Narrative:

During a flight from ZZZ to sxk on an IFR flight plan; I asked minneapolis center if we could set up for the RNAV 35. The conditions at the time of the approach and landing were clear and unrestricted visibilities with a light wind out of the northeast. We were cleared for the approach and had it coupled to the autopilot. Navigation and VNAV were selected on the autopilot and captured the approach as designed. During the final approach about 500 ft. AGL we noticed a small hill located 1/2 from the runway end and discussed with the captain that it should not affect our flight path. Around 300 ft. We receive a terrain annunciation from our egpws (enhanced ground proximity warning system) followed by pull up; which repeated constantly during the landing phase. We determined visually we were not in any danger of striking the terrain we continued the approach and landing; which we completed with no further anomalies.after parking and exiting the aircraft; we discussed this with the airport manager at the airport and he confirmed to us that the airport was brand new (about a year) and not a part of the terrain database as of yet. This would explain the egpws warnings during landing. I mentioned to the airport manager that this should somehow be in the notams. Currently there are no published notams concerning this anomaly at sxk. We understand that this is may not be an everyday occurrence but feel that this should have been in the NOTAM database since this airport was opened. If it had been a day that was IMC and down to minimums we would have had no choice but to complete a missed approach or complete evasive maneuvering due to the terrain warnings.

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Original NASA ASRS Text

Title: DA50 First Officer reported false Enhanced Ground Proximity Warning System Alert warning on final approach.

Narrative: During a flight from ZZZ to SXK on an IFR flight plan; I asked Minneapolis Center if we could set up for the RNAV 35. The conditions at the time of the approach and landing were clear and unrestricted visibilities with a light wind out of the northeast. We were cleared for the approach and had it coupled to the autopilot. NAV and VNAV were selected on the autopilot and captured the approach as designed. During the final approach about 500 ft. AGL we noticed a small hill located 1/2 from the runway end and discussed with the Captain that it should not affect our flight path. Around 300 ft. we receive a terrain annunciation from our EGPWS (Enhanced Ground Proximity Warning System) followed by PULL UP; which repeated constantly during the landing phase. We determined visually we were not in any danger of striking the terrain we continued the approach and landing; which we completed with no further anomalies.After parking and exiting the aircraft; we discussed this with the Airport Manager at the airport and he confirmed to us that the airport was brand new (about a year) and not a part of the terrain database as of yet. This would explain the EGPWS warnings during landing. I mentioned to the airport manager that this should somehow be in the NOTAMs. Currently there are no published NOTAMs concerning this anomaly at SXK. We understand that this is may not be an everyday occurrence but feel that this should have been in the NOTAM database since this airport was opened. If it had been a day that was IMC and down to minimums we would have had no choice but to complete a missed approach or complete evasive maneuvering due to the terrain warnings.

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.