{"id":"F2006B07294","name":"AD/TB10/26 Amdt 2 - Main Landing Gear Support Ribs","slug":"ad-tb10-26-amdt-2-main-landing-gear-support-ribs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49265,"registerId":"commonwealth-F2006B07294-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB10/26 Amdt 2 - Main Landing Gear Support Ribs","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes\n\nAD/TB10/26\n\nAmdt 2\n\n  \nMain Landing Gear Support Ribs 9/96\n\nApplicability: Models TB9, TB10 and TB200 S/no 1 to 9999.\n\nRequirement: Inspect and modify the Main Landing Gear ribs in accordance with SOCATA TB SB\n\n10.085.57 Amdt.2.\n\nNote: DGAC AD 94-265(A)R4 refers.\n\nCompliance: In accordance with the Requirement Document with effect from 15 August 1996\\. Background: This directive is to ensure the integrity of the MLG support ribs.\n\nAmendment 1 varied the inspection procedure and included the TB200 in the Applicability.\n\nAmendment 2 reflects the latest status of the Manufacturer's SB and the DGAC AD, which modify the modes of inspection depending on whether reinforcing of the wing structure has been carried out.\n\nThe original issue of this Airworthiness Directive became effective on 2 March 1995\\. Amendment 1 of this Airworthiness Directive became effective on 7 December 1995.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. The AD’s scope and procedures have been altered by amendments. Amendment 1 varied the inspection procedure and added the TB200 to the list of affected models (\"Amendment 1\"). Amendment 2 updates the AD to reflect the latest manufacturer Service Bulletin and the DGAC AD, and it modifies the modes of inspection depending on whether reinforcing of the wing structure has been carried out (\"Amendment 2\")."},"complexity_factors":["Narrow technical focus limited to MLG support ribs (low conceptual scope) — (\"Requirement\"; \"Background\").","Dependency on an external, detailed manufacturer Service Bulletin for procedural steps (SOCATA TB SB 10.085.57 Amdt.2) — (\"Requirement\").","Conditional inspection modes introduced by Amendment 2 depending on whether wing-structure reinforcing has been fitted — (\"Amendment 2\").","Multiple amendments and cross-references to a foreign authority AD (DGAC AD 94-265(A)R4) increase document-tracking and verification requirements — (\"Amendment 1\"; \"Amendment 2\"; \"Note\").","Applicability by model and serial number range requires operators to check aircraft identity/status before applying procedures — (\"Applicability\").","Fixed compliance effective date requiring timely action by operators (\"Compliance\")."],"plain_english_summary":"## What this directive does\n\nThis Airworthiness Directive (AD/TB10/26 Amdt 2) requires owners/operators of certain Socata TB9, TB10 and TB200 (Tobago) aeroplanes to inspect and, if necessary, modify the main landing gear (MLG) support ribs. The AD directs compliance with the manufacturer’s service bulletin SOCATA TB SB 10.085.57 Amdt.2. (See: \"Applicability\"; \"Requirement\").\n\n## Who it affects and who decides\n\n- Affected: Aircraft of models TB9, TB10 and TB200 with serial numbers 1 to 9999 (\"Applicability\").\n- Who decides how to comply: The detailed inspection and modification procedures are those set out in the manufacturer’s Service Bulletin cited in the Requirement (SOCATA TB SB 10.085.57 Amdt.2). The Civil Aviation Safety Authority issues and enforces the AD (header: \"CIVIL AVIATION SAFETY AUTHORITY\").\n\n## Why it matters (official claim) and what that implies\n\n- Official stated purpose: to ensure the integrity of the main landing gear support ribs (\"Background\").\n- Mechanically, the AD makes the owner/operator inspect the specified structure and carry out any modifications specified in the Service Bulletin (\"Requirement\"). Compliance must be carried out in accordance with the Requirement Document from 15 August 1996 (\"Compliance\").\n\n## How it works in practice (costs, incentives, and trade-offs)\n\n- Who pays: The owner/operator of the affected aircraft must perform or arrange the inspection and any required modification, following the manufacturer’s procedures (\"Requirement\"; \"Applicability\").\n- Incentives: Operators are required to follow the AD to meet the regulatory airworthiness requirement; non‑compliance risks regulatory enforcement (implicit in the AD structure; \"Requirement\").\n- Compliance burden: Operators must obtain and follow the manufacturer’s Service Bulletin and schedule work to inspect and, if needed, modify the ribs; the AD sets an effective compliance date (\"Requirement\"; \"Compliance\").