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Printed page label not indexed. PDF page 5.
Rolls-Royce also released an engine control software update that included an IP turbine overspeed protection system (IPTOS) that is designed to shut the engine down before the turbine disc can overspeed, in the unlikely event that a similar failure occurs.Open official document at PDF page 5ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010
Printed page label not indexed. PDF page 19.
Intermediate pressure stage 8 IPT Integrated Programme Team IPTOS Intermediate pressure turbine overspeed protection system ISO International Organisation for Standardisation JAR Joint Aviation Requirements JAR-E Joint Aviation Requirements - Engines kN Kilonewton kPa Kilopascal LOpen official document at PDF page 19ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010
Printed page 51. PDF page 71.
provided a number of overspeed protections to minimise the risk of such an event. The LP overspeed protection system provides two protection functions, against LP rotor assembly overspeed and LP turbine overspeed. LP rotor assembly speed, or N1, is measuredOpen official document at PDF page 71ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010
Printed page 52. PDF page 72.
any overspeed of the unrestrained LP turbine would be limited. The IP rotor assembly overspeed protection system has speed sensors at the compressor end of the IP turbine shaft. It operates in a similar manner to the LP rotor assemblyOpen official document at PDF page 72ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010
Printed page 67. PDF page 87.
accident, the engine manufacturer developed a Trent 900 intermediate pressure turbine overspeed protection system (IPTOS). It was enabled through a modification to the FADEC software and was designed to limit the available energy and prevent the IP turbine from reachingOpen official document at PDF page 87ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010
Printed page 151. PDF page 171.
introduction of a revised standard of engine management software that featured an IP turbine overspeed protection system (IPTOS). The IPTOS was intended to detect engine conditions with the potential to lead to an IP turbine over speed. In response, IPTOSOpen official document at PDF page 171ATSB AO-2010-089: In-flight uncontained engine failure, Airbus A380-842 VH-OQA, overhead Batam Island, 4 November 2010