On Friday 1 June 2007, a Twin Otter, registered PK-YRU overran the right side of the runway at Mulia Airport (LII). Indonesia during the takeoff roll. The aircraft left the runway and impacted a ditch and rocks on the right shoulder of the runway. Main-wheel tire marks for more than 65 meters on the runway indicated that heavy braking action was being applied to the left brake. The aircraft was substantially damaged. None of the occupants were injured. The handling pilot was undergoing captaincy training under the supervision of an instructor. The investigation was unable to determine why the aircraft commenced veering to the right during the early acceleration phase of the takeoff. The pilots continued the takeoff and directional control was lost during the takeoff roll. The instructor pilot was unable to regain directional control of the aircraft before it left the runway. No aircraft or system defect was found that could have contributed to the pilots’ inability to maintain directional control during the takeoff roll. The pilot under training stated that “things happened fast” and he was “unaware that the power levers were still in the full on position”, but was “conscious that his left hand was on the steering handle”. He said that he did not immediately respond to a shout from the instructor to not use the steering handle. CAUSES: “The investigation considered that it was possible that the nose-wheel steering was not centred before commencing the take-off roll and that the pilot under training may have been unaware that he was holding an inappropriate nose-wheel steering position during the take-off roll.”