\n- Implementation risk and discretion: Amendment 2 changes the modes of inspection depending on whether wing-structure reinforcing has been fitted, which requires the operator to determine their aircraft’s modification status before selecting the inspection method (\"Amendment 2\"; \"Requirement\"). The manufacturer’s Service Bulletin contains the specific procedural detail the operator must follow (\"Requirement\").\n\n## What changed over earlier versions\n\n- Amendment 1: varied the inspection procedure and extended applicability to include the TB200 (\"Amendment 1\").\n- Amendment 2: brings the AD into line with the latest manufacturer SB and the referenced DGAC AD and modifies inspection modes depending on whether reinforcing of the wing structure has been carried out (\"Amendment 2\").\n\n## Practical implications for markets and operators (light, source-grounded lens)\n\n- The AD places a direct operational obligation on individual aircraft owners/operators to inspect and modify structure per the manufacturer’s instructions (\"Requirement\"; \"Applicability\"). This is a compliance cost that operators must absorb or contract out; the AD does not itself change ownership, market entry, or contract rights, but it can affect operating availability and scheduling for affected aircraft while inspections/modifications are carried out (inference grounded in the AD’s required inspections/modifications and compliance timing: \"Requirement\"; \"Compliance\").\n\nReferences to the source document used for this summary: Applicability; Requirement (SOCATA TB SB 10.085.57 Amdt.2); Compliance (effective date 15 August 1996); Background; Amendment 1; Amendment 2; Note referencing DGAC AD 94-265(A)R4."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The legislation remains focused on its original purpose: ensuring the structural integrity of main landing gear support ribs on specific Socata aircraft. Amendment 2 merely updates the technical procedures to reflect current manufacturer guidance and adds a conditional inspection pathway based on prior modifications. This is a routine technical update, not a scope expansion."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined applicability criteria (model numbers and serial number range)","Single primary requirement with cross-reference to one external technical document (SOCATA Service Bulletin)","Simple amendment history explaining version changes","No nested conditional logic — only one variable condition (whether reinforcing has been carried out)","No internal cross-references to other legislation sections"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners and operators to take specific action to fix a known safety problem.\n\n**What it does:**\nThis directive orders inspections and modifications to the **main landing gear support ribs** on certain Socata Tobago aeroplanes. These ribs are structural components in the wing that help support the wheels when the plane is on the ground.\n\n**Who it affects:**\nOwners and operators of **Socata TB9, TB10, and TB200 aircraft** with serial numbers 1 through 9999.\n\n**What must be done:**\nOperators must inspect and modify the main landing gear ribs following the manufacturer's specific instructions in **Service Bulletin 10.085.57 Amendment 2** (a technical notice from the plane maker). The exact inspection method depends on whether the aircraft's wing structure has already been reinforced or not.\n\n**Why it matters:**\nThe directive prevents structural failure of the landing gear support ribs, which could lead to landing gear collapse and serious accidents. This is the **second amendment** to the original 1995 directive — it updates the inspection procedures to match the latest manufacturer and French aviation authority (DGAC) guidance.\n\n**Compliance deadline:**\nAircraft must comply with these requirements according to the manufacturer's service bulletin, effective from **15 August 1996**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb10-26-amdt-2-main-landing-gear-support-ribs","history":"/api/acts/ad-tb10-26-amdt-2-main-landing-gear-support-ribs/history","analysis":"/api/acts/ad-tb10-26-amdt-2-main-landing-gear-support-ribs/analysis","conflicts":"/api/acts/ad-tb10-26-amdt-2-main-landing-gear-support-ribs/conflicts","importantCases":"/api/acts/ad-tb10-26-amdt-2-main-landing-gear-support-ribs/important-cases","documents":"/api/acts/ad-tb10-26-amdt-2-main-landing-gear-support-ribs/documents"}}