Whining flaps
Recently I flew on a Boeing 767-300 and sat with a great view of the wings and flight controls.
As we started the taxi to the runway the pilots dropped the flaps and this whining sound was heard Continuously as they came down it was so loud it made passengers and even I look at each other with faces suggesting the that's not normal look.
It was the same thing when flaps up were selected. And then for the approach into LGW it was horrendous even louder and kind of eerie if I might add for passengers as the weather was not interesting with winds gusting the aircraft was slow and low in a bank when full flaps was selected down in stages.
What causes this loud whining sound and is it normal I have never experienced this so loud before.
Thanks for any help.
Zazoo.