Air carrier flight crew reported a terrain warning while on the ILS 23 approach to buf.

Attributes
ACN	1623828
Time
Date	201903
Local Time Of Day	1201-1800
Place
Locale Reference	BUF.Airport
State Reference	NY
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Inflight Event / Encounter CFTT / CFIT

Narrative:

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.

Original NASA ASRS Text

Title: Air carrier flight crew reported a terrain warning while on the ILS 23 approach to BUF.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.