Air carrier flight crew reported an obstacle warning while descending below final approach fix altitude on a visual approach at night. The Captain leveled the aircraft upon activation of the obstacle warning; then continued the approach to a safe landing after the warning stopped.
Synopsis
Air carrier flight crew reported an obstacle warning while descending below final approach fix altitude on a visual approach at night. The Captain leveled the aircraft upon activation of the obstacle warning; then continued the approach to a safe landing after the warning stopped.
Narrative
Aircraft X My captain was PF and I was PM in this flight. After the arrival; ATC vectored us for the visual for 13R in SAT. We were at 3000 ft. on left downwind for 13R; Approach asked if we had the airport in sight. Captain told me he did; so we got cleared for the visual approach. My captain then went direct to the FAF; set 1400 ft. for altitude and went open descent. Originally I didn't see anything wrong since I thought he was trying to catch G/S from above. I had a late reaction and noticed we were about to go below 1800 ft. which was our stable altitude and we weren't fully configured. The terrain on Navigation Display went off and the obstacle callout went off. Captain quickly leveled off right at 1800 ft. and then we were fully configured. I mentioned to the Captain if that was unstable and he told me no since we didn't go below 1800 ft. At that point I second guessed myself and we continued the approach and landed. Looking back at it now I should of called the go around whether it was or wasn't stable.
Second reporter narrative
Aircraft X On arrival into San Antonio for Runway 13R; we were cleared for a visual approach while on the downwind. I selected direct to the Alamo fix and begin to set to 1500 ft. In the descending turn about localizer intercept the GPWS obstacle alert. I leveled the aircraft at 1800 ft.; after the alert stopped; I continued the approach to landing. On post flight examination of the ILS approach. I realized that I did not recognize the 1605 ft. tower just prior to the Alamo fix.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.