Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Inflight Event / Encounter CFTT / CFIT
Flight Crew Took Evasive Action
Environment - Non Weather Related; Human Factors
We had been cleared for the ILS 23 Approach. Just after crossing TRAVA intersection; we started our descent and got a GPWS aural warning; 'Caution Terrain.' We were indicating 4;000 ft. at 200 knots with flaps 8. We then got the aural warning 'Too Low; Terrain; Pull UP' at this point I performed the EGPWS escape maneuver by adding TOGA thrust and initiating a climb. The captain notified ATC of our GPWS warning and that we were initiating a climb. ATC responded with radar vectors back to shoot the ILS 23 approach again. I leveled off at 5;000 ft. after the warnings stopped. We completed the second approach without incident.
Just prior to reaching TRAVA on ILS 23 going into BUF at 4000 feet and flaps 8; ATC told us to descend to 2300 feet. My First Officer (FO) as flying pilot started to descend and we got a GPWS 'caution terrain'. A few moments later 'too low terrain'. Being IMC; my FO executed the EGPWS escape maneuver. We informed ATC of our climb and came back around to do ILS 23 again. At the same point over the ground and same configuration; EGPWS did not go off this time. We landed in BUF without incident.
Air carrier flight crew reported a terrain warning while on the ILS 23 approach to BUF.