Crj Q

[paulsalem]

According to Bombardier they are the same system. Just like the packs and generators.

Things that make you go hmmm.

The gens are bigger, and the packs have to be bigger. Ahh feel that cool air!

 

[Stifler's Mom]

According to Bombardier they are the same system. Just like the packs and generators.

Things that make you go hmmm.

I've wondered why in the 50 you have to turn the packs off to start an engine, but in the 70 you don't. Hmmmmmm.

 

[bailout]

you dont have to in the 50 either. It will do it automatically. The checklist design theory however, is to match switch position.

 

[Stifler's Mom]

you dont have to in the 50 either. It will do it automatically. The checklist design theory however, is to match switch position.

I guess that's what I was referring to. The two cheklists vary between the airplanes. Atleast at ASA, not sure about other airlines.

 

[John Pennekamp]

It doesn't matter how you position the switches, the computer does its own thing during any engine starts.

Also, I know the training department disagrees, but it doesn't matter which order you push the switches when transferring from APU to 10th stage and back. The computer opens and closes them in the proper sequence automatically, no matter which order you actually push the switches. The asinine 1-2-4-3 order is "in case the computer screws up".

 

[nethan]

..."in case the computer screws up".

I always found that so comforting. What else might the computer screw up?

 

[John Pennekamp]

I always found that so comforting. What else might the computer screw up?

Seriously...

 

[mynameisjim]

And if the computer is screwing up, who is to say it will honor the order in which you selected the switches?

 

[John Pennekamp]

And if the computer is screwing up, who is to say it will honor the order in which you selected the switches?

Physics. Air flows from high pressure to low pressure on its own.

 

[mynameisjim]

Physics. Air flows from high pressure to low pressure on its own.

That's not what I meant. What I meant was we are asking for a position of a valve, and the computer determines whether to move it or not. If the computer is broken, who knows what it might do. We don't control valve position, we only ask for one.