Narrative:

Revenue flight in EMB120, first flight of the day. Picked up aircraft at hangar and completed all preflight, start, and taxi checks. While taxiing to gate, conducted both manual and automatic-feather checks -- all normal. After loading passenger and departing gate, conducted automatic-feather check again -- normal. Cleared 'position and hold' behind departing B757. Clearance to takeoff received after B757 began departure turn. Held brakes, noted np increasing toward 100 percent, released brakes, and called for 100 percent torque (which is used on first flight of day). Shortly after takeoff roll began, both PF and PNF noted unusual sound from #2 propeller and initiated abort. PF noted #2 torque at 125 percent as power levers were being reduced to idle. Aircraft cleared runway without incident. With both power levers at idle and both condition levers at minimum, #2 nh was at 84 percent and np at 43 percent. Only after #2 condition lever was moved to feather would #2 nh drop to 62 percent -- normal idle speed. We taxied back to gate and turned aircraft over to maintenance. Conversation with chief pilot revealed that maintenance personnel conducted test run of right engine. I noted that when right propeller was feathered, then unfeathered, it took approximately 4 mins for propeller RPM to return to normal. Maintenance records showed following work performed: computer downloaded and overtorque of 132 percent noted. Propeller control unit changed, torque control unit changed, propeller changed, overtorque inspection completed. I do not know the time interval the computer showed when takeoff power was added and abort initiated, but think it was reasonably short. I thought np indications were normal until propeller began to feather.

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Original NASA ASRS Text

Title: TKOF ABORTED.

Narrative: REVENUE FLT IN EMB120, FIRST FLT OF THE DAY. PICKED UP ACFT AT HANGAR AND COMPLETED ALL PREFLT, START, AND TAXI CHKS. WHILE TAXIING TO GATE, CONDUCTED BOTH MANUAL AND AUTO-FEATHER CHKS -- ALL NORMAL. AFTER LOADING PAX AND DEPARTING GATE, CONDUCTED AUTO-FEATHER CHK AGAIN -- NORMAL. CLRED 'POS AND HOLD' BEHIND DEPARTING B757. CLRNC TO TKOF RECEIVED AFTER B757 BEGAN DEP TURN. HELD BRAKES, NOTED NP INCREASING TOWARD 100 PERCENT, RELEASED BRAKES, AND CALLED FOR 100 PERCENT TORQUE (WHICH IS USED ON FIRST FLT OF DAY). SHORTLY AFTER TKOF ROLL BEGAN, BOTH PF AND PNF NOTED UNUSUAL SOUND FROM #2 PROP AND INITIATED ABORT. PF NOTED #2 TORQUE AT 125 PERCENT AS PWR LEVERS WERE BEING REDUCED TO IDLE. ACFT CLRED RWY WITHOUT INCIDENT. WITH BOTH PWR LEVERS AT IDLE AND BOTH CONDITION LEVERS AT MINIMUM, #2 NH WAS AT 84 PERCENT AND NP AT 43 PERCENT. ONLY AFTER #2 CONDITION LEVER WAS MOVED TO FEATHER WOULD #2 NH DROP TO 62 PERCENT -- NORMAL IDLE SPD. WE TAXIED BACK TO GATE AND TURNED ACFT OVER TO MAINT. CONVERSATION WITH CHIEF PLT REVEALED THAT MAINT PERSONNEL CONDUCTED TEST RUN OF R ENG. I NOTED THAT WHEN R PROP WAS FEATHERED, THEN UNFEATHERED, IT TOOK APPROX 4 MINS FOR PROP RPM TO RETURN TO NORMAL. MAINT RECORDS SHOWED FOLLOWING WORK PERFORMED: COMPUTER DOWNLOADED AND OVERTORQUE OF 132 PERCENT NOTED. PROP CTL UNIT CHANGED, TORQUE CTL UNIT CHANGED, PROP CHANGED, OVERTORQUE INSPECTION COMPLETED. I DO NOT KNOW THE TIME INTERVAL THE COMPUTER SHOWED WHEN TKOF PWR WAS ADDED AND ABORT INITIATED, BUT THINK IT WAS REASONABLY SHORT. I THOUGHT NP INDICATIONS WERE NORMAL UNTIL PROP BEGAN TO FEATHER.

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.