{"id":"F2006B07279","name":"AD/TB10/12 Amdt 1 - Fuel Tanks","slug":"ad-tb10-12-amdt-1-fuel-tanks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49223,"registerId":"commonwealth-F2006B07279-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB10/12 Amdt 1 - Fuel Tanks","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\n# AD/TB10/12\n\nAmdt 1\n\nApplicability: Model TB9 and TB10.\n\n# Fuel Tanks 5/90\n\n \n\nRequirement: 1. Unless modified in accordance with Requirement 2, carry out following action:\n\n \n\n(a)     Position the aircraft in a wings level and a nose-down ground attitude of about 2 degrees.\n\n \n\nNote: This is achieved on level ground when the height from the ground to the spinner centre equals the height from the ground to the lower part of the rear mooring fitting.\n\n \n\n(b)     Leave the aircraft in this attitude for at least 20 minutes, then drain as described in (c) below; drain from each point at least 500 ml of fuel.\n\n \n\n(c)     Aircraft S/N to 730:\n\n \n\nDrain L.H wing fuel tank then R.H wing fuel tank. Aircraft S/N from 731:\n\n(i)       Select L.H fuel tank\n\n \n\n(ii)    Drain L.H wing fuel tank\n\n \n\n(iii)  Drain fuel filter under fuselage\n\n \n\n(iv)   Drain R.H wing fuel tank.\n\n \n\n(d)     Visually inspect fuel filler caps seal (broken, cracked, torn, kinked) and replace it if necessary.\n\n \n\nInstall caps and check security.\n\n \n\n2. Modify the fuel tanks in accordance with Socata TB Service Bulletin No. 48/1.\n\n \n\nNote: DGAC AD 89-177(A) R1 and Socata TB Service Bulletin No 48 refer.\n\n \n\nCompliance: 1. For aircraft which have not been flown for one week or more; prior to the next flight after 22 February 1990 and thereafter prior to the next flight any time a period of one week or more occurs between flights.\n\n \n\nFor aircraft which are flying at periods of less than one week between flights; within 25 hours time in service, after 22 February 1990, and thereafter at periods not exceeding 50 hours time in service.\n\n \n\n2. Prior to 28 February 1991.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\nNote: This Directive shall be entered on the Maintenance Release as maintenance required. The inspection required by Para 1 may be performed by the pilot in command, in which case certification is required. A copy of this Directive shall be carried in the aircraft.\n\n \n\nBackground:  This Airworthiness Directive is issued to reflect a Country of origin AD which requires regular inspections to detect any water/contamination in the fuel tanks until a modification is incorporated. This relocates the tank drain and outlet holes and reworks rib sections to ensure all drainable water/contamination collects at the tank drain point when the aircraft is in normal ground attitude.\n\n \n\nAmendment 1 is raised to introduce revisions to the manufacturers document, which clarifies aircraft nose down attitude, and the country of origin AD which increases the period between inspections.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment narrows and clarifies the original scope rather than expanding it — it refines the nose-down attitude specification and extends inspection intervals based on updated manufacturer and French aviation authority (DGAC) guidance. The core purpose (detecting water contamination until permanent modification) remains unchanged."},"complexity_factors":["Multiple compliance pathways based on aircraft usage patterns (flown regularly vs. infrequently)","Serial number-dependent procedural variations (S/N 730 and below vs. 731 and above)","Specific physical positioning requirements with measurement tolerances (2 degrees nose-down, 20-minute wait)","Precise volumetric requirements (500ml minimum drainage)","Dual compliance deadlines — one for inspections (ongoing) and one for permanent modification (fixed date)","Cross-references to external documents (DGAC AD 89-177(A) R1, Socata Service Bulletin 48/1)","Amendment structure requiring comparison with original to understand changes"],"plain_english_summary":"This CASA Airworthiness Directive mandates fuel-drain inspections and a specific draining procedure for Socata TB9 and TB10 (Tobago) aircraft (various serial-number rules), plus visual checks of fuel cap seals and a required tank modification by 28 Feb 1991. It targets owners/operators to detect and remove water contamination that could cause engine failure.\n\nPilots may perform and must log the drains; a copy of the AD must be kept aboard."},"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 does not expand the class of affected aircraft (still Socata TB9/TB10) but revises implementation details: it clarifies the required nose‑down ground attitude (how to measure ~2°) and adopts the country‑of‑origin AD revision that increases inspection intervals (moves some operators to an hours‑in‑service periodic inspection of up to 50 hours). The core obligations—regular draining/inspection until the service‑bulletin modification is incorporated and a mandatory modification by the specified date—remain in scope."},"complexity_factors":["Different compliance tracks depending on recent flight history (if not flown ≥1 week vs flown at intervals <1 week with an hours‑in‑service timetable).","Serial‑number dependent drain procedure (S/N to 730 versus S/N from 731) changes the sequence and adds a fuel filter drain.","Physical setup requirement: wings level with ~2° nose‑down attitude and a defined ground reference to achieve it.","Quantitative drain requirement (minimum 500 ml per drain point) and minimum attitude/dwell time (20 minutes) before draining.","Mandatory one‑off modification per Socata Service Bulletin No. 48/1 with a fixed compliance date.","Permits pilot‑performed inspections but requires certification on the Maintenance Release and carriage of the AD in the aircraft.","Notes and cross‑references to country‑of‑origin AD and manufacturer documents create reliance on external documents for full implementation."],"plain_english_summary":"This Airworthiness Directive requires regular draining and inspection of fuel tanks on Socata TB9 and TB10 aeroplanes and mandates a one‑off modification (Socata TB Service Bulletin No. 48/1) that relocates drain/outlet holes so water and contamination collect at the drain point. It specifies how to position the aircraft, the draining sequence (varies by serial number), and inspection of filler cap seals.\n\nOwners/operators pay for inspections and the modification. Pilots or maintenance personnel carry out and certify the inspections, and aircraft behaviour changes to routine pre‑flight or periodic draining until the modification is fitted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb10-12-amdt-1-fuel-tanks","history":"/api/acts/ad-tb10-12-amdt-1-fuel-tanks/history","analysis":"/api/acts/ad-tb10-12-amdt-1-fuel-tanks/analysis","conflicts":"/api/acts/ad-tb10-12-amdt-1-fuel-tanks/conflicts","importantCases":"/api/acts/ad-tb10-12-amdt-1-fuel-tanks/important-cases","documents":"/api/acts/ad-tb10-12-amdt-1-fuel-tanks/documents"}}