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

In addition to these two caution messages, the PFR also recorded a series ofmaintenance faults associated with ADIRU 1 as follows:• IR 1 class 2 fault (at 0440): this fault was detected and reported by ADIRU 1.• ADR 1 class 2 fault (at 0440): this fault was detected and reported by ADIRU 1and probably associated with some ADR data not being refreshed at a sufficientrate (section 3.7.3).• ADIRU 1 class 1 fault (at 0440): this message was reported by the FMGES,EFCS, FWS, DMC 1 and ground proximity warning system (GPWS).Subsequent maintenance fault messages associated with ADIRU 1 were detected bythe EFCS at 0452, 0455 and 0500, the IR part of ADIRU 3 at 0506 and 0513, andthe landing gear control interface units (LGCIUs) at 0531.The PFR showed no recorded faults for ADIRU 2 or ADIRU 3.EFCS fault messagesThe PFR recorded four caution messages that were associated with the operation ofthe EFCS, as shown in Table 10. Further explanation of these messages is providedin section 2.2.2.Table 10: PFR cockpit effect messages for EFCSTime Cockpit effect message Interpretation0442 F/CTL PRIM 1 PITCH FAULT The independent command and monitorchannels of FCPC 1 detected a discrepancybetween the actual and commanded elevatorposition.0442 F/CTL PRIM 3 FAULT A discrepancy was detected between the controlorders that were independently computed by thecommand and monitor channels of FCPC 3.[Note. FDR data showed that a second F/CTLPRIM 3 FAULT occurred at 0445.]0445 F/CTL PRIM 2 PITCH FAULT The independent command and monitorchannels of FCPC 2 detected a discrepancybetween the actual and commanded elevatorposition.0445 F/CTL ALTN LAW Due to multiple FCPC faults, the EFCS controllaw reverted from normal to alternate law.The PFR also recorded class 1 maintenance fault messages associated with the twopitch faults at 0442 and 0445.Other cockpit effect messagesSeveral of the cockpit effect messages on the PFR were attributable to ADIRU 1providing incorrect or insufficient output data (see Table 11).- 47 -