Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport
Aircraft; Weather
During takeoff R GEN OFF EICAS message illuminated. We requested to remain in the local airport area to run checklists. ATC granted our request and authorized a return to the runway. We completed the checklist with the generator being reset. I elected to return as the safest option as we were VFR; the runway was right there; we had previously operated the aircraft with no indication of a generator issue for over 3 hours; en-route weather called for thunderstorms. I believed the return to determine the cause of the failure before proceeding to be the safest choice.After takeoff clearance was received and during taxi onto the runway; the off flag in the standby gyro appeared. We requested to taxi clear of the runway. After stopping on the taxiway the flag receded. I called the Chief Pilot and requested clearance from ATC back to the runway for departure and completed an uneventful takeoff.
At takeoff R GEN OFF EICAS message illuminated. We then requested time to run the check lists and were granted time in the local area for them to be completed. We completed the check list and the generator was reset at that point. With all systems operating normally we requested and were given clearance to land.
Although it reset and operated normally; the flight crew of a B757-200 opted to return to their departure airport when their EICAS advised the right generator was off.