MesaMXORD
Topic Author
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CRJ-200 APU's

Wed Aug 09, 2006 1:18 pm

I am just wondering if the Crj-200 Apu is the same as in the Challenger's. Did they put the light duty corporate APU in the Heavy duty Airline world? These things break alot and I was wondering the history on them
MESA - fighting common sense one day at a time
 
EasternSon
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RE: CRJ-200 APU's

Wed Aug 09, 2006 9:55 pm

I know that they use the same APU Generator, but as for the APU, I'm not sure.

I would imagine they are very similar, since the CRJ technically is a Challenger.

How often are they breaking? I know a lot of our customers have big problems with the APU Gens. Are you looking for another repair source?
"The only people for me are the mad ones...." Jack Kerouac
 
EasternSon
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RE: CRJ-200 APU's

Thu Aug 10, 2006 2:23 am

You got me asking questions, MesaMX, and no, popular opinion is that the APUs are similar, but not identical. They did beef it up a bit on the CRJ-200 aircraft because it is a slightly larger plane.
"The only people for me are the mad ones...." Jack Kerouac
 
tinpusher007
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RE: CRJ-200 APU's

Thu Aug 10, 2006 2:36 am

All I know is when you waork the ramp in the winter around those things, it is the perfect heater. Also works well to dry you off after getting drenched in the rain.
"Flying isn't inherently dangerous...but very unforgiving of carelessness, incapacity or neglect."
 
MesaMXORD
Topic Author
Posts: 176
Joined: Mon Mar 27, 2006 2:05 am

RE: CRJ-200 APU's

Thu Aug 10, 2006 5:18 am

Quoting EasternSon (Reply 1):
Are you looking for another repair source?

No, I was just wondering. Our APU Tech Rep was telling us they were not really made for the 10 cycles a day regional flying. And I haven't heard anything from the Corporate side.

Quoting TinPusher007 (Reply 3):
All I know is when you work the ramp in the winter around those things, it is the perfect heater. Also works well to dry you off after getting drenched in the rain.

Or when you are working on something and cant feel your hands it is nice.


On another note it seems like the ECS system on the 200's run fine all year until the temp gets above 85 F then all hell breaks loose. just my  twocents 
MESA - fighting common sense one day at a time
 
lowrider
Posts: 2542
Joined: Wed Jun 30, 2004 3:09 am

RE: CRJ-200 APU's

Thu Aug 10, 2006 7:40 am

Quoting TinPusher007 (Reply 3):
All I know is when you waork the ramp in the winter around those things, it is the perfect heater. Also works well to dry you off after getting drenched in the rain.

Also works to thaw a frozen lav cart.
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bohica
Posts: 2298
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RE: CRJ-200 APU's

Thu Aug 10, 2006 7:49 am

Quoting Lowrider (Reply 5):
Also works to thaw a frozen lav cart.

I was thinking the exact same thing while reading this post. You beat me to it.  Smile
 
G4Doc2004
Posts: 120
Joined: Thu Feb 19, 2004 7:49 am

RE: CRJ-200 APU's

Thu Aug 10, 2006 8:54 am

I believe it uses the Garrett (Honeywell) GTCP-150RJ APU.

[Edited 2006-08-10 02:00:15]
"Failure to prepare is preparing to fail"--Benjamin Franklin
 
DeltaGuy
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RE: CRJ-200 APU's

Fri Aug 11, 2006 10:11 am

It is a Garrett, and boy is that thing noisey....especially when the bearings are starting to go out, it makes a really scratching noise every few seconds. One of the loudest APU's I've ever had to work by.

Quoting TinPusher007 (Reply 3):
All I know is when you waork the ramp in the winter around those things, it is the perfect heater. Also works well to dry you off after getting drenched in the rain.

Or make you more prone to heat exhaustion during the summer!

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
 
MesaMXORD
Topic Author
Posts: 176
Joined: Mon Mar 27, 2006 2:05 am

RE: CRJ-200 APU's

Fri Aug 11, 2006 11:35 am

Quoting DeltaGuy (Reply 8):
It is a Garrett, and boy is that thing noisey....especially when the bearings are starting to go out, it makes a really scratching noise every few seconds. One of the loudest APU's I've ever had to work by

The best is people who are new to them. Every few minutes with the packs on the LCV modulates a little and sounds like something is going to break. The worst ones are the screamers....EGT within range everything ops checks good but mother of god that scream is obnoxious
MESA - fighting common sense one day at a time
 
bri2k1
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RE: CRJ-200 APU's

Fri Aug 11, 2006 11:49 am

Quoting DeltaGuy (Reply 8):
especially when the bearings are starting to go out, it makes a really scratching noise every few seconds



Quoting MesaMXORD (Reply 9):
Every few minutes with the packs on the LCV modulates a little and sounds like something is going to break. The worst ones are the screamers....EGT within range everything ops checks good but mother of god that scream is obnoxious

So what is it that makes the "shriek of death?" The first time I heard it was a severely delayed flight into YWG and we had to park on a ramp with no bridge in the dark. It was bad enough trying to avoid slipping down the stairs onto the ice to retrieve gate-checked bags, but with that godawful noise blaring every so often, it was nearly impossible to avoid falling down. I'd really like to know what makes it!
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ballpeeen
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RE: CRJ-200 APU's

Fri Aug 11, 2006 1:04 pm

To answer the original question, the core of the APU is the same, but there are some differences. The biggest is that Challengers don't have APU doors. (and don't you wish you could get rid of them on the -200, too!) The exception is the Challenger 300, which is completely different then a CRJ-200.

