Whirring Sound From A320 Engines. — Tech Ops Forum

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Whirring Sound From A320 Engines.

SSTjumbo From , joined Dec 1969, posts, RR:
Posted (10 years 9 months 3 weeks 2 days 5 hours ago) and read 848 times:

Does anyone know what causes this? I have heard it on NWs and UAs A320s.

6 replies: All unread, jump to last

Tupolev154B2 From United States of America, joined Jun 2000, 1332 posts, RR: 3
Reply 1, posted (10 years 9 months 3 weeks 2 days 4 hours ago) and read 816 times:

I noticed that on IAE A320's, there is a low-pitched whining sound that is quite loud and can be heard when the aircraft is quite high. It sounds like a prop plane's engine except that it is of slightly higher pitch and is a clearer whine without the sound of beating air mixed into it. Instead you first hear the whining sound then as the jet flies over you, you hear the roar of the air from the engine. What is it?

SSTjumbo From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 9 months 3 weeks 2 days 4 hours ago) and read 807 times:

When the jet flies overhead like on approach, there's that multipitched whine that occurs. That's what I'm talking about.

JETPILOT From United States of America, joined May 1999, 3128 posts, RR: 37
Reply 3, posted (10 years 9 months 3 weeks 2 days 4 hours ago) and read 805 times:

Yeah...its caused by the engine spining and hopefully you hear it during the entire flight.

JET

SSTjumbo From , joined Dec 1969, posts, RR:
Reply 4, posted (10 years 9 months 3 weeks 2 days 2 hours ago) and read 792 times:

Why don't I hear it on 737s though?

SSTjumbo From , joined Dec 1969, posts, RR:
Reply 5, posted (10 years 9 months 3 weeks 2 days 1 hour ago) and read 793 times:

BTW, it is the high-pitched whistle I am talking about on approach or when the plane is about 1000' overhead, not the muscle car sound when the plane takes off.

Tupolev154B2 From United States of America, joined Jun 2000, 1332 posts, RR: 3
Reply 6, posted (10 years 9 months 3 weeks 1 day 8 hours ago) and read 756 times:

Or perhaps when the aircraft is on final approach 5 miles from the airport, but rather quite high up on approach and maintaining level flight until final approach. 737's have CFM's and I only noticed that sound coming from IAE A320's.