737NG question

[Topspin]

Hi,

I am working on PPL right now but want to do something fun, so next week I am going to book this: http://flightadventures.ca/packages.php ... individual

Trying to learn as much as possible before I get in there and my question is;

The main DC bus, is it only possible to run off of 1 GEN, as it appears on the switch? Most airline simulations I have seen have both GEN's operating independently.
Also why are there two APU GEN switches?

Very thankfull for any help or links to sources of Info.

TS

[Four1oh]

the electrical system is basically split symmetrically between left and right. Left Gen powers Left side, and Right Gen powers right side. in the case of a gen failure, the other can power both sides, with the unessential loads shed to reduce the demand on the remaining Gen. The APU also runs it's own gen that can be started anytime in flight to fill in for the failed gen. So, having said that, there's 2 APU GEN switches so that on the ground, with the engines off, the APU can be selected to power both 'sides', and in the air, you can select which side to power in the case you have a main Gen failure. Hope that helps.

[Norfolk]

Yes it's possible to run the entire elec system off one GEN. (not sure if that answers your question). The reason for the two APU GEN switchs are because each one powers its related AC transfer bus (not DC like you mentioned). One switch can power both AC Transfer buses through BTB's- Bus Tie Breakers. The system has 3 TRU's that convert AC power to DC. Hope that helps. Have fun eh.

[Topspin]

Thanks for the fast response.

Helps to understand the system, but I guess my question would be;

On the electrical panel DC side, the rotary switch can only be in GEN1 or GEN2 at one time. This makes me think what is the point of having the option if the bus is being powered from both GENS at the same time?

[Hey You There]

What you are looking at (rotary switch) is just a fancy volt meter to see what your selected Gen etc. is doing.

[Topspin]

wow, "smacks head"

Thinking about it that way it is so easy and simple. Thanks folks.