{"id":"F2006B07277","name":"AD/TB10/10 - Hydraulic Brake Line Clearance","slug":"ad-tb10-10-hydraulic-brake-line-clearance","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49218,"registerId":"commonwealth-F2006B07277-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB10/10 - Hydraulic Brake Line Clearance","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) TB9 and TB10 (Tobago) Series Aeroplanes\n\n \n\nAD/TB10/10 Hydraulic Brake Line Clearance 11/87\n\nApplicability: All models TB9 and TB10 up to S/No 755 inclusive, except S/Nos 630, 631, 634, 636, 643, 648, 649, 656, 657, 658, 659, 661, 662, 663, 664, 750, 751, 752 and 753.\n\n \n\nRequirement: Action in accordance with Aerospatiale Socata SB No.33.\n\n \n\nNote: Bureau Veritas AD 87-118(A) refers.\n\n \n\nCompliance: Within 100 hours time in service or at the next scheduled inspection for maintenance release issue after 30 October 1987 whichever is the earlier.\n\n \n\nBackground: The manufacturer has reported instances of the cockpit hydraulic brake lines being damaged by the aileron and rudder control rods.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"No indication in the text that the AD changed scope from an earlier instrument; it sets a targeted scope (TB9/TB10 up to S/No 755 with specific exclusions) and mandates corrective action per the manufacturer's SB (Requirement) with a defined compliance window (Compliance). Responsibility and cost fall to aircraft owners/operators who must obtain and follow SB No.33 and schedule the work within the stated timeframe."},"complexity_factors":["Targeted applicability with multiple serial-number exclusions increases administrative tracking for operators and regulators (Applicability: 'All models TB9 and TB10 up to S/No 755 inclusive, except S/Nos 630, 631, ... 753').","Mandated action depends on an external manufacturer document — Aerospatiale Socata SB No.33 — so compliance requires obtaining and following that service bulletin (Requirement: 'Action in accordance with Aerospatiale Socata SB No.33').","Compliance timing provides two triggers (within 100 hours time in service or at the next scheduled inspection for maintenance release after 30 October 1987, whichever is earlier), creating scheduling choices and potential operational disruption (Compliance).","Reference to another authority (Bureau Veritas AD 87-118(A)) introduces an additional external source to consult for context or corroboration (Note).","Technical cause is interaction between control rods and hydraulic brake lines, requiring physical inspection and possible modification/repair — this is fieldwork with direct material and labour costs (Background: '...hydraulic brake lines being damaged by the aileron and rudder control rods')."],"plain_english_summary":"Requires owners/operators of Aerospatiale (Socata) TB9/TB10 aeroplanes (specified serial numbers up to S/No. 755, with listed exclusions) to inspect and, if necessary, remedy cockpit hydraulic brake lines in accordance with the manufacturer's Service Bulletin No.33. The AD responds to reports that aileron and rudder control rods can damage those lines. Operators must comply within 100 flight hours or at the next scheduled maintenance release after 30 October 1987, so operators bear the inspection/modification cost and any scheduling impact."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating a fix for brake line clearance issues."},"complexity_factors":["Single, specific technical requirement referencing an external manufacturer document (Service Bulletin No. 33)","Simple applicability clause with explicit serial number list (one range plus 19 specific exemptions)","Straightforward compliance deadline (100 hours or next inspection, whichever is earlier)","No defined terms section, no cross-references to other legislation beyond a note about a French aviation authority document","Total length is approximately 150 words"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft instead of cars.\n\n**What it does:** It requires owners and operators of specific Socata TB9 and TB10 aeroplanes to inspect and fix a dangerous design flaw where hydraulic brake lines in the cockpit can be damaged by moving control rods (the mechanical linkages that connect the pilot's controls to the wings and tail).\n\n**Who it affects:** Owners and operators of TB9 and TB10 aircraft with serial numbers up to 755, **except** for a long list of specific serial numbers (630, 631, 634, 636, 643, 648, 649, 656, 657, 658, 659, 661, 662, 663, 664, 750, 751, 752, and 753). These exempted aircraft were apparently built differently or already fixed.\n\n**What must be done:** Follow the manufacturer's Service Bulletin No. 33 (a technical instruction document) to fix the brake line clearance issue.\n\n**When it must be done:** Within 100 hours of flying time, or at the next scheduled maintenance check after 30 October 1987 — whichever comes first.\n\n**Why it matters:** Damaged brake lines can leak hydraulic fluid, leading to brake failure. Since brakes are fairly important for stopping aircraft, this is a critical safety issue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb10-10-hydraulic-brake-line-clearance","history":"/api/acts/ad-tb10-10-hydraulic-brake-line-clearance/history","analysis":"/api/acts/ad-tb10-10-hydraulic-brake-line-clearance/analysis","conflicts":"/api/acts/ad-tb10-10-hydraulic-brake-line-clearance/conflicts","importantCases":"/api/acts/ad-tb10-10-hydraulic-brake-line-clearance/important-cases","documents":"/api/acts/ad-tb10-10-hydraulic-brake-line-clearance/documents"}}