CRJ Hydraulic Question...

[SmackYourPappy]

Why would the APU be running at cruise altitude anyway? It destroys the APU box, I dont think so.
There's pump 3B if everything goes to $hit.

Mr. CRJ Driver....

I assume you have never flown or accepted an a/c that has had a GEN deferred? It occurs every now and then although I haven't had to do it in a while. The procedures in the MEL spell out the need to run the APU continuously in flight to provide another GEN source and they also state that the fuel burn should be compensated/increased for the APU usage in cruise.. No need to tansfer bleeds, just electricity.

Also, Pump 3B wont do jack if the lines are severed.... I can just see you switching it to ON and easing the seat back to finish off the Starbucks and Comics....

Tailwinds

 

[ICU]

Why would the APU be running at cruise altitude anyway? It destroys the APU box, I dont think so.
There's pump 3B if everything goes to $hit.

Please tell me this was a joke, or you were drunk when you wrote this? There could me small children reading your stuff in first grade who might all assume we are all a bunch of idiots.

 

[CRJ Driver]

Ok boy and girls I guess YOU all need a review or a PC.

System 3

Description:

System 3 components are in or near the main landing gear bay. The main components are: an accumulator, a reservoir and two alternating current motor pumps (ACMPs 3A and 3B) System 3 services the largest demands of the three systems.

Hydraulic System 3 powers:

Rudder and Elevator
Left and right aileron
Left and Right Spoileron
Landing Gear
Nosewheel steering
Nose Door
Inboard Brakes

 

[SmackYourPappy]

Ok boy and girls I guess YOU all need a review or a PC.

System 3

Description:

System 3 components are in or near the main landing gear bay. The main components are: an accumulator, a reservoir and two alternating current motor pumps (ACMPs 3A and 3B) System 3 services the largest demands of the three systems.

Hydraulic System 3 powers:

Rudder and Elevator
Left and right aileron
Left and Right Spoileron
Landing Gear
Nosewheel steering
Nose Door
Inboard Brakes

Not to get picky, but the original hypothesis stated that the APU has an uncontained explosion (kinda like what happened to an AMR F100 at ORD last winter when the de-ice crew decided to squirt some type 1 into the intake for good measure.) If the explosion is of the force to rip open the box, then there is a pretty good chance that it might sever the lines.

And before you go quoting from the manual, yes I have seen with my own two eyes how the line from SYS 3 is located physically apart from 1 & 2. Either way if there's that much damage, then you can still bleed 3 dry through the broken line since it does power the rudder & elevator.

Besides... why would we be cruising with the APU on?

Tailwinds

 

[CRJ Driver]

How do you know that the lines for system 3 run thru the aft equipment bay?

 

[DoinTime]

How do you know that the lines for system 3 run thru the aft equipment bay?

How else are they going to get from the wheel well to the rudder and elevator?

 

[CRJ puppy]

Did you forget about "PFM"?

 

[ICU]

I'm going to find my happy place