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xxA Between 3 and 99 amp Less than 3 amp or more than 99 amp Invalid data
EICAS OUTLINE GREEN WHITE AMBER HALF-
INTENSITY MAGENTA
V A TRU1 TRU 1 18 VDCorgreater Less than 18 VDC _ Invalid data
V A TRU2 TRU 2 18 VDCorgreater Less than 18 VDC _ Invalid data
SERV TRU2 V A Service TRU 18 VDCorgreater Load more than 2amp Less than 18 VDC Load less than 2amp _ Invalid data
Ess TRU2 V A Essential TRU 2 18 VDCorgreater Load more than 3amp Less than 18 VDC Load less than 3amp TRU failure Invalid data
Ess TRU1 V A Essential TRU 1 18 VDCorgreater Load more than 3amp Less than 18 VDC Load less than 3amp TRU failure Invalid data
Transformer Rectifier Units
Figure 07---20---6
Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL Vol. 1 07-
20-
11
AC Electrical System REV 56, Jan 31/03
The AC essentialbusis normallypoweredbyACbus1. If a fault exists on AC bus 1, the GCU will automatically transfer the power supplied to the AC essential bus, from AC bus 1 to AC bus 2. The crew can also manuallytransferthe AC essential bus supply power, from AC bus 1 to AC bus 2, using the AC ESS XFER switchlight on the electrical panel. In flight,theAC service busis normallypoweredfrom ACbus2.Ontheground, it can be powered from theAPUgenerator orfrom externalACpower.
The AC service bussupplies power tothose circuits necessaryforground-
servicing operations, withouthavingto power theentire electricalsystem.
The AC utilitybuses are normallypowered(infull configuration)bytheir respective AC bus. In flight, the AC utilitybuses are automaticallySHEDif only one generatoris operational. In service configuration,theAC utilitybuses are poweredfrom either the APUgenerator orfrom externalACpower.
D. AC Loads Distribution E. Air Driven Generator (ADG)
AC BUS 1 AC BUS 2 AC ESSENTIAL
Hydraulic Pumps 2B and 3B HSTA (Ch-
1) HSTA (Ch-
2)
Left Windshield Heater Hydraulic Pumps 3A and 1B Bleed Leak Controllers (L / R)
Probe Heaters (R) (AOA and Right Windshield Heaters Left Window Heater
Pitot) and TAT Right Window Heater Probe Heaters (L) (AOA and
Left -
Navigation, Landing and Ice Detector 2 Pitot)
Taxi Lights Instrument Lights (copilot and Ice Detector 1
Ground Proximity Warning overhead), Landing and Taxi Engine Ignition A
System (GPWS) Lights (R) Instrument Lights (Pilot’s and
Enhanced Ground Proximity Inertial Reference System (2) Center)
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