What turns on when you activate Ground Power

[uberwolfe 0]

Hi all,

 

I am just wondering what systems activate when you first enable ground power from a cold 'n dark cockpit?

 

There seems to be a lot of noise in the cockpit with the engines, APU, packs/fans, pumps etc all turned off...

 

Just curious is all. Is it really like this in the real 737? Would love to know. Thanks

[KriVa 307]

Avionics cooling mostly... And yes, they really do need that much cooling ;-)

 

 

Sent from my iPad using Tapatalk

[scandinavian13 5,192]

 

 

Just curious is all. Is it really like this in the real 737?

 

As Thomas mentioned, it's a lot of avionics cooling and any other ventilation systems you've left on from the previous flight/crew.  Of note are the recirc fans.  Those actually make a ton of noise (they're switched with one or two switches at the top of the aircon panel).  One trick from the real world is to switch the right (I think it's the right one - going off of memory here) recirc fans off.  That'll cut the noise a ton.

[Spin737 102]

Recircs and the stby alt vibrator, if she's got one. The plane that is.

[scandinavian13 5,192]

 

 

The plane that is.

 

haha - thanks for that!

[serviceceiling 135]

Haha, Matt - good one!  :lol:

[ahsmatt7 1,199]

Didn't I already answer this for you? Just Checking if I did or not. Sounds very familiar.

 

As i said before. When you select the GPU as the power source. The entire electrical system is pretty much powered up. The GPU energizes both AC transfer busses 1 and 2 through the tie bus and bus tie breakers. Then each main bus and galley bus associated with the individual AC transfer busses 1 and 2 get energized. The ground service busses also get energized which allow the battery to be charged.

[uberwolfe 0]

Didn't I already answer this for you? Just Checking if I did or not. Sounds very familiar.

 

As i said before. When you select the GPU as the power source. The entire electrical system is pretty much powered up. The GPU energizes both AC transfer busses 1 and 2 through the tie bus and bus tie breakers. Then each main bus and galley bus associated with the individual AC transfer busses 1 and 2 get energized. The ground service busses also get energized which allow the battery to be charged.

 

Yes you did answer this already, thanks. There were server issues when I made the original post and this was duplicated about 11 times..!