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Printed page xvii. PDF page 19.
atmospheric particle striking one of the integrated circuits within the CPU module. There was insufficient evidence available to determine if an SEE was involved, but the investigation identified SEE as an ongoing risk for airborne equipment. The LTN-101 had built-inOpen official document at PDF page 19ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 129. PDF page 149.
before the ARINC 429 messages were queued in the CPU module's output buffer. There was insufficient evidence to determine the origin of the IR spikes, although there was no evidence to suggest that they were generated in a differentOpen official document at PDF page 149ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 199. PDF page 219.
considered a benign failure mode since all data output from the ADIRU had ceased. There was insufficient evidence to determine whether any common contributing factors were involved in producing the two failure modes. - 199 -Open official document at PDF page 219ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 203. PDF page 223.
triggers were probably not associated with the data-spike failure mode. However, there was insufficient evidence available to determine whether SEE could have triggered the failure mode. With the decreasing size of electronic devices, there is an increased risk of SEEsOpen official document at PDF page 223ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 150. PDF page 170.
bug. Very unlikely environment Extensive unit and module testing found no problems. Insufficient EMI from Visual examination of the units did not identify any physical evidence to aircraft damage or other abnormalities. estimate systems Not consistent with a ‘soft faulOpen official document at PDF page 170ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008