2024-08 · NASA ASRS report 2152155
B747-8F flight crew reported on takeoff roll; the aircraft pulled to the right and the FO stated they had full left rudder applied. They rejected the takeoff below 30 knots.
All operations were normal as we taxied to Runway XX at ZZZ. The F/O was the pilot flying. We were cleared for takeoff and the F/O entered the runway. Because of our position we had to make an approximately 120 degree turn on the runway. The F/O indicated to me he was ready to begin the takeoff. I advanced the throttles and engines spooled up normally. As the airplane accelerated I noticed we were slowly trending to the right; the direction of our original turn.The F/O stated I have full left rudder applied. I pulled throttles to idle and the airplane came to a stop. The speed was below 30 knots. The airplane responded normally to tiller inputs as we exited the runway. We checked brake temp charts and had no time restrictions. At no time did the aircraft give any cautions or warnings or config warnings. I contacted Dispatch and we agreed to attempt takeoff again as there were no concerns about fuel. The next takeoff was normal and we proceeded to destination.Cause: Maybe body gear issueSuggestions: none
As I lined up with the center line I said I was ready; took my hands of the thrust levers and said that I was off the tiller. As the Captain advanced the thrust the airplane turned toward the right and with full left rudder the plane did not correct back to the left. I said I'm full left rudder stop; stop; stop" and the Captain immediately brought the thrust to idle. I used brakes to stop the airplane and I think the Captain did as well. We transferred the controls to the Captain and I called the abort with the tower. We cleared the runway; and set the brake to figure out what happened. The first observer said that he saw a momentary red EICAS but didn't know what it was. There was no master warning or caution. It was thought that perhaps the body gear had not completely straightened out at the beginning of the takeoff roll; causing the airplane to go right.The brake cooling chart was referenced with no need for a cool down time. The Captain called Dispatch and all agreed that another takeoff was justified. The next takeoff roll was uneventful. During the climb however we got a brake temp EICAS. I opened the speed window to maintain a speed below gear extend while the Captain used the gear temp checklist and lowered the gear. A heading was given by departure to take us off the SID and we stopped the climb to finish the checklist and allow for the 8 minute cool down time. The temperature on the hot brake (#3) cooled. We rejoined the SID and continued the climb. observer called Dispatch for a reanalysis and also talked to maintenance about our hot brake. All agreed we could continue to ZZZ1. The rest of the flight was uneventful. There was no further problem with the brake temperature after landing. The rejected takeoff and hot brake were entered in the logbook.Cause: I can't say what cause the initial drift to the right on the first takeoff but the thought that the body gear was not fully centered seems the most likely to me. I do not know what caused the hot brake.Suggestion: I think an extra second or two while lining up with the runway to be sure that the body gear are completely straight would keep this from happening."
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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