Altimeter Altimeter 1 Altimeter 2 Analog-Alt- DA1-Alt-Signal DA2 50.2500)wr G过m○m Altitude Switch SUPERVISORY INFERRED SYSTEM STATE MODE Dig-Alt2 ockpit Control Invalid DOl-Power-On Device Fault OPERATING hibit (On, Offy Indicator MODES Aircraft Altitude Dig-Alt1 Lamp eset T, FI At-or-above-threshold Cannot-be-determined Not inhibited DOl-Status DOI-status-signal Unknow Fault-detected Watchdog timerOPERATING MODES Operational Fault Detected Startup Inhibited Not Inhibited Watchdog Timer SUPERVISORY MODE Cockpit Controls Altimeter 1 Digital Altimeter Analog Watchdog-Strobe {High} Altitude Switch Analog-Alt-Status Analog-Alt-Signal DA1-Status-Signal DA2-Status-Signal {Fail,NCD,Test,Norm} {Below,Above} {Invalid,Valid} {-50..2500} DA2-Alt-Signal INT {Fail,NCD,Test,Norm} (DOI) Interest of Device Digital Altimeter 2 DA1-Alt-Signal {-50..2500} INT DOI-Power-On {High} DOI-status-signal {On, Off} Cockpit Fault Indicator Lamp On Off Inhibit {On,Off} Reset {T,F} INFERRED SYSTEM STATE DOI-Status On Off Unknown Fault-detected Unknown Cannot-be-determined Below-threshold At-or-above-threshold Aircraft Altitude Valid Invalid Unknown Dig-Alt1 Valid Unknown Invalid Analog-Alt Valid Invalid Unknown Dig-Alt2 ￾➢Ý