{"id":"F2006B07326","name":"AD/TB20/22 Amdt 1 - Cabin Door Catch","slug":"ad-tb20-22-amdt-1-cabin-door-catch","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49362,"registerId":"commonwealth-F2006B07326-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB20/22 Amdt 1 - Cabin Door Catch","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes\n\n \n\n# AD/TB20/22\n\nAmdt 1\n\nApplicability: Model TB20 and TB21.\n\n# Cabin Door Catch 12/91\n\n \n\nRequirement: Inspect and retire the cabin door catches in accordance with the technical requirements of DGAC AD 91-143 (A) R1.\n\nNote: Socata TB SB 58/1 refers.\n\nCompliance: The compliance date of the previous issue of this Directive was 3 October 1991. This Amendment is effective from 12 December 1991.\n\n \n\nBackground: Instances of cracked catches on cabin access doors have been attributed to incorrect adjustment. This condition may result in failure of the door catch.\n\n \n\nThis Amendment provides for additional part number replacement catches.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1794},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The amendment maintains the original safety purpose of preventing cabin door catch failure on TB20/TB21 aircraft. The change is limited to expanding the list of approved replacement part numbers, which is consistent with the original scope rather than an expansion into new operational areas."},"complexity_factors":["Single operative requirement referencing one external technical standard (DGAC AD 91-143)","No defined terms section or interpretation provisions","Minimal conditional logic—applicability is determined solely by aircraft model number","Extremely short length with straightforward compliance pathway","Amendment consists only of adding part numbers to existing requirement list"],"plain_english_summary":"**What this does:** This is a safety rule (called an Airworthiness Directive) for owners of specific light aircraft—the Socata TB20 and TB21 Trinidad models. It requires you to inspect the cabin door latches (catches) and replace them if they show wear, using specific replacement parts.\n\n**Why it matters:** Door catches have been found cracked due to poor adjustment. If the catch fails, the cabin door could open unexpectedly during flight, creating a safety hazard.\n\n**What changed in this version:** This update expands the list of approved replacement part numbers for the door catches (adding to the previous requirements without changing the core safety task).\n\n**Who is affected:** Anyone operating or maintaining Model TB20 or TB21 aircraft must follow the technical inspection standards referenced from the French aviation authority (DGAC)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb20-22-amdt-1-cabin-door-catch","history":"/api/acts/ad-tb20-22-amdt-1-cabin-door-catch/history","analysis":"/api/acts/ad-tb20-22-amdt-1-cabin-door-catch/analysis","conflicts":"/api/acts/ad-tb20-22-amdt-1-cabin-door-catch/conflicts","importantCases":"/api/acts/ad-tb20-22-amdt-1-cabin-door-catch/important-cases","documents":"/api/acts/ad-tb20-22-amdt-1-cabin-door-catch/documents"}}