B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Gate; Flight Crew Rejected Takeoff
Aircraft
High speed reject initiated by me at approximately 110 knots. Takeoff warning horn; Takeoff configuration EICAS observed. FO later stated he saw the main cargo door light illuminated. Safely exited the runway and returned to ramp.Pressure door in main cargo door determined to be out of rig. Cargo door latches determined to be sound and secure. MEL applied and flight resumed. Second leg operational flight for new hire FO. He did a great job throughout evolution and contributed significant support both procedurally and knowledge based.
On the takeoff roll I was the PF and noticed around 110 kts the red 'main cargo door' light lit up. Before I was able to say anything the takeoff configuration warning horn started to sound and also got a red EICAS message. The captain took controls and called for the abort. We aborted; taxied off the runway and parked on a taxiway to run checklist and try to figure out what happened. The main cargo door light was no longer on at that time. The airplane had brake temps which were all in the 2-3 range. The chart showed that we weren't in danger of melting any fuse plugs. We taxied back to the ramp and Maintenance took a look at the cargo door. One of the pressure vents was faulty and cause the indication. They confirmed the door was locked; safe; and MELed the system. We departed without any further issues. Faulty vent or sensor on the main cargo door causing main cargo door indication during takeoff roll. From a flight crew perspective nothing could have been done differently. All doors were closed and locked prior to pushback and remained that way until the faulty sensor caused the issue during the takeoff roll.
B757 flight crew reported aborting their takeoff around 110 knots due to receiving a red EICAS message regarding the main cargo door.