Narrative:

We were cleared for an approach to runway 25L and then approach changed us to runway 19L. We were on a good heading for a left dogleg to runway 19L. Approach cleared us for a visual after calling the field in sight. I was not familiar with las but acquired the runway with the captain's help and continued the approach rolling out on final about 2 mi and slightly high. I noticed a red blinking light on the runway centerline in line with the REIL and asked the captain what it was. He didn't know or thought it might be a car or truck. About the same time I was beginning to get concerned and was considering going around, the light started to move to the right and away from the runway. I assumed it was a vehicle (truck or van) servicing the lighting system. I did not notice any wingtip lights. Tower later told the captain it was a student pilot in a light plane. During the short time all this transpired, I asked the captain if we were cleared to land. I remembered his calling the landing check complete but I wasn't sure about whether approach had given us a landing clearance or just sent us to tower. He tried several times to get the tower, but was not able to get a reply. I assumed we had been cleared to land at this point as the runway was clear and we had talked to someone (tower or approach) about landing. The landing was uneventful, but we did have trouble getting ground control. We had had a stuck microphone also earlier on that same radio. (Note: we had no approach plates for runway 19L, no missed approach procedure, and there were simultaneous takeoffs and lndgs on runways 25.) (the captain talked with tower by telephone from operations.) (in my judgement, I felt that landing would be safer than going around.)

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Original NASA ASRS Text

Title: B757-200 LANDS WITHOUT CLRNC.

Narrative: WE WERE CLRED FOR AN APCH TO RWY 25L AND THEN APCH CHANGED US TO RWY 19L. WE WERE ON A GOOD HDG FOR A L DOGLEG TO RWY 19L. APCH CLRED US FOR A VISUAL AFTER CALLING THE FIELD IN SIGHT. I WAS NOT FAMILIAR WITH LAS BUT ACQUIRED THE RWY WITH THE CAPT'S HELP AND CONTINUED THE APCH ROLLING OUT ON FINAL ABOUT 2 MI AND SLIGHTLY HIGH. I NOTICED A RED BLINKING LIGHT ON THE RWY CTRLINE IN LINE WITH THE REIL AND ASKED THE CAPT WHAT IT WAS. HE DIDN'T KNOW OR THOUGHT IT MIGHT BE A CAR OR TRUCK. ABOUT THE SAME TIME I WAS BEGINNING TO GET CONCERNED AND WAS CONSIDERING GOING AROUND, THE LIGHT STARTED TO MOVE TO THE R AND AWAY FROM THE RWY. I ASSUMED IT WAS A VEHICLE (TRUCK OR VAN) SVCING THE LIGHTING SYS. I DID NOT NOTICE ANY WINGTIP LIGHTS. TWR LATER TOLD THE CAPT IT WAS A STUDENT PLT IN A LIGHT PLANE. DURING THE SHORT TIME ALL THIS TRANSPIRED, I ASKED THE CAPT IF WE WERE CLRED TO LAND. I REMEMBERED HIS CALLING THE LNDG CHK COMPLETE BUT I WASN'T SURE ABOUT WHETHER APCH HAD GIVEN US A LNDG CLRNC OR JUST SENT US TO TWR. HE TRIED SEVERAL TIMES TO GET THE TWR, BUT WAS NOT ABLE TO GET A REPLY. I ASSUMED WE HAD BEEN CLRED TO LAND AT THIS POINT AS THE RWY WAS CLR AND WE HAD TALKED TO SOMEONE (TWR OR APCH) ABOUT LNDG. THE LNDG WAS UNEVENTFUL, BUT WE DID HAVE TROUBLE GETTING GND CTL. WE HAD HAD A STUCK MIKE ALSO EARLIER ON THAT SAME RADIO. (NOTE: WE HAD NO APCH PLATES FOR RWY 19L, NO MISSED APCH PROC, AND THERE WERE SIMULTANEOUS TKOFS AND LNDGS ON RWYS 25.) (THE CAPT TALKED WITH TWR BY TELEPHONE FROM OPS.) (IN MY JUDGEMENT, I FELT THAT LNDG WOULD BE SAFER THAN GOING AROUND.)

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.