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ERJ 145 APU.  
User currently offlineCodeshare From Poland, joined Sep 2002, 1854 posts, RR: 1
Posted (11 years 2 months 3 weeks 4 days 3 hours ago) and read 5064 times:

The APU of this a/c is very noisy. I believe it's one of the loudest out there.

Why is that?



How much A is there is Airliners Net ? 0 or nothing ?
8 replies: All unread, jump to last
 
User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 2 months 3 weeks 4 days ago) and read 5008 times:

I agree. Of all the aircraft I have seen, and heard, the ERJ APU is very noisy. The CRJ is a whisper compared to the ERJ. I got to tour the inside and out of the FLJetconnect CRJ, and when I walked around the back, it was quiet, and the APU blew it's warm exhaust all over me and it felt so good from that 32 degree cold weather in ATL.

User currently offlineE1FAIL From United States of America, joined Dec 2002, 74 posts, RR: 0
Reply 2, posted (11 years 2 months 3 weeks 4 days ago) and read 5003 times:

Did the APU you heard have the silencer installed? There is a huge difference between the silenced and unsilenced versions.

User currently offlineCodeshare From Poland, joined Sep 2002, 1854 posts, RR: 1
Reply 3, posted (11 years 2 months 3 weeks 3 days 2 hours ago) and read 4944 times:

Perhaps it costs a lot. Maybe that's why some airlines don't have it.


How much A is there is Airliners Net ? 0 or nothing ?
User currently offlineRamper@iah From United States of America, joined Dec 2001, 240 posts, RR: 1
Reply 4, posted (11 years 2 months 3 weeks 3 days ago) and read 4935 times:

The APU is only loud if you are standing directly beneath it, otherwise, it's bearable to work anywhere around the aircraft without ear plugs. It is possible that you could be mistaking the sound of the air conditioning packs for the sound of the APU. The AC packs are located on each side of the aircraft near the forward wing root. The high pitch noise is piercing, so it is typical to only use the right pack while the main cabin door is open. The left pack, of which 75% of its air goes to the cockpit, is usually turned on after the engines are started. While they are noisy, one can't complain of their effectiveness. They'll actually blow snow into the cabin even when the outside air temperature is above 100 degrees!

User currently offlineCodeshare From Poland, joined Sep 2002, 1854 posts, RR: 1
Reply 5, posted (11 years 2 months 3 weeks 2 days 7 hours ago) and read 4892 times:

I saw a Swiss E145 with a sort of nozzle on the APU. And it was much more quiet.


How much A is there is Airliners Net ? 0 or nothing ?
User currently offlineJetdoctor From United Kingdom, joined Aug 2001, 257 posts, RR: 0
Reply 6, posted (11 years 2 months 3 weeks 1 day 22 hours ago) and read 4867 times:

Ramper@iah

Being technical, the "snow" would be really hail hehehe, I do agree the packs works well.
As to why the APU is loud? It just is. Try writing to Hamilton Sundstrand (it's manufacturer) The silencer helps a lot, but it is just a very loud APU. But it works (75% of the time, unless it is winter when glycol gets in there)

Jetdoctor



Break ground, and head into the wind. Don't break wind and head into the ground.
User currently offlineRamper@IAH From United States of America, joined Dec 2001, 240 posts, RR: 1
Reply 7, posted (11 years 2 months 3 weeks 1 day 19 hours ago) and read 4854 times:

"Being technical, the "snow" would be really hail hehehe..."

Yeah, you're right. Those little ice pellets that fly through the cabin get annoying. One passenger complained to the flight attendant that someone was shooting spit-balls at her. I'd rather have the frozen precip in the cabin any day over sitting in the sweltering heat like an MD-80 or a classic Boeing.


User currently offlineDrewwright From United States of America, joined May 2001, 621 posts, RR: 1
Reply 8, posted (11 years 2 months 3 weeks 23 hours ago) and read 4819 times:

I had the opportunity to compare APU's on ERJ's a couple of weeks ago in MSY. Our plane parked right next to another company plane that had the old short exhaust pipe on it, and even inside our cabin I had to stuff TP in my ears to avoid hearing damage. There is quite a difference in noise levels between the two APU's. As noted above, the A/C packs generate quite a bit of noise too (as well as snow in the cabin). It is always funny when the flight deck switches both packs on because you can hear the ice moving through the ducts right before the pellets spit out onto the pax.

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