That rattle on a windy morning
PPRuNe Engineering Dept Apprentice
Thread Starter
Join Date: Mar 2001
Location: Deep in the boglands of Western Ireland
Posts: 295
Likes: 0
Received 0 Likes
on
0 Posts
That rattle on a windy morning
Many times I've taken the scenic route from the car park to my company's lair in the Baggage Hall, and on the windier mornings, before many of the aircraft are on their way, you can hear this almighty rattling din coming from the engines.
Obviously it's from the fan blades, but what I'd like to know is there a sound reason why the blades are let run & rattle on the ramp like that?
Obviously it's from the fan blades, but what I'd like to know is there a sound reason why the blades are let run & rattle on the ramp like that?
Join Date: Jan 2001
Location: Around the world.
Age: 42
Posts: 606
Likes: 0
Received 0 Likes
on
0 Posts
Simply the fan blades are loose without aerodynamic and centrifugal loading on them, so as they fall over the top they click.
At least on the aircraft I fly most (if not all)the noise seems to come from the front fan when windmilling
At least on the aircraft I fly most (if not all)the noise seems to come from the front fan when windmilling
Join Date: Jan 2008
Location: Herts, UK
Posts: 748
Likes: 0
Received 0 Likes
on
0 Posts
I suppose the reason not to stop it, is jamming or clamping them would be far too prone to accidental foreign body ingestion (forgetfulness)...
It obviously doesn't do any harm to the blade roots... those are often fir-tree style blade roots flipping across
It obviously doesn't do any harm to the blade roots... those are often fir-tree style blade roots flipping across
