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CRJ-200 APU's  
User currently offlineMesaMXORD From , joined Dec 1969, posts, RR:
Posted (8 years 2 weeks 6 days 2 hours ago) and read 8945 times:

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

20 replies: All unread, jump to last
 
User currently offlineEasternSon From United States of America, joined Jun 2006, 668 posts, RR: 1
Reply 1, posted (8 years 2 weeks 5 days 18 hours ago) and read 8909 times:

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
User currently offlineEasternSon From United States of America, joined Jun 2006, 668 posts, RR: 1
Reply 2, posted (8 years 2 weeks 5 days 13 hours ago) and read 8869 times:

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
User currently offlineTinPusher007 From United States of America, joined Feb 2005, 977 posts, RR: 1
Reply 3, posted (8 years 2 weeks 5 days 13 hours ago) and read 8865 times:

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."
User currently offlineMesaMXORD From , joined Dec 1969, posts, RR:
Reply 4, posted (8 years 2 weeks 5 days 10 hours ago) and read 8840 times:

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 


User currently offlineLowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 5, posted (8 years 2 weeks 5 days 8 hours ago) and read 8828 times:

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.



Proud OOTSK member
User currently offlineBohica From United States of America, joined Feb 2004, 2689 posts, RR: 0
Reply 6, posted (8 years 2 weeks 5 days 8 hours ago) and read 8823 times:

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


User currently offlineG4Doc2004 From United States of America, joined Feb 2004, 123 posts, RR: 0
Reply 7, posted (8 years 2 weeks 5 days 7 hours ago) and read 8805 times:

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
User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 2 weeks 4 days 5 hours ago) and read 8749 times:

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


User currently offlineMesaMXORD From , joined Dec 1969, posts, RR:
Reply 9, posted (8 years 2 weeks 4 days 4 hours ago) and read 8733 times:

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


User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 10, posted (8 years 2 weeks 4 days 4 hours ago) and read 8728 times:

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!



Position and hold
User currently offlineBallpeeen From United States of America, joined Aug 2005, 77 posts, RR: 0
Reply 11, posted (8 years 2 weeks 4 days 3 hours ago) and read 8716 times:

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.


User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 12, posted (8 years 2 weeks 4 days 2 hours ago) and read 8710 times:

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.



Position and hold
User currently offlineA10WARTHOG From United States of America, joined Jul 2004, 324 posts, RR: 0
Reply 13, posted (8 years 2 weeks 2 days 4 hours ago) and read 8634 times:

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.

User currently offlineAC320tech From Canada, joined Jul 2006, 197 posts, RR: 1
Reply 14, posted (8 years 2 weeks 2 days 4 hours ago) and read 8629 times:

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.


User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Reply 15, posted (8 years 2 weeks 1 day 7 hours ago) and read 8573 times:

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


User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 16, posted (8 years 2 weeks 1 day 7 hours ago) and read 8570 times:

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.



Position and hold
User currently offlineMesaMXORD From , joined Dec 1969, posts, RR:
Reply 17, posted (8 years 2 weeks 1 day 6 hours ago) and read 8562 times:

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


User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 18, posted (8 years 2 weeks 1 day 5 hours ago) and read 8560 times:

Quoting MesaMXORD (Reply 17):

Very interesting, thanks!



Position and hold
User currently offlinerampboy77 From United States of America, joined Aug 2003, 64 posts, RR: 2
Reply 19, posted (4 years 3 months 3 weeks 3 days 15 hours ago) and read 6146 times:

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.

User currently offlineMir From United States of America, joined Jan 2004, 21561 posts, RR: 55
Reply 20, posted (4 years 3 months 3 weeks 3 days 13 hours ago) and read 6070 times:

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



7 billion, one nation, imagination...it's a beautiful day
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