Electrical

What are the different sources of electric power?

1 APU and 2 IDGs Integral Drive Generators, one external power.

What are the electrical specs for the APU and IDGs?

90KVA 115V and 400hz.

What use 400hz instead instead of 60 or 50 hz?

Good for short, not long, less weight and size.

What systems support the IDGs?

Own oil system and cooler. 6000rpm.

What cools the IDG oil?

Fuel heat exchangers and air heat exchanger.

What are wafer switchers?

Select for the display for AC and DC info.

What is powered even when BATT is off?

Hot Battery Bus.

What is powered when on the BATT is on?

Switched Hot BAT BUS, Battery Bus, DC standby bus, AC standby bus

What voltage and hz should all generators and gate power be at? What breaks the system when it is out of limits?

115V ac +-5. 400hz CPS Generator Control Breaker

What do the Transformer Rectifiers output in volts and amps?

28V dc, 75 amps each.

What is the auto shed feature?

Galley are dropped when only on APU.

How many ERs are there?

3

How do the BATT and AUX BATT CHRG work?

TRs, but only for batts, not for system.

What is the main purpose of the AC standby bus?

Right ignitors are powered.

What is the biggest consideration with IDG disconnects?

Once disconnected, do not reconnect in flight.

What batteries do the 737 have, and what do they power?

NiCad, backup 30min AC+DC