PPRuNe Forums - Acoustic Resonance on a321's ?

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7gcbc

16th February 2006 22:43

Acoustic Resonance on a321's ?

Only ever noticed this on the 321's as pax, never heard it on the 74,77, or 73, however the last two/three flights as a pax on the 321's out of Eire I have definitely experienced resonance at low/sub/taxi power, infact it became uncomfortable after a minute or so, so much infact I was glad of the spool up to the TO run.

Is there a known rpm range to avoid for the powerplants on a321's ?

barit1

17th February 2006 02:07

Which powerplant is involved - V2500 or CFM56-5? It sounds like a combustor resonance a la RB211. :ooh:

7gcbc

17th February 2006 04:00

Hi Barit1,

CFM56-5B3's the type I was on was badged a 321 although they also have the 5B4's on their 320's.

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