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Warning System (EGPWS) <0025> CB Panel Integral Lights
<0040> Flight Recorder Power ARINC Display Fan, Galley and Cabin Fan Inertial Reference System (1) <0025>
Hydraulic System Fan Flap Power Drive Unit (2) Head-
up Guidance System
Display Cooling Fan (R) ADG Deploy Sensor <0026>
Exhaust and Cockpit Fan TRU 2, DC Essential bus Traffic Alert and Collision
Flap Power Drive Unit (1) Avoidance (TCAS)
Engine Vibration Monitor ARINC Chassis and Display
ADG Deploy Sensor Cooling Fans (L)
TRU 1, DC essential bus Essential TRU 1
AC UTILITY BUS AC UTILITY BUS AC SERVICE ADG Bus
1 2 BUS
Galley (1) and Coffee Maker Main Battery Chargerg Power Sensing Relay Galley (2) and Water Systemy APU Battery Chargerg Power Sensing Relay Service TRU Vacuum CleanerVacuum Cleaner Toilet Motor/pumpMotor/pump Hydraulic Pump 3B Fla sFlap
s
Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL AC Electrical System Vol. 1 07-
20-
12
REV 56, Jan 31/03
In the event of a complete ACpowerfailure in flight, the ADGwill automaticallydeploy andsupply115-
volts, 400Hz ACemergencypower totheADGbus. TheADG generatoris rated at15KVA. TheADGbuswillthen supply emergencypowertothe AC essentialbus andthe 3Bhydraulicpump. The ACessentialbus willthen power essentialTRU1, whichwillpower the DC essentialbus.
Iftheautomatic deployfunction fails, theADG can bedeployed manuallybypullingthe ADG manual release handle on theADGCONTROL controlpanelatthe rearofthe centerconsole.
Ifeithermain generatoris restored,the crewcan overridetheADGbypressingthe PWRTXFROVERRIDEbutton on theADG controlpanel. This willreconnectthe restoredIDGto power ACbus 1, ACbus 2andthe AC essentialbus. The ADGwill continue to power the criticalflight controls andthe ADGbus. The flaps willmove at half speed whenpoweredfrom theADGbus.
The ADGgenerator, voltage,frequencyandADGbusindications on theEICAS,AC ELECTRICAL synoptic page are onlydisplayed whentheADGbusis powered.
The ADGwill continue to operateand supplypowertotheADGbusuntilthe airspeed decreases belowapproximately100kts. Atthatpoint,iftheAPUgenerator orIDGhas notbeen restored,theonlypower available willbe from the batteries.
The ADG cannotbe restowedin flight. Itis restowed manually, on theground,by maintenance personnel.
NOTE
After ADG deployment or APU generator switching, intermittent failure of the pilot’s and copilot’s air data systems may occur. These failures may result in uncommandedchangestothepilot’sorcopilot’sflight instruments.Thebarometricaltimetersetting,altitude preselector,V-
speedsandspeedbugsettingsshould becheckedand reset as required.
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