Large Transport; Low Wing; 2 Turbojet Eng
Maintenance Airframe; Maintenance Powerplant
Distraction; Situational Awareness; Time Pressure
ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Clearance; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Flight Crew Regained Aircraft Control
Human Factors; Procedure
After holding short at [runway]; Control Tower told us that we were cleared to cross [runway] and expedite as there was another aircraft about to land. I started to advance engine throttles to expedite runway and saw aircraft getting closer to landing and I heard my taxi partner saying 'go ahead; expedite'. I thought we were in danger zone (middle of runway crossing it) and aircraft was ready for landing. There seemed to be a delay in the response of the aircraft to accelerate. We wanted to cross the runway and clear the path for the aircraft to land (and avoid a collision). I lost control of the aircraft trying to clear the runway. Aircraft did not respond to the right turn; ending on the grassed area. It all happened very quickly and I found myself in the middle of an expedite situation that required immediate action. In an aircraft landing situation like this; it would have been different if the control tower instructed us to wait for the other aircraft to land instead of clearing us to cross runway and expedite. Another suggestion is to improve taxi/engine run-up training to include practice for expedite situation.
A Maintenance Technician lost control of an aircraft following an expedited taxi across a runway with approaching landing traffic.