tuhlhorn
Topic Author
Posts: 14
Joined: Mon Aug 13, 2007 12:43 pm

### CRJ 200 Hydraulics

I was recently hired by PSA flying the CRJ 200 and 700 and I am studying hard for the month of November, as I start training in December. I am currently studying the hydraulic system and I have found something that seems weird and I am trying to find out "WHY" this happens.

why does pump 2b shed automatically if the left engine fails and pump 1b sheds automatically if right engine fails?

I think I said that correct, I dont have a whole lot of resources so I am trying to work with what I have for now. The only explanation I could think of but doesnt sound all that correct to me is pump b will shed on the good engine so that the hydraulic pressure will remain equal on both sides (1 pump per side)?

Any info on this or anything else that will help me with this would be greatly appreciated.

2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

### RE: CRJ 200 Hydraulics

 Quoting Tuhlhorn (Thread starter):I was recently hired by PSA flying the CRJ 200 and 700

Congratulations....keep us posted on your progress!

2H4
Intentionally Left Blank

Jetlagged
Posts: 2564
Joined: Sun Jan 23, 2005 3:00 pm

### RE: CRJ 200 Hydraulics

Pump 1B is powered by AC bus 2 and Pump 2B by AC bus 1. I would guess it is more to do with electrical load shedding with an engine out rather than evening out hydraulic systems.

It makes sense that the electrically driven hyd pump is powered by the opposite engines IDG, so that an engine failure would not potentially take out all that sides hydraulic pressure.

Is it not the case that if you switch either pump 1B or 2B to ON it will run regardless of whether an engine has failed. It is only in the AUTO position that the pump won't run.

Hydraulic pressure will be the same with one pump or two. However, the maximum flow available will be reduced with only one pump.

[Edited 2007-11-01 15:29:01]
The glass isn't half empty, or half full, it's twice as big as it needs to be.

Posts: 4662
Joined: Thu May 26, 2005 10:19 am

### RE: CRJ 200 Hydraulics

 Quoting Tuhlhorn (Thread starter):I was recently hired by PSA flying the CRJ 200 and 700

As someone living in DAY and tempted by PSA's new qualifications of just Commercial, multi, instrument, do you mind if I ask you how many hours you had before getting hired? I don't want to spend the \$20k or so to push ahead with the rest of the ratings if their commercial/multi/instrument only mins are just an advertisement but in reality you still need the 1000 + 100.

nucsh
Posts: 181
Joined: Mon Apr 26, 2004 12:29 am

### RE: CRJ 200 Hydraulics

There are some regionals hiring at just 500 + 50 (ASA being one of them)
If landing is about "kissing" the ground, you just about raped it.

DeltaGuy
Posts: 3965
Joined: Wed Sep 12, 2001 5:25 am

### RE: CRJ 200 Hydraulics

I think the new ones are Comm/Multi and a pulse, no joke....the time is now for a job, abiet a badly paid one, but jet time none the less.

DeltaGuy
"The cockpit, what is it?" "It's the little room in the front of the plane where the pilot sits, but that's not importan

n710ps
Posts: 1117
Joined: Tue Oct 10, 2006 7:09 am

### RE: CRJ 200 Hydraulics

Welcome aboard!!!! Do't let the old timers get you down. There are some real egos in the left seat. Try to have fun and have fun man. See you around sometime. P.S. It is for electrical load shedding purposes. Jetlagged got it pretty much correct.

Again, good luck!
There is plenty of room for Gods animals, right next to the mashed potatoes!

freshlove1
Posts: 1245
Joined: Thu Jan 15, 2004 1:38 pm

### RE: CRJ 200 Hydraulics

 Quoting N710PS (Reply 6):Welcome aboard!!!! Do't let the old timers get you down

The old Dornier 328 guys and quite possibly some J-31 guys from really back in the day.

tuhlhorn
Topic Author
Posts: 14
Joined: Mon Aug 13, 2007 12:43 pm

### RE: CRJ 200 Hydraulics

Ahh, Thanks a bunch for the help, that makes a lot more sense now. For the guy wandering of my time when I was hired I have right under 900 total time with 12 hours of multi. Just turned 21, been a CFI for a year and a half in San Antonio, Just got my aviation degree. I brought with me 2 letters of rec. One from my boss at the school and one from the law firm that I fly a 210 for.

pilotpip
Posts: 2830
Joined: Fri Sep 19, 2003 3:26 pm

### RE: CRJ 200 Hydraulics

Tuhlhorn,

Don't beat yourself up studying if class hasn't started yet. Learn what they tell you, exactly what they tell you, and nothing more for right now. You're going to be trying to take a drink from a fire hydrant. If they gave you any memory items or flows I'd start working on those because it will be a huge help to be reviewing those rather than learning them later on.
DMI

NW747-400
Posts: 368
Joined: Tue Jun 08, 1999 4:42 am

### RE: CRJ 200 Hydraulics

The cross-side relationship on the hydraulic pumps is for redundency in the event of an engine failure. If the LH engine fails, pump 2B is shed because 2A is still providing pressure to the system. If the LH engine failed and 1B were to shed, you would lose both hydraulic pumps on the same system. Bombardier's design allows you to have all 3 systems still working in your favor in the event of an engine failure.

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