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Noise in icing

Posted: Mon Mar 09, 2020 5:13 pm
by salim
Hello,

I have noticed that whenever I encounter (moderate) icing a sort of rumbling noise appear on my DA42 tdi and on another similar DA42.

I see no other abnormal indications beside the slight IAS loss due to the icing.

Any idea of the cause of the noise ?

Thank you !
Salim

Re: Noise in icing

Posted: Mon Mar 09, 2020 7:23 pm
by ememic99
salim wrote: Mon Mar 09, 2020 5:13 pm Hello,

I have noticed that whenever I encounter (moderate) icing a sort of rumbling noise appear on my DA42 tdi and on another similar DA42.

I see no other abnormal indications beside the slight IAS loss due to the icing.

Any idea of the cause of the noise ?

Thank you !
Salim
Same here. I guess the pieces of ice just stuck in air inlet.

Re: Noise in icing

Posted: Wed Mar 11, 2020 7:26 am
by neema
I've heard/felt it too. Occasionally, the cabin air inlet plugs up somewhere with ice creating suction/buffeting sound from the cabin vents. A few pats on the vent with the hand can open it up. Just be prepared to be shot with ice pellets when it unclogs. I have a video of it somewhere. I'll try to dig it up

Re: Noise in icing

Posted: Wed Mar 11, 2020 6:56 pm
by Roxi5m9
Same here! And I have a 2004 DA40. Twice I’ve had to descend through a layer of icing building up moderate clear icing on the leading edges and the prop, and both times the suction/buffeting sound occurred in the cabin. I assumed the icing buildup was occurring in the NACA air inlet under the wing.

Re: Noise in icing

Posted: Thu Mar 12, 2020 4:38 pm
by neema
Sorry for the dumb laughing, but you can see the flow of air switching back and forth with the towel held up in front of the vent.