shon,
we can do that on our b777-200 too. it happenned to me once when i had to ferry one of our b777 to the maintenance hangar at a close-by airfield. when we got there, there wasn't any steps for us so with some help from the engineers we descended into the E&E bay (which is assessable with a hatch from the cabin) then from there another hatch to the outside. the trick is to get from the acft onto the ground. the hatch to the ground is a good 7-8 feet!! good thing the engineers had a maintenance step which we can use.
SR