{"id":"F2007L01354","name":"AD/TB20/22 Amdt 2 - Cabin Door Catch","slug":"ad-tb20-22-amdt-2-cabin-door-catch","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65614,"registerId":"commonwealth-F2007L01354-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Aerospatiale (Socata) TB20 (Trinidad) Se","sectionType":"division","heading":"Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes","content":"### Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes\n\n| AD/TB20/22 Amdt 2 | Cabin Door Catch | 6/2007 |\n| ----------------- | ---------------- | ------ |\n\n| Applicability: | Model TB 20 and TB 21 aircraft, all serial numbers, equipped with cabin access door hooks made of aluminium alloy.                                                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Check aluminium alloy cabin access door hooks for cracks in accordance with the Accomplishment Instructions of EASA SOCATA Service Bulletin No.10-058 Amdt 2.2. Remove and discard AU4G aluminium alloy cabin access door hooks and replace them with part number TB 10 250 72 101 steel hooks.Note: EASA AD 2007-0101 refers.                                                                                  |\n| Compliance:    | 1. At the next scheduled 100 hour inspection or annual inspection after 7 June 2007, whichever occurs first. Inspect thereafter at intervals not to exceed 110 flight hours; until alloy hooks are replaced with part number TB 10 250 72 101 steel hooks.2. Upon the accumulation of 1,500 hours time in service of the alloy hooks, or by 31 December 2011, whichever occurs first; unless already accomplished. |\n|                | This Amendment becomes effective on 7 June 2007.                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | Instances of cracked catches on cabin access doors have been attributed to incorrect adjustment. This condition may result in failure of the door catch.Amendment 1 provided for additional part number replacement catches.                                                                                                                                                                                       |\n\n|     | Amendment 2 is issued in response to a new EASA AD, which limits applicability to aircraft equipped with alloy cabin access door hooks, and requires eventual replacement of the alloy hooks with part number TB 10 250 72 101 steel hooks. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n24 April 2007","sortOrder":0},{"sectionNumber":"AD/TB20/22 Amdt 2","sectionType":"part","heading":"AD/TB20/22 Amdt 2","content":"## AD/TB20/22 Amdt 2","sortOrder":1},{"sectionNumber":"Cabin Door Catch","sectionType":"part","heading":"Cabin Door Catch","content":"## Cabin Door Catch","sortOrder":2},{"sectionNumber":"6/2007","sectionType":"part","heading":"6/2007","content":"## 6/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 narrows applicability to only those TB20/TB21 aircraft equipped with aluminium-alloy cabin access door hooks and adds a mandatory eventual replacement of the alloy hooks with steel part TB 10 250 72 101. The instrument explicitly responds to a new EASA AD and limits applicability while setting a replacement deadline and inspection regime (Amendment note; Requirement; Compliance)."},"complexity_factors":["Limited, specific applicability to TB20/TB21 aircraft fitted with aluminium-alloy cabin door hooks (Applicability).","Two-stage compliance triggers: next scheduled 100‑hour or annual inspection (whichever first) and recurring inspections every 110 flight hours until replacement (Compliance).","Final replacement requirement tied to hook time-in-service (1,500 hours) or a calendar deadline (31 Dec 2011) (Compliance).","Mandated part-numbered replacement (steel hook PN TB 10 250 72 101) and removal/discard of AU4G alloy hooks (Requirement).","Dependence on external technical instructions: inspections per EASA SOCATA Service Bulletin No.10-058 Amdt 2.2 and reference to EASA AD (Requirement).","Operational and cost impacts fall primarily on operators (inspection labour, part purchase, and installation), and require tracking hook hours and maintenance scheduling (Compliance)."],"plain_english_summary":"This instrument requires operators of Aerospatiale (Socata) TB20 and TB21 aeroplanes fitted with aluminium-alloy cabin-door hooks to inspect those hooks for cracks and to replace alloy hooks with steel part TB 10 250 72 101 (Requirement). It affects all serial numbers with alloy hooks and took effect 7 June 2007 (Applicability; Compliance). Operators pay for inspections and replacements; inspections must occur at the next 100‑hour or annual check and then every 110 flight hours until replacement, with replacement by 1,500 hook hours or 31 Dec 2011 (Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical defect in specific aircraft models. Amendment 2 slightly refines the applicability (limiting to alloy-equipped aircraft) and strengthens the remedy (mandating replacement), but does not expand beyond the original safety purpose of preventing cabin door catch failures."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 defined terms implicitly used (applicability and compliance)","Simple conditional structure: 'if equipped with alloy hooks, then inspect and replace'","Clear, unambiguous deadlines with only two alternative triggers (whichever occurs first)","No cross-referencing to other legislation beyond a single reference to an EASA service bulletin and AD","Single purpose: inspect and replace one specific part on two specific aircraft models"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Socata TB20/TB21 aeroplanes fitted with aluminium cabin-door hooks to inspect for cracking and to replace the aluminium hooks with steel ones. Cracked hooks can allow an in-flight door failure, so the AD makes these actions mandatory to ensure safety.\n\nAs Amendment 2, it applies only to aircraft with aluminium (not already steel) hooks and moves from repeated inspections alone to a mandated eventual replacement on a set inspection/replacement schedule."},"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-tb20-22-amdt-2-cabin-door-catch","history":"/api/acts/ad-tb20-22-amdt-2-cabin-door-catch/history","analysis":"/api/acts/ad-tb20-22-amdt-2-cabin-door-catch/analysis","conflicts":"/api/acts/ad-tb20-22-amdt-2-cabin-door-catch/conflicts","importantCases":"/api/acts/ad-tb20-22-amdt-2-cabin-door-catch/important-cases","documents":"/api/acts/ad-tb20-22-amdt-2-cabin-door-catch/documents"}}