},"complexity_factors":["Single, specific mechanical issue (rudder cable wear at one location)","Only 2 defined compliance timeframes (25 hours initial, 100 hours recurring)","One clear exemption path (pulley modification per 1950 Service Bulletin)","No nested exceptions or conditional logic beyond the modification exemption","Short document with minimal cross-referencing (only references one FAA AD and one Service Bulletin)","Plain language instructions suitable for aircraft maintenance personnel"],"plain_english_summary":"This Airworthiness Directive requires Stinson 108 owners to inspect rudder cables where they wrap pulleys, bend cables into a tight U to check for broken internal strands, and replace any cable with core strand breakage before further flight. Inspections start within 25 flight hours of 14 Sept 2018 and repeat every 100 flight hours unless the Service Bulletin pulley modification is installed.\n\nIt matters because broken rudder cables can cause loss of directional control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all Univair (Stinson) 108 series aircraft and specifically targets detection and replacement of rudder cables with broken core strands. It cross-references FAA AD 50-17-02 and Stinson Service Bulletin 266 and does not broaden or narrow applicability beyond that stated material and those references."},"complexity_factors":["Technical inspection procedure requires removal of cables and bending in a tight “U” to detect core strand breakage (Requirement 1)","Mandatory replacement of any cable showing core strand breakage (Requirement 2)","Recurring compliance schedule: initial within 25 hours TIS, then at intervals not to exceed 100 hours (Compliance)","Immediate action required before further flight if breakage is found (Compliance)","Option to discontinue inspections if pulley modification per Stinson Service Bulletin 266 is completed (Note 1)","Cross-references to FAA AD 50-17-02 and Stinson Service Bulletin 266 for related procedures and history (Note 2)","Broad applicability to all Univair (Stinson) 108 series aeroplanes (Applicability)","Safety-critical nature increases operational impact despite procedural simplicity"],"plain_english_summary":"This airworthiness directive requires owners/operators of all Univair (Stinson) 108 series aeroplanes to inspect rudder cables where they pass over a fuselage pulley and to replace any cable that shows broken core strands. The inspection method is specified (remove from pulleys, bend in a tight “U” without creating permanent kinks, inspect visually or by touch).\n\nDeadlines: do the first inspection within 25 hours’ time-in-service and then every 100 hours, or replace a failed cable before further flight. Costs and compliance obligations fall to aircraft owners/operators; inspections can stop for aircraft modified per Stinson Service Bulletin 266."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-stinson-108-3-rudder-cables-inspection-replacement","history":"/api/acts/ad-stinson-108-3-rudder-cables-inspection-replacement/history","analysis":"/api/acts/ad-stinson-108-3-rudder-cables-inspection-replacement/analysis","conflicts":"/api/acts/ad-stinson-108-3-rudder-cables-inspection-replacement/conflicts","importantCases":"/api/acts/ad-stinson-108-3-rudder-cables-inspection-replacement/important-cases","documents":"/api/acts/ad-stinson-108-3-rudder-cables-inspection-replacement/documents"}}