B777 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 240; Flight Crew Total 17000; Flight Crew Type 5000
Troubleshooting; Human-Machine Interface; Distraction; Confusion
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; General Declared Emergency; General Maintenance Action
Aircraft
In the high speed regime on takeoff roll we received an inhibited Master Warning. Right after liftoff after the aircraft entered the 'Air Mode' numerous cockpit lights illuminated (15+) on both the overhead panels and the pedestal. All aircraft systems continued to operate normally but the warning; caution and inoperative lights stayed illuminated. We checked the Electrical Synoptic and it showed normal ops for the electrical system. We declared an emergency and landed on the runway of takeoff with no irregularities. Upon touchdown all of the erroneous indicating lights went out. Maintenance suspected an ELMS [Electrical Load Management System] Fault.
The Captain who was the flying pilot had no abnormal indications.As the Captain continued the takeoff; upon retracting the gear; I noticed a series of unrelated off and caution lights on the overhead panel; my entire comm panel was illuminated and both engine fire bottle discharge lights were illuminated as well.
The flight crew of a B777 declared an emergency and returned to their departure airport following receipt of numerous and inappropriate warning and caution lights late in the high speed regime of the takeoff roll.