grand piano mode !
from my time working on the trident I cant remember any way that just the main gear could be used as a speedbrake but I have no doubt that in "full drag" mode the Trident could fall out of the sky in a spectacular fashon , this seems to be a bit of a Hatfield thing as the only thing that the BAe 146 could do better than any other aircraft that I have flown was go down !.