{"id":"F2007L00090","name":"AD/TB10/20 Amdt 3 - Exhaust System Clamp Locknuts","slug":"ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68143,"registerId":"commonwealth-F2007L00090-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Aerospatiale (Socata) TB9 and TB10 (Toba","sectionType":"division","heading":"Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes","content":"### Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes\n\n| AD/TB10/20 Amdt 3 | Exhaust System Clamp Locknuts | 2/2007 |\n| ----------------- | ----------------------------- | ------ |\n\n| Applicability: | All TB10 aircraft - except the aircraft incorporating:HSJ Aviation (HSJ) Engineering Order HSJ 1289 or Auto Avia Drawings 92/334/D1 or 92/334/DR Issue 2, and HSJ Engineering Order HSJ 1486; orAircraft Exhausts Australia (AEA) modified ‘slip joint’ exhaust system in accordance with AEA Service Bulletin (SB) 4147SJ/1 original issue or later CASA approved revisions.                                                                                                                                                                                                                                                                                                |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect, modify and assemble the exhaust system in accordance with SOCATA Service Bulletin (SB) No. SB 10-073-78 Amendment 2 or later DGAC approved revisions.Note: DGAC Airworthiness Directive 92-206(A) R3 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Compliance:    | Within 50 hours time in service after the effective date of this Directive, unless previously accomplished in accordance with earlier amendments of this AD; and repetitively thereafter at each disassembly of the exhaust system.                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | This Amendment becomes effective on 15 February 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Background:    | This AD was originally issued to address concern for the integrity of the TB10 exhaust system following two TB10 exhaust system in-flight separation events in Australia.The current Amendment updates the applicability list and excludes TB10 aircraft incorporating AEA modified ‘slip joint’ exhaust system from AD Requirements.Amendment 2 reflected the manufacturer’s second revision of the requirement document and became effective on 24 April 1997.Amendment 1 of the AD reflected the manufacturer’s revision to the part numbers of the replacement exhaust pipe and the long manifold to exhaust pipe clamps. Amendment 1 became effective on 28 March 1996. |\n\n|     | The original issue of this Airworthiness Directive became effective on 26 May 1994. |\n| --- | ----------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n4 January 2007","sortOrder":0},{"sectionNumber":"AD/TB10/20 Amdt 3","sectionType":"part","heading":"AD/TB10/20 Amdt 3","content":"## AD/TB10/20 Amdt 3","sortOrder":1},{"sectionNumber":"Exhaust System Clamp Locknuts","sectionType":"part","heading":"Exhaust System Clamp Locknuts","content":"## Exhaust System Clamp Locknuts","sortOrder":2},{"sectionNumber":"2/2007","sectionType":"part","heading":"2/2007","content":"## 2/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. Amendment 3 updates the applicability list and expressly excludes TB10s fitted with the AEA modified ‘slip joint’ exhaust system (AEA SB 4147SJ/1), and reflects manufacturer revisions to the service document and part numbers noted in earlier amendments (Background)."},"complexity_factors":["Applicability exclusions reference precise engineering orders and drawings (HSJ Engineering Order HSJ 1289; Auto Avia Drawings 92/334/D1 or 92/334/DR Issue 2; HSJ Engineering Order HSJ 1486) and an AEA service bulletin (AEA SB 4147SJ/1) — requires careful fleet-level identification of affected aircraft (Applicability).","Normative technical requirement is to follow SOCATA Service Bulletin No. SB 10-073-78 Amendment 2 or later DGAC‑approved revisions, creating dependence on external technical documents and foreign authority approvals (Requirement).","Compliance timing imposes an initial deadline (within 50 hours time in service) plus a recurring trigger at each exhaust disassembly, producing both a near-term retrofit burden and an ongoing maintenance cost/administrative check (Compliance).","History of amendments and cross-references to DGAC ADs and multiple amendment versions increases traceability burden for maintainers and regulators (Background; Requirement).","Operational impact concentrated on TB10 owners/operators and A&P/maintenance organisations who must perform/record the work and decide acceptability of previously fitted modifications (who pays and who decides).","Enforcement and acceptable alternatives depend on later DGAC/CASA approvals and the CASA delegate’s effective date — introduces regulatory discretion and reliance on updated approvals (Effective date; Requirement)."],"plain_english_summary":"Requires inspection, modification and correct assembly of exhaust-system clamp locknuts on Aerospatiale (Socata) TB10 aeroplanes, carried out to SOCATA Service Bulletin SB 10-073-78 Amendment 2 or later DGAC‑approved revisions. It applies to all TB10s except aircraft fitted with specified HSJ engineering orders/drawings or an AEA ‘slip joint’ exhaust (AEA SB 4147SJ/1). Compliance must occur within 50 hours flying time and each time the exhaust is disassembled; owners/operators pay for the maintenance."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive has evolved significantly from its original 1994 purpose of addressing exhaust system integrity. Amendment 3 (2007) substantially narrows the scope by excluding aircraft with specific alternative modifications (HSJ and AEA systems), effectively creating a two-tier regulatory regime. The original blanket requirement has been progressively refined through three amendments to incorporate manufacturer revisions and recognise approved alternative designs, shifting from universal application to a more targeted approach based on specific equipment fit."},"complexity_factors":["Multiple amendment history referenced (original 1994, Amendment 1 1996, Amendment 2 1997, current Amendment 3 2007)","Nested applicability exclusions — aircraft are exempt if they have specific Engineering Orders OR specific drawings OR specific Service Bulletins","Cross-reference to French aviation authority (DGAC) approval required for alternative document revisions","Conditional compliance timing ('unless previously accomplished in accordance with earlier amendments')","Repetitive compliance trigger ('at each disassembly') creates ongoing obligation"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Socata TB10 Tobago aeroplanes to inspect, modify and reassemble their exhaust systems per the manufacturer’s Service Bulletin (SB 10‑073‑78 Amendment 2) to secure exhaust clamp locknuts. Compliance is required within 50 flight hours and whenever the exhaust is dismantled. It applies to all TB10s except those already fitted with approved alternative exhausts (HSJ Aviation or Aircraft Exhausts Australia). The aim is to prevent in‑flight exhaust separations and associated safety risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts","history":"/api/acts/ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts/history","analysis":"/api/acts/ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts/analysis","conflicts":"/api/acts/ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts/conflicts","importantCases":"/api/acts/ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts/important-cases","documents":"/api/acts/ad-tb10-20-amdt-3-exhaust-system-clamp-locknuts/documents"}}