Air carrier large transport has to abort takeoff at dfw when aircraft veers to the left as a result of a dragging brake. At the same time, flight crew was unable to raise flaps due to problem with the generator constant speed drive.

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Attributes
ACN	142695
Time
Date	199004
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 3000 flight time type : 180
ASRS Report	142695
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Normal preflight/walkaround accomplished. Found #1 and #2 main gear tire needed inspection. Maintenance notified and changed tire. Normal taxi out and on to runway. During runup vibrations felt. Much above, normal. No EPR egt problems seen. Retarded throttles to idle. Again runup indications all normal. At approximately 60-65 KTS during takeoff roll, aircraft veered left. Required a takeoff abort. Cleared runway, then #1 buss tie light came on. Completed position manual instructions. During taxi-in unable to raise flaps for 5-10 mins after occurrence. Callback conversation with reporter revealed the following: reporter said that 2 problems were discovered in the wake of the incident. The first was that the aircraft had already been written up for a dragging brake. Post-flight inspection also revealed a problem with the constant speed drive (CSD) on the generator. Reporter surmises that the electrical problem and the vibration during runup are attributable to the CSD problem, while the dragging brake caused the aircraft to veer to the left during the takeoff roll.

Original NASA ASRS Text

Title: ACR LGT HAS TO ABORT TKOF AT DFW WHEN ACFT VEERS TO THE LEFT AS A RESULT OF A DRAGGING BRAKE. AT THE SAME TIME, FLT CREW WAS UNABLE TO RAISE FLAPS DUE TO PROBLEM WITH THE GENERATOR CONSTANT SPEED DRIVE.

Narrative: NORMAL PREFLT/WALKAROUND ACCOMPLISHED. FOUND #1 AND #2 MAIN GEAR TIRE NEEDED INSPECTION. MAINT NOTIFIED AND CHANGED TIRE. NORMAL TAXI OUT AND ON TO RWY. DURING RUNUP VIBRATIONS FELT. MUCH ABOVE, NORMAL. NO EPR EGT PROBS SEEN. RETARDED THROTTLES TO IDLE. AGAIN RUNUP INDICATIONS ALL NORMAL. AT APPROX 60-65 KTS DURING TKOF ROLL, ACFT VEERED LEFT. REQUIRED A TKOF ABORT. CLRED RWY, THEN #1 BUSS TIE LIGHT CAME ON. COMPLETED POS MANUAL INSTRUCTIONS. DURING TAXI-IN UNABLE TO RAISE FLAPS FOR 5-10 MINS AFTER OCCURRENCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR SAID THAT 2 PROBS WERE DISCOVERED IN THE WAKE OF THE INCIDENT. THE FIRST WAS THAT THE ACFT HAD ALREADY BEEN WRITTEN UP FOR A DRAGGING BRAKE. POST-FLT INSPECTION ALSO REVEALED A PROBLEM WITH THE CONSTANT SPD DRIVE (CSD) ON THE GENERATOR. REPORTER SURMISES THAT THE ELECTRICAL PROBLEM AND THE VIBRATION DURING RUNUP ARE ATTRIBUTABLE TO THE CSD PROB, WHILE THE DRAGGING BRAKE CAUSED THE ACFT TO VEER TO THE LEFT DURING THE TKOF ROLL.

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.