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BR715 Start-up Noises  
User currently offlineN8911E From United States of America, joined May 2012, 48 posts, RR: 0
Posted (2 years 3 months 3 weeks 1 day 18 hours ago) and read 3020 times:

Hello,

I am oblivious as to what the noises are when a BR715 FIRST Starts. It sounds like card spokes in a bicycle as it slowly starts up. I never notice this on any other engine.

Can ANYBODY please help me figure out what that sound is, and why it is so noisy at first?

It starts at around 0:30. Do any other High-Bypass Turbofans make that noise, or is it specific to the BR700 series?
http://www.youtube.com/watch?v=QAJMRyJem-M

8 replies: All unread, jump to last
 
User currently offlinePapaChuck From United States of America, joined Aug 2010, 136 posts, RR: 0
Reply 1, posted (2 years 3 months 3 weeks 1 day 12 hours ago) and read 2956 times:

If you are referring to the loud buzzing sound as the engine starts, that's more than likely coming from inside the cabin. Could be almost anything, perhaps a loose tray table latch or some other plastic fitting vibrating in harmony with the engine. Hard to tell, but it sounds like it's coming from inside, not out.

PC



In-trail spacing is a team effort.
User currently offlinenjxc500 From United States of America, joined Dec 2007, 240 posts, RR: 0
Reply 2, posted (2 years 3 months 3 weeks 1 day 9 hours ago) and read 2923 times:

It may just be an artifact in the recording caused by the vibration....just a thought.

User currently offlineN243NW From United States of America, joined Jul 2003, 1630 posts, RR: 20
Reply 3, posted (2 years 3 months 3 weeks 1 day 2 hours ago) and read 2788 times:

To me, it definitely appears to be some cabin fixture rattling. It's a plasticky sound, so it would strike me as a cabin ceiling or sidewall panel, overhead bin, tray table, seat, etc.


B-52s don't take off. They scare the ground away.
User currently offlineSPREE34 From United States of America, joined Jun 2004, 2248 posts, RR: 9
Reply 4, posted (2 years 3 months 3 weeks 22 hours ago) and read 2733 times:

Sounds like the inner plasic window.


I don't understand everything I don't know about this.
User currently offlineN8911E From United States of America, joined May 2012, 48 posts, RR: 0
Reply 5, posted (2 years 3 months 3 weeks 18 hours ago) and read 2673 times:

Thanks guys. May I ask, and possibly get some answers as to why it does this on the 717 only? DC9s or MD80s don't do it, and I can't recall if the MD-90 did it.

User currently offlineSPREE34 From United States of America, joined Jun 2004, 2248 posts, RR: 9
Reply 6, posted (2 years 3 months 2 weeks 6 days 23 hours ago) and read 2527 times:

I've never heard it on the 717. Heard it on the L1011 a couple of times. I've heard the 1011 do it windows in a building.


I don't understand everything I don't know about this.
User currently offlinekcrwflyer From United States of America, joined May 2004, 3814 posts, RR: 7
Reply 7, posted (2 years 3 months 2 weeks 6 days 22 hours ago) and read 2509 times:

Quoting N8911E (Reply 5):
Thanks guys. May I ask, and possibly get some answers as to why it does this on the 717 only? DC9s or MD80s don't do it, and I can't recall if the MD-90 did it.

The 717 engine and the D9/MD engines are drastically different.


The 715 can have a very deep growl when getting started.. sometimes more noticeable than others. The rattling sounded like a vibration in the cabin.


User currently offlineAA737-823 From United States of America, joined Mar 2000, 5779 posts, RR: 11
Reply 8, posted (2 years 3 months 13 hours ago) and read 1794 times:

Yup, it's interior stuff.
The BR715 does have some very distinctive startup noises, though... I always thought the thing sounded like someone filled the oil reservoir with bee-bees.


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