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

• Class 2, or faults that did not have a direct effect on the operation of the flightbut may have had an effect if there was a subsequent fault. They wereaccompanied by one or more ‘MAINTENANCE STATUS’ messages that wereonly brought to the attention of the flight crew via the ECAM’s ‘status’ pageonce on the ground.• Class 3, or faults that had no effect on the operation of the aircraft and were notindicated to the flight crew. These messages were therefore not included in thePFR, but could be found by interrogating a system’s BITE data.The three failure levels used by the FWS were not the same as the three failureclasses used by the CMS. The relationship between failure levels and failure classeswas based on the operational consequences of the fault, as shown in Table 5.Table 5: Relationship between failure classes and failure levelsOperational consequence for the flight Failure class (CMS) Failure level (FWS)May have consequences Class 1 Level 3Level 2Level 1No consequences Class 2Class 3Nil1.6.11 Electronic centralized aircraft monitor (ECAM)System overviewThe electronic centralized aircraft monitor (ECAM) provided the flight crew withinformation on the status of the aircraft and its systems, including any system faults.It also displayed the required flight crew actions for most normal, abnormal andemergency situations. Overall, it was a very important tool for enabling the flightcrew to identify, diagnose and respond to system faults.The ECAM provided its information on two display units that were located in thecentre of the instrument panel (Figure 10):• The upper unit, or engine/warning display (E/WD), presented information suchas engine primary indications, fuel quantity information and slats/flap positions.The bottom part of the E/WD presented warning or caution messages when asystem fault occurred and memo messages when there were no faults. Arepresentation of the ECAM’s E/WD display during takeoff is shown inFigure 17.• The lower unit, or system display (SD), presented synoptic information fordifferent systems. In some cases, the ECAM would automatically provide therelevant system’s information following a system fault. The flight crew couldalso select different system pages. In addition, the SD could present a ‘statuspage’, which provided an operational summary of the aircraft status, including alist of inoperative systems, cancelled cautions, approach procedures andlimitations (such as speed).- 27 -