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W Whenthe airplane is -
200feetbelow selectedaltitudetheflashing magentabugs andreadoutwill cancel.
W Ifthe airplane subsequently continues todeviate (±1000feet)fromthe selected altitude, aonesecondtonewillbe heard.
W Whenthe airplane is again within 200feetofthe selected altitude,the readoutand bugswillturn magentaand stopflashing.
Altitudealerts can be cancelledbypushingtheALT switch orselecting adifferent altitude. Altitudealerts are inhibitediftheglideslopeis captured.
Altitude Alert System
Figure 03---20---6
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AFCS MSG FAIL Warning (red)
Comes ontoindicate thepresenceof an invalidflight control system (FCS) message.
FD 1 or 2 FAIL status (white)
Indicates that the respective flightdirector has failed.
IAPS DEGRADED status (white)
Indicates that anIAPS bus has failed.
<0039>
IAPS OVERTEMP status (white)
Indicates that anIAPS overtemperature condition has beendetected.
<0039>
SPEED REFS INDEP
Status (white)
Comes ontoindicate
that the pilot’s and
copilot’s V-
speed
selections are not
synchronized.
Automatic Flight Control System EICAS Indications <MST>
Figure 03---20---7
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G. System Circuit Breakers
SYSTEM SUB-
SYSTEM CB NAME BUS BAR CB PANEL CB LOCATION NOTES
Integrated AvionicsAvionics Left AFCS IAPS LEFT AFCS DC BAT 2 P7
Processor System Right AFCS IAPS RIGHT AFCS DC BUS 2 2 H3
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1. AUTOPILOT
The automaticflight controlsystem(AFCS)provides atwo axes, digital, fail-passive autopilot (AP). The APsystemautomatically controlsthe aircraftin the pitch, roll andyaw axis,in response to flightdirector commands, by actuatingtheappropriate control surfaces. The fail-passive APsystemis protectedagainstinternalsingle hardware faultsandlimits any malfunctioning commandsto aresponse thatis easily controlledbythepilot. Command inputsto theailerons andelevators are providedby servos controlledbytheflight control computers (FCC’s). TheFCC’s inputthe yaw dampersystemtocontrolthe rudder
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