Narrative:

We were on approach into las. Coming through about 8000 ft, we called runway 1L in sight. We were cleared to a visual approach but were asked by ATC to hold 230 KTS (fast for this point on the approach). To compensate for the extra speed, I flew the approach slightly low. At about 4500 ft we got a 'terrain, pull up' GPWS warning. Although we had clear line of sight to the runway, we initiated an immediate climb. By the time we were done with the response (the warning silencing) we were well above glide path. A normal landing followed. It should be noted that we had an ATC (tower controller) in the jump seat. Both he and the first officer wondered if it may have been an erroneous warning, because we appeared to be clear of all terrain. If it was indeed an accurate warning, I'm glad we had the GPWS on board.

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Original NASA ASRS Text

Title: CAPT OF AN MLG CLBED IN RESPONSE TO A GPWS WARNING DURING A VISUAL APCH.

Narrative: WE WERE ON APCH INTO LAS. COMING THROUGH ABOUT 8000 FT, WE CALLED RWY 1L IN SIGHT. WE WERE CLRED TO A VISUAL APCH BUT WERE ASKED BY ATC TO HOLD 230 KTS (FAST FOR THIS POINT ON THE APCH). TO COMPENSATE FOR THE EXTRA SPD, I FLEW THE APCH SLIGHTLY LOW. AT ABOUT 4500 FT WE GOT A 'TERRAIN, PULL UP' GPWS WARNING. ALTHOUGH WE HAD CLR LINE OF SIGHT TO THE RWY, WE INITIATED AN IMMEDIATE CLB. BY THE TIME WE WERE DONE WITH THE RESPONSE (THE WARNING SILENCING) WE WERE WELL ABOVE GLIDE PATH. A NORMAL LNDG FOLLOWED. IT SHOULD BE NOTED THAT WE HAD AN ATC (TWR CTLR) IN THE JUMP SEAT. BOTH HE AND THE FO WONDERED IF IT MAY HAVE BEEN AN ERRONEOUS WARNING, BECAUSE WE APPEARED TO BE CLR OF ALL TERRAIN. IF IT WAS INDEED AN ACCURATE WARNING, I'M GLAD WE HAD THE GPWS ON BOARD.

Data retrieved from NASA's ASRS site as of July 2007 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.