And what's with the whining about the APU noise on the -200? Have you guys ever heard the screaming death whistle on a EMB-145? It's about ten times louder than the CRJ.
 
bri2k1
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RE: CRJ-200 APU's

Fri Aug 11, 2006 1:29 pm

Actually, no I haven't. I usually fly on only the small Embraer jet, and it's usually into or out of DFW where they must hook up to ground A/C since I don't even usually notice the APU starting until it's just about time to push back.

I'm still curious about what causes the noise though. High-RPM turbine engines just sort of imply continous, routine power applied to linearly behaving systems. The Shriek is just for a second or fraction of a second and seems totally out of family with other turbine noise.
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A10WARTHOG
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RE: CRJ-200 APU's

Sun Aug 13, 2006 11:50 am

EMB-145 APU's screaming death whistle, have heard that many times, most often we have found the oring around the air inlet is bad or there is a bent blade. I have been at the hanger and could hear the APU screaming 1/2 mile away. Bent blade on that APU. Other wise if the silencer mod has been done the APU is not too bad.
 
AC320tech
Posts: 193
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RE: CRJ-200 APU's

Sun Aug 13, 2006 12:04 pm

Quoting A10WARTHOG (Reply 13):
EMB-145 APU's screaming death whistle, have heard that many times, most often we have found the oring around the air inlet is bad or there is a bent blade. I have been at the hanger and could hear the APU screaming 1/2 mile away. Bent blade on that APU. Other wise if the silencer mod has been done the APU is not too bad.

Dont forget about the 737-200, youll go deaf if you take your 'muffs off around the tail.

Im surprised no ones mentioned the 'void area' on the CRJ near the rear on the right side. Youll melt if you walk into it when the APU is on.
 
UAL Bagsmasher
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RE: CRJ-200 APU's

Mon Aug 14, 2006 8:29 am

From what I've been told, the real "screamers" out there have actually been damaged by glycol ingestion. Apparently the rampers shoot glycol down the intake in the winter. The APU tries to compress it, and it tweaks the blades enough to give the APU a permanent howl while operating from then on.

As for the APU doors, the Pots are 29 cent garbage (probably more like a few hundred $$) that don't last more than a month or two. The ECS system is always going uncontrollable in Auto and/or Manual. I spent a few hours yesterday tracing down a L/H pack uncontrollable in auto problem. It would work sometimes, and not others. Ended up being a relay in JB10 (gotta love the OPS checks after pulling that thing out Wink
 
bri2k1
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RE: CRJ-200 APU's

Mon Aug 14, 2006 8:34 am

I don't think that's what I've heard. The sound isn't constant. It only occurs for about 1-2 seconds and only about every 10-12 seconds or so.

Re: glycol damage, It doesn't instill loads of confidence in me that the people entrusted with deicing the plane don't know how to do so without damaging it.
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MesaMXORD
Topic Author
Posts: 176
Joined: Mon Mar 27, 2006 2:05 am

RE: CRJ-200 APU's

Mon Aug 14, 2006 9:58 am

Quoting Bri2k1 (Reply 16):
I don't think that's what I've heard. The sound isn't constant. It only occurs for about 1-2 seconds and only about every 10-12 seconds or so.

If APU rpm is equal to or above 99 percent for more than 4 seconds and APU bleed is
necessary, the ECU sends an electrical signal to the torque motor in the LCV. The
torque motor then causes the LCV to move in the direction of the fully open position.
When the LCV opens, bleed air is supplied to the aircraft pneumatic system.
If the use of bleed air causes the APU exhaust gas temperature (EGT) to rise more than
713° C (1316° F) the ECU will decrease the current to the torque motor. Decreased
electrical current to the torque motor causes the valve to modulate the LCV to a more
closed position. In this way, it keeps the EGT at or below 713° C (1316° F).

Basically the noise is the LCV unloading to keep the APU on-speed or W/I temp

Quoting A10WARTHOG (Reply 13):
EMB-145 APU's screaming death whistle

Man even with the hush kit when I used to work in CLT I could here those bastard childs from the Old Midway Hangar (current MESA) THEY ARE ON THE E GATES!  headache  The only good thing about the 145 is that it is a little hot rod and you can do your own pushbacks from the cockpit. LOL
MESA - fighting common sense one day at a time
 
bri2k1
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RE: CRJ-200 APU's

Mon Aug 14, 2006 10:46 am

Quoting MesaMXORD (Reply 17):

Very interesting, thanks!
Position and hold
 
rampboy77
Posts: 52
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RE: CRJ-200 APU's

Thu May 06, 2010 12:49 am

I try to stay away from the APU exhaust even though it is tempting in the wet winter months. 9E had a APU fail and blow chunks though a maintenance van in MEM. The van was a total loss with metal chunks piercing the vans engine.
 
Mir
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RE: CRJ-200 APU's

Thu May 06, 2010 2:42 am

Quoting Ballpeeen (Reply 11):
The biggest is that Challengers don't have APU doors. (and don't you wish you could get rid of them on the -200, too!) The exception is the Challenger 300, which is completely different then a CRJ-200.

The Challenger 300 doesn't have an APU door either.

-Mir
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