{"id":"F2020L01120","name":"AD/GC-1/5 Landing Gear Stop Ring","slug":"ad-gc-1-5-landing-gear-stop-ring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":113533,"registerId":"commonwealth-F2020L01120-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Swift Museum Foundation GC-1A and GC-1B ","sectionType":"part","heading":"Swift Museum Foundation GC-1A and GC-1B Series Aeroplanes","content":"# Swift Museum Foundation GC-1A and GC-1B Series Aeroplanes\n\n| AD/GC-1/5 | Landing Gear Stop Ring | 18/2020 |\n| --------- | ---------------------- | ------- |\n\n| Applicability: | Swift Museum Foundation GC-1A and GC-1B model aircraft fitted with Adel Precision Products Corporation landing gear with forged aluminium torque knees. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement: | 1. Install a suitable external stop or other equivalent means which will function as a safety measure in case of failure of the internal stop ring.2. Examine the Adel strut assembly stop ring and replace if the stop ring is loose or shows signs of separation at the braze. After reassembly, the external stop must be installed so that there exists a clearance of 1/32 to 1/8 inch between the face of the stop and side of the strut cylinder with the gear fully extended. In the event there is insufficient clearance, the external stop must be reworked until the proper clearance is obtained.3. Re-check the clearance mentioned in requirement 2, with the strut fully extended. If there is no clearance between the external safety stop and the strut cylinder, disassemble the strut and examine the internal stop ring for indications of failure. If failure of the stop ring is apparent, the inner cylinder assembly, Adel P/N 16084, must be replaced or suitably reworked.Note 1: United States of America Federal Aviation Administration (FAA) AD 58‑10‑03 is the source document for the requirements of this AD. |\n| Compliance: | 1. Unless previously accomplished, within 6 months after the commencement date of this AD.2. Unless previously accomplished, at the time of installation of the external stop in accordance with Requirement 1, or within the next 100 hours’ time in service.3. At intervals not to exceed 100 hours’ time in service. |\n| | This AD commences on 17 September 2020. |\n| Background: | Failures have been reported of the stop ring brazed to the inner piston strut. Failures resulted in the piston sliding out of the strut and the torque knees assuming a straight position. This overextension of the strut precludes gear retraction into the wheel well.An audit of the Australian Aircraft Register found that Swift Museum Foundation GC-1B aircraft have been on the register for some time and that requirements equivalent to the applicable FAA ADs have not previously been mandated in Australia for these aircraft. |\n\n| | This AD is issued to mandate requirements equivalent to FAA AD 58-10-03. |\n| --- | ------------------------------------------------------------------------ |\n\n![A drawing of a face\nDescription automatically generated](image.001.jpeg)\n\nPieter van Dijk \nDelegate of the Civil Aviation Safety Authority\n\n28 August 2020","sortOrder":0},{"sectionNumber":"AD/GC-1/5","sectionType":"part","heading":"AD/GC-1/5","content":"## AD/GC-1/5","sortOrder":1},{"sectionNumber":"Landing Gear Stop Ring","sectionType":"part","heading":"Landing Gear Stop Ring","content":"## Landing Gear Stop Ring","sortOrder":2},{"sectionNumber":"18/2020","sectionType":"part","heading":"18/2020","content":"## 18/2020","sortOrder":3}],"analysis":{"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":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical failure mode in a specific aircraft type's landing gear system. It does not expand beyond the safety-critical issue identified in the source FAA AD 58-10-03."},"complexity_factors":["Single, specific mechanical issue with clear physical remedy","Only 3 main requirements with sequential dependencies","Limited applicability (one aircraft model series with specific landing gear configuration)","Precise but simple measurement requirement (1/32 to 1/8 inch clearance)","Straightforward compliance timeline (6 months, 100 hours time-in-service)","No nested definitions or extensive cross-referencing to other legislation","Background explanation is concise and directly supports the requirements"],"plain_english_summary":"Owners/operators of Swift Museum Foundation GC-1A and GC-1B aircraft in Australia with Adel Precision landing gear (forged aluminium torque knees) must install an external mechanical backup stop and inspect the brazed internal stop ring for cracks or looseness. \n\nThe AD requires replacement if faulty, setting a 1/32–1/8\" clearance when extended and repeating clearance inspections every 100 flight hours to prevent gear over-extension, collapse, or jamming; it aligns Australian rules with an FAA 1958 order."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The AD extends Australian regulatory obligations by mandating FAA‑equivalent corrective and recurrent actions for Swift GC‑1A/GC‑1B aeroplanes with Adel forged aluminium torque knees where such mandates were previously absent from the Australian register (Background; 'This AD is issued to mandate requirements equivalent to FAA AD 58‑10‑03'). Owners/operators must now install external stops, inspect and, if necessary, replace or rework the internal stop ring/inner cylinder (Adel P/N 16084) within specified timeframes and at recurring 100‑hour intervals (Requirements; Compliance)."},"complexity_factors":["Technical specificity: references a particular inner cylinder assembly part number (Adel P/N 16084) that may require exact replacement or rework (Requirement 3).","Tight physical tolerances: external stop must leave 1/32\"–1/8\" clearance with the gear fully extended, requiring precise measurement and potential rework (Requirement 2).","Conditional, multi‑step procedure: sequence of install, inspect, rework, disassemble and replace dependent on measured clearance and evidence of failure (Requirements 1–3).","Recurring inspections: mandatory re‑checks at intervals not to exceed 100 hours’ time in service, creating ongoing compliance workload (Compliance, items 2–3).","Compliance timelines: initial compliance window of 6 months from commencement plus staged requirements tied to next 100 hours or installation timing (Compliance).","Narrow applicability but regulatory catch‑up: targets specific GC‑1A/GC‑1B aircraft with Adel landing gear where equivalent FAA requirements were not previously mandated in Australia (Applicability; Background).","Regulatory alignment: this AD explicitly implements requirements equivalent to FAA AD 58‑10‑03, which may require sourcing FAA‑specified fixes or methods (Note 1; 'This AD is issued...').","Potential for shop/field work: requirement to disassemble strut and examine brazed stop ring involves skilled labour and access to parts and tooling (Requirement 2–3)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Swift Museum Foundation GC‑1A and GC‑1B aeroplanes fitted with Adel forged‑aluminium torque‑knee landing gear to install an external landing‑gear safety stop (or equivalent), inspect the internal stop ring, and repair or replace components if the ring is loose or has failed. The Civil Aviation Safety Authority mandates the work; aircraft owners/operators pay for parts, installation and recurring 100‑hour inspections to prevent piston overextension that can block gear retraction."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gc-1-5-landing-gear-stop-ring","history":"/api/acts/ad-gc-1-5-landing-gear-stop-ring/history","analysis":"/api/acts/ad-gc-1-5-landing-gear-stop-ring/analysis","conflicts":"/api/acts/ad-gc-1-5-landing-gear-stop-ring/conflicts","importantCases":"/api/acts/ad-gc-1-5-landing-gear-stop-ring/important-cases","documents":"/api/acts/ad-gc-1-5-landing-gear-stop-ring/documents"}}