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Chirping Sound After Landing And Reverse Thrust.  
User currently offlineGotAirbus From Singapore, joined May 2001, 851 posts, RR: 1
Posted (13 years 8 months 2 weeks 3 days 21 hours ago) and read 4270 times:

Hi! I hope I can get input from CRJ technicians and/or people who travel in the CRJs; however, if you hear the same sound (read paragraph below) on a different aircraft, feel free to post...

I took an America West Express CRJ-200 jet a while back and was wondering what the chirping sound was. It happened after the reverse thrusters ended and we were about to exit the runway into the taxiway. It sounds like a one time "chirp" as if something was retracted or de-activated...

Oh, and I am in the process of uploading that "chirping" sound if you want to hear what it's like (if I have the time to upload.)

(gotAirbus)-(got commonality?)-(Have A Nice Flight!)

(gotAIRBUS?) - (Got Commonality?) - (Have A Nice Flight!)
4 replies: All unread, jump to last
User currently offlineNight_Flight From United States of America, joined May 1999, 156 posts, RR: 0
Reply 1, posted (13 years 8 months 2 weeks 2 days 8 hours ago) and read 4170 times:

The sound may be the sound of the pressure dumping our of the fuselage. When there is weight on the wheels, a switch is activated and the remaining pressurization gets dumped so the pressure is equal to that at ground level. This dumping may be the sound you are hearing.


Remember when sex was safe and flying was dangerous?
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 2, posted (13 years 8 months 2 weeks 2 days 7 hours ago) and read 4158 times:

I'm not sure if you saw the wing at the time, but flap retraction perhaps?


User currently offlineGotAirbus From Singapore, joined May 2001, 851 posts, RR: 1
Reply 3, posted (13 years 8 months 2 weeks 1 day 11 hours ago) and read 4097 times:

Nop Bio15, just a chirp; not a whine+chirp, just like a flap would.

(gotAirbus?)-(Got Commonality?)-(Have A Nice Flight!)

(gotAIRBUS?) - (Got Commonality?) - (Have A Nice Flight!)
User currently offlineFr8tdog From United States of America, joined Feb 2000, 120 posts, RR: 0
Reply 4, posted (13 years 8 months 1 week 5 days 4 hours ago) and read 4000 times:

its possible that it could be the translational cowls restowing...
most of us allow the engines to spool down a bit prior to stowing to prevent a big push from the engines......we have to be below 30% N1 when below 60kts
to prevent FOD ingestion....
fr8t... CL65/44 Capt.

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