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Printed page label not indexed. PDF page 9.
hardware component. There were only three known occasions of the failure mode in over 128 million hours of unit operation. At the aircraft manufacturer's request, the ADIRU manufacturer has modified the LTN-101 ADIRU to improve its ability to detect dataOpen official document at PDF page 9ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page xvii. PDF page 19.
the air data parameters. The failure mode has only been observed three times in over 128 million hours of unit operation, and the unit met the aircraft manufacturer's specifications for reliability and undetected failure rates. Without knowing the exact failureOpen official document at PDF page 19ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 109. PDF page 129.
to about 44% of the A330/A340 fleet. As of April 2010, LTN-101 units had accrued over 128 million hours of operation, including 113 million hours in Airbus aircraft. Over 8,000 units had been manufactured by July 2010, and the unitsOpen official document at PDF page 129ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 160. PDF page 180.
three known data-spike occurrences on LTN-101 ADIRUs, and the model had accrued over 128 million hours of operation.178 176 The storage capacity for routine BITE messages was limited, and the effects of a dozing event on the BITE would beOpen official document at PDF page 180ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 200. PDF page 220.
in certification requirements), having only been observed on three occasions in over 128 million hours of unit operation. The LTN-101 ADIRU therefore met the relevant reliability requirements in terms of mean time between failures (MTBF), and it appeared to meetOpen official document at PDF page 220ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 215. PDF page 235.
April 2010, the LTN-101 air data inertial reference unit (ADIRU) had accumulated over 128 million hours of operation. The data-spike failure mode had only been observed on three occasions. The ADIRU's in-service performance met the aircraft manufacturer's safety and reliOpen official document at PDF page 235ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008