3.4 OVERHEAD PANEL
3.4.1 ELECTRICAL
The E-Jet electrical system is fully automated and under normal
operations, no pilot action is required. Two electrical networks
work independently from one another for electrical fault isolation
purposes. In the event of a power source fault, bus ties
automatically connect between the networks with no significant
operational or workload needed. Battery 2, specifically has an
"off/auto" indication on the knob because only BAT 2 connects to the
APU start bus. So when the APU is selected to run, BAT 2 is taken
offline to start the apu.
The Alternating Current (AC) system is composed of:
● 2 Integrated Drive Generators (IDGs)
● 1 Auxiliary Power Unit (APU) generator
● 1 Ram Air Turbine (RAT)
● 1 AC external power unit or Ground Power Unit (This will
light up when the GPU is on)
The Direct Current (DC) system is composed of:
● 2 Nickel Cadmium (NiCd) batteries
● 3 Transformer Rectifier Units (TRUs)
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