Narrative:

At about 10-15 KTS prior to V1 we felt something unusual -- like we hit something -- ran over something on runway. Everything else was normal. We rotated and the first officer asked the tower if they noticed anything abnormal with the takeoff. They said no, so we brought the gear up and shortly afterwards, lost B system hydraulic pressure and quantity. We asked for a fly-by of the tower to have them look at gear, declared an emergency and flew to 10000 ft to dump fuel. We called the head flight attendant up to advise her of situation and have them prepare cabin for landing. I called company to advise them of our situation and began to read the abnormal checklist for review (while dumping approximately 18000 pounds of fuel to get plane as light as possible). The captain flew the plane, first officer worked radios. Tower advised the #2 left main tire blew, then we proceeded with abnormal checklist and set up to land on 35R. We landed at about 140000 pounds. Landing was successful. No evacuate/evacuation required. We shut down engines and maintenance towed us off runway. I did notice the brakes were warmer than usual during my preflight. It was 88 degrees that day. I advised the captain, he looked at them and asked maintenance to check on them. There was no logbook write-up from crew bringing aircraft into den that they'd exceeded the minimum quick turn weight, and besides, we were on the ground in excess of the 44 mins required by the chart anyway. Supplemental information from acn 249547: determined blown tire tore a line in hydraulics to the brake.

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Original NASA ASRS Text

Title: FUEL DUMPED AND LGT RETURN LAND AFTER BLOWN TIRE ON TKOF.

Narrative: AT ABOUT 10-15 KTS PRIOR TO V1 WE FELT SOMETHING UNUSUAL -- LIKE WE HIT SOMETHING -- RAN OVER SOMETHING ON RWY. EVERYTHING ELSE WAS NORMAL. WE ROTATED AND THE FO ASKED THE TWR IF THEY NOTICED ANYTHING ABNORMAL WITH THE TKOF. THEY SAID NO, SO WE BROUGHT THE GEAR UP AND SHORTLY AFTERWARDS, LOST B SYS HYD PRESSURE AND QUANTITY. WE ASKED FOR A FLY-BY OF THE TWR TO HAVE THEM LOOK AT GEAR, DECLARED AN EMER AND FLEW TO 10000 FT TO DUMP FUEL. WE CALLED THE HEAD FLT ATTENDANT UP TO ADVISE HER OF SIT AND HAVE THEM PREPARE CABIN FOR LNDG. I CALLED COMPANY TO ADVISE THEM OF OUR SIT AND BEGAN TO READ THE ABNORMAL CHKLIST FOR REVIEW (WHILE DUMPING APPROX 18000 LBS OF FUEL TO GET PLANE AS LIGHT AS POSSIBLE). THE CAPT FLEW THE PLANE, FO WORKED RADIOS. TWR ADVISED THE #2 L MAIN TIRE BLEW, THEN WE PROCEEDED WITH ABNORMAL CHKLIST AND SET UP TO LAND ON 35R. WE LANDED AT ABOUT 140000 LBS. LNDG WAS SUCCESSFUL. NO EVAC REQUIRED. WE SHUT DOWN ENGS AND MAINT TOWED US OFF RWY. I DID NOTICE THE BRAKES WERE WARMER THAN USUAL DURING MY PREFLT. IT WAS 88 DEGS THAT DAY. I ADVISED THE CAPT, HE LOOKED AT THEM AND ASKED MAINT TO CHK ON THEM. THERE WAS NO LOGBOOK WRITE-UP FROM CREW BRINGING ACFT INTO DEN THAT THEY'D EXCEEDED THE MINIMUM QUICK TURN WT, AND BESIDES, WE WERE ON THE GND IN EXCESS OF THE 44 MINS REQUIRED BY THE CHART ANYWAY. SUPPLEMENTAL INFO FROM ACN 249547: DETERMINED BLOWN TIRE TORE A LINE IN HYDS TO THE BRAKE.

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.