{"id":"F2009L01679","name":"AD/TSA-600/18 - Main Landing Gear Clamshell - Door Placard - Replacement - CANCELLED","slug":"ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78520,"registerId":"commonwealth-F2009L01679-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Aerostar (Piper/Ted Smith) 600 and 700 S","sectionType":"division","heading":"Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes","content":"### Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\n| AD/TSA-600/18 | Main Landing GearClamshell - Door Placard - Replacement | 6/2009 |\n| ------------- | ------------------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                            |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 4 June 2009.                                                                                                                                                                                  |\n| Background:  | This unique Australian AD specified replacement of the MLG clamshell door placard in accordance with Piper Aerostar SL No. 600-57 within 100 hours time in service after December 1978. The AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n24 April 2009","sortOrder":0},{"sectionNumber":"AD/TSA-600/18","sectionType":"part","heading":"AD/TSA-600/18","content":"## AD/TSA-600/18","sortOrder":1},{"sectionNumber":"Main Landing GearClamshell - Door Placar","sectionType":"part","heading":"Main Landing GearClamshell - Door Placard - Replacement","content":"## Main Landing Gear  \nClamshell - Door Placard - Replacement","sortOrder":2},{"sectionNumber":"6/2009","sectionType":"part","heading":"6/2009","content":"## 6/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2205},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"This instrument completely eliminates the scope of the original AD by revoking the mandatory requirement to replace main landing gear clamshell door placards. The original directive imposed a positive maintenance obligation; this cancellation removes that obligation entirely, reducing the scope to zero."},"complexity_factors":["Single operative provision cancelling a previous directive","No defined terms or interpretation section","No conditional logic, exceptions, or procedural steps","Minimal cross-referencing (only historical reference to predecessor AD and manufacturer service letter in background section)"],"plain_english_summary":"**What this does:** This cancels a previous aviation safety directive (AD/TSA-600/18) that required owners of specific aircraft to replace a warning label (placard) on the main landing gear doors.\n\n**Who it affects:** Owners and operators of Aerostar (Piper/Ted Smith) 600 and 700 series aeroplanes.\n\n**What changed:** The original rule required replacing the main landing gear clamshell door placard within 100 hours of flight time after December 1978, following manufacturer service letter No. 600-57. As of 4 June 2009, this requirement no longer applies—you do not need to replace this placard anymore.\n\n**Why it matters:** This removes an outdated maintenance obligation, saving aircraft owners time and money on unnecessary placard replacements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled","history":"/api/acts/ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled/history","analysis":"/api/acts/ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled/analysis","conflicts":"/api/acts/ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled/conflicts","importantCases":"/api/acts/ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled/important-cases","documents":"/api/acts/ad-tsa-600-18-main-landing-gear-clamshell-door-placard-replacement-cancelled/documents"}}