Narrative:

We were offered a visual to runway 1R instead of 25L as winds were from the north at 15 knots. We accepted vectors for the 1R visual. The first officer disconnected the autopilot somewhere south of the airport in a dogleg turn about 25-30 south. We reported the airport in sight just prior to that point and were cleared for a visual to 1R without other airspeed or altitude clearance. We were at 7;000 feet and 210 knots. I then put 3;500 feet in the altitude window as the first officer had a reference point in the FMGC to the runway giving us a 3 degree glideslope for reference. I had the 1R RNAV approach plate in front of me and saw that we should have been at 5;000 feet at 10 NM. We were on that profile inside of 15 NM and I spoke with the tower during this time and noticed we were going to cross the 10 nm point just below 5;000 feet. Before I started to mention it; we received an egpws warning 'terrain; terrain; pull up; pull up'. It lasted about 2-3 seconds. I believe we reached 4;800 feet or slightly above at this time at about 10.5 nm. The first officer began to start a climb and as we were at level and he put his hands on the levers; the warning stopped after one cycle. There was some sparse green terrain on our displays the entire time and we could visually see our position to it. We stayed at that altitude a few seconds and then continued the approach without further incident to a normal landing. We could not understand the sudden warning as our training always demonstrates this system to work by first advising of a potential conflict and then strengthening in warning until finally commanding a pull up. We got no advisories or other preliminary warnings-just the very sudden pull up; and just as sudden ending of it. There was no corresponding red display as we have seen in the simulator with the aural command. At no time did ATC mention anything about our altitude.

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Original NASA ASRS Text

Title: A320 flight crew reported receiving a 'Terrain; pull up' warning from the EGPWS on a visual approach to LAS RW 1R that appeared to be inaccurate.

Narrative: We were offered a visual to Runway 1R instead of 25L as winds were from the north at 15 knots. We accepted vectors for the 1R visual. The First Officer disconnected the autopilot somewhere south of the airport in a dogleg turn about 25-30 south. We reported the airport in sight just prior to that point and were cleared for a visual to 1R without other airspeed or altitude clearance. We were at 7;000 feet and 210 knots. I then put 3;500 feet in the altitude window as the First Officer had a reference point in the FMGC to the runway giving us a 3 degree glideslope for reference. I had the 1R RNAV approach plate in front of me and saw that we should have been at 5;000 feet at 10 NM. We were on that profile inside of 15 NM and I spoke with the Tower during this time and noticed we were going to cross the 10 nm point just below 5;000 feet. Before I started to mention it; we received an EGPWS warning 'TERRAIN; TERRAIN; PULL UP; PULL UP'. It lasted about 2-3 seconds. I believe we reached 4;800 feet or slightly above at this time at about 10.5 nm. The First Officer began to start a climb and as we were at level and he put his hands on the levers; the warning stopped after one cycle. There was some sparse green terrain on our displays the entire time and we could visually see our position to it. We stayed at that altitude a few seconds and then continued the approach without further incident to a normal landing. We could not understand the sudden warning as our training always demonstrates this system to work by first advising of a potential conflict and then strengthening in warning until finally commanding a pull up. We got no advisories or other preliminary warnings-just the very sudden pull up; and just as sudden ending of it. There was no corresponding red display as we have seen in the simulator with the aural command. At no time did ATC mention anything about our altitude.

Data retrieved from NASA's ASRS site as of July 2013 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.