B757 Undifferentiated or Other Model
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Returned To Gate; General Maintenance Action; General Declared Emergency
Aircraft
Tower cleared [us] into position on runway. Aircraft behind us reported smoke and contained flames in the area of APU. We requested fire equipment investigate. There were no indications of fire in the cockpit or cabin. Fire department confirmed fire. Extinguished the fire and we taxied back to the gate and deplaned passengers.
There were no indications in the cockpit. The APU had been shut down for approximately 10 minutes; and read 7 ITT and 0 RPM.
B757 flight crew holding in position on runway reported they were advised by an aircraft behind them their APU was on fire; although there were no confirming cockpit indications. ARFF was called to the scene.