Narrative:

While departing den runway 17R; a large flock of birds took flight and crossed the runway resulting in several bird strikes on the aircraft fuselage and engines. The right engine experienced compressor stalls; and the takeoff was aborted prior to V1; at approximately 135 KIAS. WX at the time was clear; visibility unrestr; wind approximately 120 degrees/7 KTS. The birds were to the right side of the runway in the grass when they were first observed taking off. Their flight pattern took them directly across the runway towards the center; then they turned south; directly down the runway in the same direction we were departing. The type of bird is unknown; but they were of the same size as a grapefruit; possibly quail or pigeons. Their flight path kept them low; no higher than the top of the fuselage (20-25 ft off the ground maximum); resulting in the center of mass of the flock being between 10-15 ft above the runway; almost in line with the engines and wings. We observed the birds passing the cockpit windows with no strikes; we then felt and heard 3 distinct popping sounds; likely the compressor stalls. Passenger sitting along the right side windows aft of the wing observed a momentary flash of flame seconds prior to our abort; which also coincides with the compressor stall due to the bird ingestion. The decision to abort the takeoff was made due to the numbers of birds observed and the clear engine ingestion with the compressor stalls. Engine performance appeared normal; but it was unclr whether both engines were impacted; and the decision was made assuming both engines had received strikes. Planned V1 was 146 KIAS; and the decision to abort was made at approximately 130 KIAS; and maximum speed likely approached 135-140 KIAS before maximum braking was initiated. After clearing the runway on M5; the aircraft was brought to a stop; all checklists were accomplished for rejected takeoff; after landing; and brake temperature. The passenger and den tower and ground were notified of our intentions; and the aircraft returned to the gate with no further assistance required. Postflt maintenance inspection revealed bird strikes in both engines; the right engine receiving a strike which entered the compressor section while the left engine showed evidence of a bird strike that went through the high bypass section and out the back of the engine. The flight was canceled due to the need to borescope the right engine and the flight crew were relieved of duty.

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Original NASA ASRS Text

Title: B757 FLT CREW HAS MULTIPLE BIRD STRIKES DURING TKOF AND REJECTS AT 135 KNOTS.

Narrative: WHILE DEPARTING DEN RWY 17R; A LARGE FLOCK OF BIRDS TOOK FLT AND CROSSED THE RWY RESULTING IN SEVERAL BIRD STRIKES ON THE ACFT FUSELAGE AND ENGS. THE R ENG EXPERIENCED COMPRESSOR STALLS; AND THE TKOF WAS ABORTED PRIOR TO V1; AT APPROX 135 KIAS. WX AT THE TIME WAS CLR; VISIBILITY UNRESTR; WIND APPROX 120 DEGS/7 KTS. THE BIRDS WERE TO THE R SIDE OF THE RWY IN THE GRASS WHEN THEY WERE FIRST OBSERVED TAKING OFF. THEIR FLT PATTERN TOOK THEM DIRECTLY ACROSS THE RWY TOWARDS THE CTR; THEN THEY TURNED S; DIRECTLY DOWN THE RWY IN THE SAME DIRECTION WE WERE DEPARTING. THE TYPE OF BIRD IS UNKNOWN; BUT THEY WERE OF THE SAME SIZE AS A GRAPEFRUIT; POSSIBLY QUAIL OR PIGEONS. THEIR FLT PATH KEPT THEM LOW; NO HIGHER THAN THE TOP OF THE FUSELAGE (20-25 FT OFF THE GND MAX); RESULTING IN THE CTR OF MASS OF THE FLOCK BEING BTWN 10-15 FT ABOVE THE RWY; ALMOST IN LINE WITH THE ENGS AND WINGS. WE OBSERVED THE BIRDS PASSING THE COCKPIT WINDOWS WITH NO STRIKES; WE THEN FELT AND HEARD 3 DISTINCT POPPING SOUNDS; LIKELY THE COMPRESSOR STALLS. PAX SITTING ALONG THE R SIDE WINDOWS AFT OF THE WING OBSERVED A MOMENTARY FLASH OF FLAME SECONDS PRIOR TO OUR ABORT; WHICH ALSO COINCIDES WITH THE COMPRESSOR STALL DUE TO THE BIRD INGESTION. THE DECISION TO ABORT THE TKOF WAS MADE DUE TO THE NUMBERS OF BIRDS OBSERVED AND THE CLR ENG INGESTION WITH THE COMPRESSOR STALLS. ENG PERFORMANCE APPEARED NORMAL; BUT IT WAS UNCLR WHETHER BOTH ENGS WERE IMPACTED; AND THE DECISION WAS MADE ASSUMING BOTH ENGS HAD RECEIVED STRIKES. PLANNED V1 WAS 146 KIAS; AND THE DECISION TO ABORT WAS MADE AT APPROX 130 KIAS; AND MAX SPD LIKELY APCHED 135-140 KIAS BEFORE MAX BRAKING WAS INITIATED. AFTER CLRING THE RWY ON M5; THE ACFT WAS BROUGHT TO A STOP; ALL CHKLISTS WERE ACCOMPLISHED FOR REJECTED TKOF; AFTER LNDG; AND BRAKE TEMP. THE PAX AND DEN TWR AND GND WERE NOTIFIED OF OUR INTENTIONS; AND THE ACFT RETURNED TO THE GATE WITH NO FURTHER ASSISTANCE REQUIRED. POSTFLT MAINT INSPECTION REVEALED BIRD STRIKES IN BOTH ENGS; THE R ENG RECEIVING A STRIKE WHICH ENTERED THE COMPRESSOR SECTION WHILE THE L ENG SHOWED EVIDENCE OF A BIRD STRIKE THAT WENT THROUGH THE HIGH BYPASS SECTION AND OUT THE BACK OF THE ENG. THE FLT WAS CANCELED DUE TO THE NEED TO BORESCOPE THE R ENG AND THE FLT CREW WERE RELIEVED OF DUTY.

Data retrieved from NASA's ASRS site as of January 2009 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.