Narrative:

While taxiing into position for takeoff on runway 35R dfw, aircraft nose wheel departed the right side of the runway. Steering, braking and directional control were lost at approximately 30 degrees into runway turn on due to 1/4-1/2' of clear glaze ice covering the threshold and #south of runway 35R. No damage was sustained to aircraft. No human injuries, and no airport facility damage was reported at the time of the incident, or as of the date of this report. Aircraft gross weight at the time of the incident was 110000# and both engines were at idle power during taxi onto the runway. Flight taxied via normal instruction to runway 35L for takeoff. Upon arrival at the hold line (35L), tower closed 35L for inspection and changed departure runway to 35R (which had been a landing runway throughout the day). During taxi into position (after having been cleared for takeoff), it became apparently through loss of directional control and braking that this portion of the runway had not been deiced or sanded. Captain initiated braking, steering and reverse thrust in an attempt to control and stop the aircraft. The aircraft slid slowly from west to east, on an approximately 30 degree diagonal vector across runway 35R threshold area, where the nose wheel departed the runway edge, stopping aircraft momentum. All responding parties and crew witnessed and concur that the threshold and #south area of the approach end of runway 35R were covered and glazed with approximately 1/4-1/2' of clear ice. No presence of deicing fluid or sand was discovered or apparent. All vehs that responded had difficulty with braking and directional control. Dfw NOTAMS claimed runway 35R had been deiced 100' wide (did not specify length). If the end in question had been deiced, it was neither apparent nor effectual; no sand present in ice formation immediately after the incident. It is the opinion of the crew of having landed 1 hour previously on runway 35R, that the area of normal T/D was clear of ice from a combination of repeated use and deicing. The first 1000' (prior to T/D area), however, had been west/O traffic for an extended period of time, and had been unattended and became unknowingly ice covered. Supplemental information from acn 167169: from flight plan, 'dfw NOTAM 17L-35R deiced liquid 100' wide.' it was apparent that if deicing fluid had been applied, it had been long before our attempted departure. It was also obvious that the end of the runway had not been sanded at all, as no sand was present immediately after the incident. The area was sanded following to accommodate the passenger exit and recovery efforts for the aircraft.

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Original NASA ASRS Text

Title: ACR MLG SLIDES OFF RWY AS HE IS CLEARED INTO FOR POSITION FOR TKOF. UNREPORTED ICE ON RWY.

Narrative: WHILE TAXIING INTO POS FOR TKOF ON RWY 35R DFW, ACFT NOSE WHEEL DEPARTED THE RIGHT SIDE OF THE RWY. STEERING, BRAKING AND DIRECTIONAL CTL WERE LOST AT APPROX 30 DEGS INTO RWY TURN ON DUE TO 1/4-1/2' OF CLEAR GLAZE ICE COVERING THE THRESHOLD AND #S OF RWY 35R. NO DAMAGE WAS SUSTAINED TO ACFT. NO HUMAN INJURIES, AND NO ARPT FAC DAMAGE WAS RPTED AT THE TIME OF THE INCIDENT, OR AS OF THE DATE OF THIS RPT. ACFT GROSS WT AT THE TIME OF THE INCIDENT WAS 110000# AND BOTH ENGS WERE AT IDLE PWR DURING TAXI ONTO THE RWY. FLT TAXIED VIA NORMAL INSTRUCTION TO RWY 35L FOR TKOF. UPON ARR AT THE HOLD LINE (35L), TWR CLOSED 35L FOR INSPECTION AND CHANGED DEP RWY TO 35R (WHICH HAD BEEN A LNDG RWY THROUGHOUT THE DAY). DURING TAXI INTO POS (AFTER HAVING BEEN CLRED FOR TKOF), IT BECAME APPARENTLY THROUGH LOSS OF DIRECTIONAL CTL AND BRAKING THAT THIS PORTION OF THE RWY HAD NOT BEEN DEICED OR SANDED. CAPT INITIATED BRAKING, STEERING AND REVERSE THRUST IN AN ATTEMPT TO CTL AND STOP THE ACFT. THE ACFT SLID SLOWLY FROM W TO E, ON AN APPROX 30 DEG DIAGONAL VECTOR ACROSS RWY 35R THRESHOLD AREA, WHERE THE NOSE WHEEL DEPARTED THE RWY EDGE, STOPPING ACFT MOMENTUM. ALL RESPONDING PARTIES AND CREW WITNESSED AND CONCUR THAT THE THRESHOLD AND #S AREA OF THE APCH END OF RWY 35R WERE COVERED AND GLAZED WITH APPROX 1/4-1/2' OF CLR ICE. NO PRESENCE OF DEICING FLUID OR SAND WAS DISCOVERED OR APPARENT. ALL VEHS THAT RESPONDED HAD DIFFICULTY WITH BRAKING AND DIRECTIONAL CTL. DFW NOTAMS CLAIMED RWY 35R HAD BEEN DEICED 100' WIDE (DID NOT SPECIFY LENGTH). IF THE END IN QUESTION HAD BEEN DEICED, IT WAS NEITHER APPARENT NOR EFFECTUAL; NO SAND PRESENT IN ICE FORMATION IMMEDIATELY AFTER THE INCIDENT. IT IS THE OPINION OF THE CREW OF HAVING LANDED 1 HR PREVIOUSLY ON RWY 35R, THAT THE AREA OF NORMAL T/D WAS CLR OF ICE FROM A COMBINATION OF REPEATED USE AND DEICING. THE FIRST 1000' (PRIOR TO T/D AREA), HOWEVER, HAD BEEN W/O TFC FOR AN EXTENDED PERIOD OF TIME, AND HAD BEEN UNATTENDED AND BECAME UNKNOWINGLY ICE COVERED. SUPPLEMENTAL INFO FROM ACN 167169: FROM FLT PLAN, 'DFW NOTAM 17L-35R DEICED LIQUID 100' WIDE.' IT WAS APPARENT THAT IF DEICING FLUID HAD BEEN APPLIED, IT HAD BEEN LONG BEFORE OUR ATTEMPTED DEP. IT WAS ALSO OBVIOUS THAT THE END OF THE RWY HAD NOT BEEN SANDED AT ALL, AS NO SAND WAS PRESENT IMMEDIATELY AFTER THE INCIDENT. THE AREA WAS SANDED FOLLOWING TO ACCOMMODATE THE PAX EXIT AND RECOVERY EFFORTS FOR THE ACFT.

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.