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CRJ 200 Hydraulics  
User currently offlineTuhlhorn From United States of America, joined Aug 2007, 14 posts, RR: 0
Posted (6 years 10 months 2 weeks 6 days 6 hours ago) and read 4005 times:

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.

10 replies: All unread, jump to last
 
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 1, posted (6 years 10 months 2 weeks 6 days 5 hours ago) and read 4002 times:
AIRLINERS.NET CREW
DATABASE EDITOR

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

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

2H4



Intentionally Left Blank
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2556 posts, RR: 24
Reply 2, posted (6 years 10 months 2 weeks 6 days 5 hours ago) and read 3992 times:

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.
User currently offlineTornado82 From , joined Dec 1969, posts, RR:
Reply 3, posted (6 years 10 months 2 weeks 6 days 5 hours ago) and read 3984 times:

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.


User currently offlineNucsh From United States of America, joined Apr 2004, 238 posts, RR: 0
Reply 4, posted (6 years 10 months 2 weeks 6 days 3 hours ago) and read 3962 times:

Quoting Tornado82 (Reply 3):
just an advertisement but in reality you still need the 1000 + 100.

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.
User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 5, posted (6 years 10 months 2 weeks 6 days 3 hours ago) and read 3948 times:

Quoting Tornado82 (Reply 3):
commercial/multi/instrument only mins are just an advertisement but in reality you still need the 1000 + 100.

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


User currently offlineN710PS From United States of America, joined Oct 2006, 1166 posts, RR: 3
Reply 6, posted (6 years 10 months 2 weeks 6 days 2 hours ago) and read 3930 times:

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!
User currently offlineFreshlove1 From , joined Dec 1969, posts, RR:
Reply 7, posted (6 years 10 months 2 weeks 6 days 2 hours ago) and read 3924 times:

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.


User currently offlineTuhlhorn From United States of America, joined Aug 2007, 14 posts, RR: 0
Reply 8, posted (6 years 10 months 2 weeks 6 days 1 hour ago) and read 3911 times:

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.

User currently offlinePilotpip From United States of America, joined Sep 2003, 3150 posts, RR: 11
Reply 9, posted (6 years 10 months 2 weeks 6 days ago) and read 3905 times:

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
User currently offlineNW747-400 From United States of America, joined Jun 1999, 502 posts, RR: 0
Reply 10, posted (6 years 10 months 2 weeks 1 day 23 hours ago) and read 3739 times:

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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