{"id":"F2020L01119","name":"AD/GC-1/4 Landing Gear Rework","slug":"ad-gc-1-4-landing-gear-rework","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":113531,"registerId":"commonwealth-F2020L01119-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-1/4 | Landing Gear Rework | 18/2020 |\n| --------- | ------------------- | ------- |\n\n| Applicability: | All Swift Museum Foundation GC-1A and GC-1B model aircraft. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. a. Inspect all bushings in all landing gear pivot points for wear that would allow fore and aft travel of the main landing gear. The total fore and aft travel of the wheels, measured at the centre of the axle, due to the cumulative slack in the worn bushing, must not be more than 3/8 of an inch. This check must be made with the hydraulic pressure relieved on the system and with the landing gear in two positions:i. Unlocked and in an intermediate position near to, but not in, the full down position; andii. With the landing gear just entering the wheel well. If the total fore and aft travel of the wheel of either landing gear is more than 3/8 of an inch in either position, the landing gear assembly must be repaired as necessary to reduce this travel to less than 3/8 of an inch.b. Install spacer emergency landing gear pull down system in accordance with TEMCO Service Bulletin No. 28, as in force from time to time, to prevent inadvertent unthreading of the drive screw.c. Inspect the emergency extension system for proper adjustment in accordance with paragraphs 8, 9 and 12 of TEMCO Service Bulletin No. 28, as in force from time to time.Note 1: United States of America Federal Aviation Administration (FAA) AD 51‑11‑04 is the source document for the requirements of this AD.Note 2: The words “as in force from time to time” require compliance with the most recent version of the referenced document. |\n| Compliance: | 1. a. Unless previously accomplished, within 6 months after the commencement date of this AD and thereafter at every 100 hours’ time in service or every 12 months, whichever occurs first.b. Unless previously accomplished, at 100 hours’ time in service or 12 months, whichever occurs first.c. Unless previously accomplished, within 6 months after the commencement date of this AD and thereafter at every 100 hours’ time in service or every 12 months, whichever occurs first. |\n\n| | This AD commences on 17 September 2020. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | An audit of the Australian Aircraft Register found that Swift Museum Foundation GC-1A 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.This AD is issued to mandate requirements equivalent to FAA AD 51-11-04. |\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\n25 August 2020","sortOrder":0},{"sectionNumber":"AD/GC-1/4","sectionType":"part","heading":"AD/GC-1/4","content":"## AD/GC-1/4","sortOrder":1},{"sectionNumber":"Landing Gear Rework","sectionType":"part","heading":"Landing Gear Rework","content":"## Landing Gear Rework","sortOrder":2},{"sectionNumber":"18/2020","sectionType":"part","heading":"18/2020","content":"## 18/2020","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing specific landing gear safety issues in Swift GC-1A/B aircraft. It does not expand beyond the mechanical systems identified in the source FAA AD 51-11-04."},"complexity_factors":["Short, single-purpose instrument (approximately 400 words)","Only 3 distinct technical requirements with clear pass/fail criteria (3/8 inch measurement)","Simple compliance schedule with two variables (hours OR months)","References external technical documents (TEMCO Service Bulletin No. 28) but incorporates them by reference with 'as in force from time to time' clause","No defined terms section, no nested exceptions, no conditional logic beyond 'unless previously accomplished'","Single applicability criterion (specific aircraft models)"],"plain_english_summary":"This AD mandates inspections and a safety modification for Swift Museum Foundation GC‑1A/GC‑1B aircraft operated in Australia. Owners must inspect landing‑gear pivot bushings for excessive wheel play, install a spacer to prevent the emergency‑extension screw from backing out, and verify emergency‑extension adjustment.\n\nIt affects anyone operating or maintaining these vintage Swifts. The rule addresses landing and takeoff instability from worn bushings and a known emergency‑gear failure mode, aligning Australian aircraft with long‑standing FAA safety action."},"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Before this instrument, equivalent FAA airworthiness requirements were not mandated in Australia for Swift GC‑1A/GC‑1B aircraft (Background). This AD brings all Australian‑registered Swift GC‑1A and GC‑1B aeroplanes within a mandatory compliance regime, requiring inspections, repairs, installation of a spacer per TEMCO SB No. 28, and recurring inspection intervals (Applicability; Requirement; Compliance)."},"complexity_factors":["Technical measurement requirement (maximum cumulative fore‑and‑aft travel of wheel 3/8 inch) increases precision and tooling needs for inspections (Requirement 1.a).","Mandated installation and adjustment must follow an external Service Bulletin (TEMCO SB No. 28), with the AD requiring the latest version (“as in force from time to time”), creating version‑tracking obligation for operators (Requirement 1.b and 1.c; Note 2).","Multiple distinct compliance timings and recurring intervals (6 months then every 100 hours or 12 months; separate timing for paragraph 1.b) create administrative scheduling complexity (Compliance).","Operational procedure constraints: inspections must be done with hydraulic pressure relieved and in two specific gear positions, adding procedural steps and potential downtime (Requirement 1.a).","Cross‑reference to FAA AD 51‑11‑04 as the source document requires alignment with an overseas regulatory instrument (Note 1), which can affect interpretation and acceptable corrective actions."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Swift Museum Foundation GC‑1A and GC‑1B aeroplanes in Australia to inspect landing‑gear pivot bushings for excess fore‑and‑aft play, install a spacer on the emergency gear pull‑down, and check the emergency extension adjustment. It sets repeat inspection intervals and repair thresholds (maximum allowed wheel travel 3/8 inch) and references TEMCO Service Bulletin No. 28 for installation and adjustment. Owners/operators pay for inspections, repairs and parts; maintenance providers must follow the referenced service bulletin and CASA’s AD timetable."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gc-1-4-landing-gear-rework","history":"/api/acts/ad-gc-1-4-landing-gear-rework/history","analysis":"/api/acts/ad-gc-1-4-landing-gear-rework/analysis","conflicts":"/api/acts/ad-gc-1-4-landing-gear-rework/conflicts","importantCases":"/api/acts/ad-gc-1-4-landing-gear-rework/important-cases","documents":"/api/acts/ad-gc-1-4-landing-gear-rework/documents"}}