{"id":"F2006B11186","name":"AD/LTS/9 Amdt 2 - Number 3 and 4 Bearing Monitoring","slug":"ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56890,"registerId":"commonwealth-F2006B11186-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LTS/9 Amdt 2 - Number 3 and 4 Bearing Monitoring","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/9\n\nAmdt 2\n\n  \nNumber 3 and 4 Bearing Monitoring 9/96\n\nApplicability: All LTS101 series engines not incorporating the requirements of CAO 106, AD/LTS/13.\n\nRequirement: Monitor the condition of the number 3 and 4 bearings in accordance with the technical procedures detailed in FAA Airworthiness Directive 88-14-01, Paragraphs\n\n(a) through (j).\n\nNote: AlliedSignal (Formerly Textron Lycoming) Service Bulletins LT 101-72-40- 0103 Revision 3 and LT 101-77-30-0104 Revision 3 refer.\n\nCompliance: Unless previously accomplished; as detailed in the requirement document with a revised effectivity date of 15 August 1996.\n\nBackground: The original issue of this Directive was issued to require the monitoring of the number 3 and 4 bearings for evidence of failure following advice of power turbine failure events. The requirement reflected FAA AD 87-26-10.\n\nAmendment 1 was issued to reflect FAA AD 88-14-01 superseded the requirements of FAA AD 87-26-10. AD 88-14-01 alleviated the inspection and maintenance requirements of AD 87-26-10 and introduced alternate maintenance procedures.\n\nThis amendment introduces a terminating action. The requirements of this Directive are no longer applicable to engines incorporating the improved rotor retention capability and improved electronic power turbine rotor overspeed controller detailed in CAO 106, AD/LTS/13.\n\nThe original issue of this Airworthiness Directive became effective on 24 March 1988.\n\nAmendment 1 of this Airworthiness Directive became effective on 6 October 1988.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1853},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment narrows the scope by introducing a terminating action. The monitoring requirements no longer apply to engines that incorporate improved rotor retention capabilities and improved electronic power turbine rotor overspeed controllers (as detailed in CAO 106, AD/LTS/13), effectively exempting upgraded engines from the ongoing bearing monitoring obligations that applied to the original directive."},"complexity_factors":["Requires cross-referencing external technical documents (FAA Airworthiness Directive 88-14-01 and AlliedSignal Service Bulletins) that are not reproduced in the text","Conditional applicability creates a negative exclusion (applies to all engines NOT incorporating requirements of other directives)","Amendment introduces terminating action that creates an exception to the ongoing compliance obligation","Technical terminology assumes familiarity with aviation maintenance concepts (bearing monitoring, power turbine, rotor retention)"],"plain_english_summary":"This amendment requires operators of AlliedSignal/Lycoming LTS101 turbine engines to perform recurring inspections of the No. 3 and No. 4 bearings to detect deterioration and prevent power-turbine failures, unless the engine has been modified with improved rotor retention and an improved electronic overspeed controller. Engines fitted with those specified upgrades are exempt from the ongoing monitoring requirement, removing the inspection burden where the hardware provides equivalent safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring","history":"/api/acts/ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring/history","analysis":"/api/acts/ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring/analysis","conflicts":"/api/acts/ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring/conflicts","importantCases":"/api/acts/ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring/important-cases","documents":"/api/acts/ad-lts-9-amdt-2-number-3-and-4-bearing-monitoring/documents"}}