L-1011 Electrical System: Power Bus Distribution

Today Ian Grant asked me to see if I had information on which instrument or system would connect to which power bus in the L-1011. Here is the information for you Ian:

Loosing power in the L-1011 would not be an easy thing. All of the essential instruments can be powered form any bus including a number of standby busses. All in all, the following power busses are available:

1. AC Bus No.1 and Ground Service Bus
2. AC Bus No.2 and Radio Bus No.2
3. AC Bus No.3
4. Essential AC Bus and Essential Radio Bus
5. DC Bus No.1 and Ground Service Bus
6. DC Bus No.2 and Radio Bus No.2
7. DC Bus No.3
8. Essential Dc Bus and Essential DC Radio Bus
9. DC Standby Bus
10. AC Standby Bus
11. Battery Essential Communications and APU Battery Bus
12. Galley and Passenger Service Busses

All in all the L-1011 had a very sophisticated and fault tolerant power distribution system. However, you had an interest in which instrument is connect to which bus as its primary source of power. Below is a series of pictures that will give the exact data:

AC Bus No. 1 and Ground Service Bus

AC Bus No.2 and Radio Bus No.2

AC Bus No.3

Essential AC Bus and Essential Radio Bus

DC Bus No.1 and Ground Service Bus

DC Bus No.2 and Radio Bus No.2

DC Bus No.3

Essential DC Bus and Essential DC Radio Bus

DC Standby Bus

AC Standby Bus

Battery, Essential Communications and APU Battery Bus

Hope this helps. There is a lot more to the power distribution in the L-1011, however, I think this is a good start.