In-flight upset - 154 km west of Learmonth, WA, 7 October 2008,

Table 1: Examples of ADIRU flight data parametersOutput frequency(times per second)RecordingsystemsAir data parametersStandard altitude 27 16 FDR, QARAltitude rate 16 Not recordedComputed airspeed 8 FDR, QARTrue airspeed 8 Not recordedMach 8 FDR, QARCorrected AOA 16 FDR, QARIndicated AOA 16 Not recordedStatic air temperature 2 FDR, QARTotal air temperature 2 QARTotal air pressure 8 Not recordedInertial reference parametersPitch attitude (angle) 50 FDR, QARPitch rate 50 Not recordedPitch acceleration 50 Not recordedRoll attitude (angle) 50 FDR, QARRoll rate 50 Not recordedRoll acceleration 50 Not recordedFlightpath angle 25 QARFlightpath acceleration 50 QARGroundspeed 25 FDR, QARMagnetic heading 25 FDR, QARWind speed 10 FDR, QARWind direction 10 FDR, QARInertial latitude 5 Not recordedInertial longitude 5 Not recordedThe ADIRUs’ outputs were transmitted to several other aircraft systems, includingthe flight displays, autopilot, and EFCS. All three ADIRUs provided data to each ofthe FCPCs.The overall structure of the ADIRS is summarised in Figure 8. More detailedinformation on the ADIRU architecture is provided in section 3.2.27The ADIRU outputted several different altitude parameters, including standard altitude (referredto as ‘altitude’ in this report). The other parameters are discussed in section 3.3.4.- 14 -