RJ100 - Tail Spoilers

[weegsltl]

Hello,

I flew out of London City in July and was surprised to see a BA RJ100 parked up, however with its tail air brakes in the open position.

I have also recently flown out and back into Manchester and once again there were several BA RJ100's parked up with their tail air brakes open.

Can someone please explain as to why the tail brakes are left open when they are parked.

Thanks