Narrative:

During takeoff runway 32 extension at anc airport, the crew heard a loud thump at approximately 140 KIAS, followed by a heavy vibration. Aircraft seemed to accelerate slower than normal during this vibration. Crew aborted takeoff at 148 KIAS (V1 = 164 KTS). Aircraft was stopped approximately 200 ft into clearway end runway 32. Aircraft had blown 2 main tires with tire FOD causing hydraulic system failure and damage to right inboard flap. With reference to runway accelerate stop distance -- V1 speed and remaining available runway, an area for further study could be stopping distance with blown tires thereby reducing the number of effective brakes. Also, acceleration to V1 speed with blown tires slowing the aircraft thereby moving the V speeds further down the runway resulting in unbalanced runway length.

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Original NASA ASRS Text

Title: B747 CREW HAD BLOWN TIRES ON TKOF AT ANC.

Narrative: DURING TKOF RWY 32 EXTENSION AT ANC ARPT, THE CREW HEARD A LOUD THUMP AT APPROX 140 KIAS, FOLLOWED BY A HVY VIBRATION. ACFT SEEMED TO ACCELERATE SLOWER THAN NORMAL DURING THIS VIBRATION. CREW ABORTED TKOF AT 148 KIAS (V1 = 164 KTS). ACFT WAS STOPPED APPROX 200 FT INTO CLEARWAY END RWY 32. ACFT HAD BLOWN 2 MAIN TIRES WITH TIRE FOD CAUSING HYD SYS FAILURE AND DAMAGE TO R INBOARD FLAP. WITH REF TO RWY ACCELERATE STOP DISTANCE -- V1 SPD AND REMAINING AVAILABLE RWY, AN AREA FOR FURTHER STUDY COULD BE STOPPING DISTANCE WITH BLOWN TIRES THEREBY REDUCING THE NUMBER OF EFFECTIVE BRAKES. ALSO, ACCELERATION TO V1 SPD WITH BLOWN TIRES SLOWING THE ACFT THEREBY MOVING THE V SPDS FURTHER DOWN THE RWY RESULTING IN UNBALANCED RWY LENGTH.

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.