{"id":"F2006L00404","name":"AD/GAZELLE/20 Amdt 1 - Tail Gearbox (TGB) Support Tripod","slug":"ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117055,"registerId":"commonwealth-F2006L00404-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter SA341 and SA342 (Gazelle) Ser","sectionType":"division","heading":"Eurocopter SA341 and SA342 (Gazelle) Series Helicopters","content":"### Eurocopter SA341 and SA342 (Gazelle) Series Helicopters\n\n| AD/GAZELLE/20 Amdt 1 | Tail Gearbox (TGB) Support Tripod | 3/2006 |\n| -------------------- | --------------------------------- | ------ |\n\n| Applicability: | Model SA 341 G and SA 342 J helicopters, equipped with TGB support tripods part number 341A23-1136-00, -01, and -02.                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect for cracks in accordance with paragraph 2.B.1 of Eurocopter SA 341/342 Alert Service Bulletin (ASB) No. 05.32 R1, or later EASA approved revision.If cracking is evident, before further flight, replace the TGB support tripod with a serviceable tripod assembly.Before installation on a helicopter of a tripod assembly held as a spare, engrave the identification of the tripod assembly in accordance with paragraph 2.B.2. of ASBNo. 05.32 R1, or later EASA approved revision.Note: DGAC AD F-1997-144-038 R1 refers. |\n| Compliance:    | Inspect during each ALF-check, without exceeding 10 flight hours between two successive checks.                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n|                | This Amendment becomes effective on 16 March 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | Reports were received of cracks in the tripod arm welds on helicopters in service.Amendment 1 is issued in response to a revision of the related DGAC AD, which introduces the latest revision of the Requirement document.                                                                                                                                                                                                                                                                                                            |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n3 February 2006","sortOrder":0},{"sectionNumber":"AD/GAZELLE/20 Amdt 1","sectionType":"part","heading":"AD/GAZELLE/20 Amdt 1","content":"## AD/GAZELLE/20 Amdt 1","sortOrder":1},{"sectionNumber":"Tail Gearbox (TGB) Support Tripod","sectionType":"part","heading":"Tail Gearbox (TGB) Support Tripod","content":"## Tail Gearbox (TGB) Support Tripod","sortOrder":2},{"sectionNumber":"3/2006","sectionType":"part","heading":"3/2006","content":"## 3/2006","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive (AD/GAZELLE/20). The amendment simply updates the referenced technical document to its latest revision (ASB No. 05.32 R1) in response to a corresponding update by the French aviation authority (DGAC). The scope remains tightly focused on the original safety issue: cracks in TGB support tripods. No expansion of applicability or additional requirements beyond the original inspection and replacement mandate."},"complexity_factors":["Single, specific mechanical component addressed (tail gearbox support tripod)","Only three specific part numbers affected","Straightforward inspection requirement with clear compliance interval (every ALF-check, max 10 flight hours)","Simple conditional logic: if cracked → replace before flight","References only one external technical document (Eurocopter ASB No. 05.32 R1)","No nested exceptions or complex definitional sections","Total length is approximately 200 words of substantive content"],"plain_english_summary":"This safety directive requires operators of Eurocopter Gazelle SA 341 G and SA 342 J helicopters with specific tripod part numbers to inspect the tail-rotor gearbox support tripod for cracks at every routine ALF check (no more than 10 flight hours between checks) and to replace any cracked tripod before flight. Spare tripod assemblies must be permanently identified before fitting.\n\nIt targets owners, maintenance engineers, and parts managers to prevent tail-rotor failure and loss of control."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 1 updates the requirement document reference to the latest Eurocopter ASB/EASA-approved revision but keeps the same applicability (SA341 G and SA342 J with specified tripod part numbers) and the same observable safety action (inspection, replace if cracked, mark spares). The background states the change responds to a DGAC AD revision introducing the latest Requirement document (Background)."},"complexity_factors":["Targeted applicability to specific airframe models and three exact tripod part numbers (Applicability) increases tracking and parts-control tasks.","Mandatory inspection cadence tied to ALF-checks with a strict maximum interval of 10 flight hours (Compliance) raises operational frequency and scheduling burden.","Immediate replacement requirement — \"before further flight\" if cracking is found (Requirement) creates potential operational downtime and direct replacement costs for operators.","Cross-reference to an external service document and its future EASA-approved revisions (paragraph 2.B.1 and 2.B.2 of Eurocopter ASB No. 05.32 R1) requires monitoring for subsequent revisions and creates procedural dependency.","Engraving/identification requirement for spare tripod assemblies before installation (Requirement) imposes a traceability/administration step on spares management.","Regulatory provenance and update: Amendment follows a related DGAC AD revision (Background), requiring administrators and operators to reconcile multiple authority documents."],"plain_english_summary":"This amendment requires operators of Eurocopter SA341 G and SA342 J helicopters fitted with TGB support tripods (part nos. 341A23-1136-00/-01/-02) to inspect the tripod for cracks at every ALF check (and no more than 10 flight hours between checks), replace any cracked tripod before further flight, and engrave spare tripods per the Eurocopter service bulletin. CASA issued the amendment effective 16 March 2006 after reports of tripod-arm weld cracking; operators pay inspection, replacement and marking costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod","history":"/api/acts/ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod/history","analysis":"/api/acts/ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod/analysis","conflicts":"/api/acts/ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod/conflicts","importantCases":"/api/acts/ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod/important-cases","documents":"/api/acts/ad-gazelle-20-amdt-1-tail-gearbox-tgb-support-tripod/documents"}}