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Printed page 215. PDF page 235.
manufacturer's safety and reliability objectives. Air data inertial reference unit (ADIRU) 2 and ADIRU 3 operated normally throughout the flight. Although air data inertial reference unit 1 transmitted a significant amount of incorrect data on inertial reference parOpen official document at PDF page 235ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 109. PDF page 129.
information from the 7 October 2008 flight showed that air data 3.1.1 inertial reference unit (ADIRU) 1 (unit 4167) provided some incorrect flight data to the aircraft's other systems. This included data spikes on air data reference (ADR) 3.1.2 parametersOpen official document at PDF page 129ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 227. PDF page 247.
(FDR) and quick access recorder (QAR) obtained data on air data inertial reference unit (ADIRU) parameters through independent signal paths, as shown in Figure B1. Figure B1: Signal paths for the FDR and QAR systems - 227 -Open official document at PDF page 247ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 235. PDF page 255.
aircraft was in cruise at FL410, there was a failure of air data inertial reference unit (ADIRU) 1. The ADIRU was the same unit (serial number 4167) as on the 7 October 2008 flight. The operator's maintenance watch log recordedOpen official document at PDF page 255ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 243. PDF page 263.
development Following the 7 October 2008 occurrence, air data inertial reference unit (ADIRU) 1 (unit 4167) was removed from VH-QPA at Learmonth, prior to downloading any data or functional testing of other units on the aircraft. ADIRU 2 (unit 4687)Open official document at PDF page 263ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 253. PDF page 273.
characterise the electromagnetic environment around air data inertial reference unit (ADIRU) 1 during normal operation and in relative proximity to potential sources of electromagnetic interference (EMI).214 Measurements included the following:215 ‘Conducted' bulk curOpen official document at PDF page 273ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008