CRJ200 Quicktips – Electrical System – General
Posted by Jeffrey on November 11th, 2008
The Electrical 
System supplies both 115 VAC and 28 VDC power to the airplane systems.
There are two batteries which are 24V and receive a charge from the 28V system.
Three (3) Hot Buses:
- APU BATT DIR BUS
- BATT DIR BUS
- DC EMER BUS [DC EMER BUS is only shown if one power source is lost]
The five (5) minute limitation on DC ground power is only for ED1 and ED2 since they are powered by the battery, but cooled from AC electrical power.
When airplane is in AC SERV configuration, you must still observe the 5 minute ground limit for DC power only. Or we can press the “AC IN USE” button in the cockpit to power AC buses for the MFD cooling if AC power is connected.
Note: DC Power is vary rarely ever used.
If you would like to know more about this system, The CRJ Quicknotes Study Guide, is available for download now. Just click here and you can be learning about the CRJ200 in just a few minutes.
Jeffrey is a captain at a regional airline and flies the CRJ200, CRJ700, and the CRJ900. He has over 4000 hrs of flying experience in many different airplanes and is a Gold Seal flight instructor to his credit. He has recently written “The CRJ200 Quicknote Study Guide” that simplifies the systems of the CRJ200 into a easy-to-understand, downloadable eBook. Click here to get your copy today!
