{"id":"F2006B11173","name":"AD/LTS/10 - Number Two Bearing","slug":"ad-lts-10-number-two-bearing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56871,"registerId":"commonwealth-F2006B11173-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LTS/10 - Number Two Bearing","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAlliedSignal (Lycoming) Turbine Engines \\- LTS 101 Series\n\nAD/LTS/10 Number Two Bearing 3/95\n\nApplicability: LTS101 series engines incorporating Number 2 Bearing P/N 4-301-362-01 as detailed by serial number in Textron Lycoming Alert Service Bulletin Number A-LT101-72- 50-0163 Revision 1.\n\nRequirement: Replace the number 2 bearing in accordance with Textron Lyoming Alert Service Bulletin No. A-LT101-72-50-0163 Revision 1.\n\nNote: FAA Airworthiness Directive 94-18-06 refers.\n\nCompliance: Effective 2 March 1995: As detailed in the Requirement Document.\n\nBackground: This Directive has been issued to require the replacement of certain number 2 bearings. The requirement follows advice that a machining discrepancy may have occurred during the manufacturing process. This discrepancy may result in bearing failure and subsequent engine failure.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose in the text: it targets LTS101 engines that have the specified Number 2 bearing and serial numbers, and it requires replacement via the named Textron Lycoming Alert Service Bulletin. The instrument does not show any expansion or narrowing beyond that stated applicability and requirement. (Applicability; Requirement; Background)"},"complexity_factors":["Narrow technical scope: single part (Number 2 bearing) on a defined engine series reduces legal and operational complexity (Applicability; Requirement).","Dependence on an external technical document: compliance requires following Textron Lycoming Alert Service Bulletin A-LT101-72-50-0163 Revision 1, adding procedural dependence outside the AD text (Requirement).","Serial-number specificity: operators must inspect serial-number listings in the Alert Service Bulletin to determine applicability, which adds a practical identification step (Applicability).","Operational logistics: replacement requires parts, qualified maintenance and scheduling, creating practical but not legal complexity (Requirement; Background).","Regulatory clarity: the AD is mandatory with a clear compliance date, so there is low legal ambiguity about obligations (Compliance; Header)."],"plain_english_summary":"This airworthiness directive mandates removal and replacement of the Number 2 bearing (P/N 4-301-362-01) in LTS101-series AlliedSignal/Lycoming engines whose serial numbers are listed in Textron Lycoming Alert Service Bulletin A‑LT101‑72‑50‑0163 Revision 1, following that bulletin’s procedures (effective 2 March 1995). It affects aircraft owners/operators and maintenance providers: the replacement is required because a machining discrepancy may cause bearing—and potentially engine—failure; owners/operators bear the cost and downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused on one specific mechanical defect. It has not expanded beyond its original purpose of addressing the bearing manufacturing discrepancy."},"complexity_factors":["Single, specific mechanical component targeted (Number 2 Bearing)","Only one substantive requirement: replace the bearing per manufacturer instructions","Limited applicability defined by specific part number and serial numbers","No nested exceptions or conditional logic","Cross-reference to only one external document (FAA AD 94-18-06) and one manufacturer bulletin","No defined terms section — technical terms are industry-standard","Total length: approximately 150 words"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft parts rather than cars.\n\n**What it does:** It orders owners and operators of specific AlliedSignal (Lycoming) LTS 101 turbine engines to replace a faulty component — the \"Number 2 Bearing\" (a critical part that helps the engine's rotating shaft spin smoothly).\n\n**Who it affects:** Anyone operating aircraft with LTS101 series engines that have a specific bearing part number (P/N 4-301-362-01). The exact engines are listed by serial number in a technical bulletin from the manufacturer.\n\n**Why it matters:** The bearing might have been machined incorrectly during manufacturing. If the bearing fails, the entire engine could fail — which in an aircraft means potential loss of power and possible crash. This directive forces the replacement before that can happen.\n\n**What must be done:** Replace the bearing following the manufacturer's instructions in Textron Lycoming Alert Service Bulletin A-LT101-72-50-0163 Revision 1.\n\n**When:** From 2 March 1995 onwards, following the timeline in the manufacturer's bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lts-10-number-two-bearing","history":"/api/acts/ad-lts-10-number-two-bearing/history","analysis":"/api/acts/ad-lts-10-number-two-bearing/analysis","conflicts":"/api/acts/ad-lts-10-number-two-bearing/conflicts","importantCases":"/api/acts/ad-lts-10-number-two-bearing/important-cases","documents":"/api/acts/ad-lts-10-number-two-bearing/documents"}}