1. On Four Engined BA-146s, two engines have hydraulic pumps, and two have electrical generators. If you taxi the airplane only on the two engines with generators, you only have a few brake applications available before the hydraulic accumulators run out of brake pressure. On the way to the gate, the cockpit voice recorder captures one Pilot saying; If we go a little faster, then we could get the nose wheel off the ground. They were apparently unaware that the Auto Throttles were set in Take- Off mode. (Which disconnects the Brakes). As they approached the gate, they found they had no brakes (a result of being in the Takeoff Power mode) and proceeded to slam through the concourse jetway. Both the aircraft and jetway appeared to be totalled. PS – BTW - Always remain seated, with your seatbelt fastened, until the aircraft has STOPPED at the gate. How to TOTAL a BA-146 Commuter Plane

9. The End !