Narrative:

After flying a normal approach to landing at waukegan regional (ugn), I deployed spoilers and thrust reversers to slow the aircraft. After the aircraft slowed from 126 KTS (vref) to about 100 KTS, the aircraft began to turn from right to left. I tried to control the aircraft's uncommanded turns with differential braking, as the nosewheel steering was inoperative and MEL'ed. However, I was unable to regain control and the aircraft departed the right side of runway 5 at ugn, about 3000 ft from the approach end. WX at ugn was 040 degrees at 13 KTS, gusting to 18 KTS, clear and 10 SM visibility, altimeter 30.28. Under these conditions and complying with all MEL requirements, landing was believed to be safe. Although I don't believe the nosewheel steering inoperative was the cause of the incident, I do believe it limited my ability to regain control of the aircraft. There was no damage to aircraft or property. No one was injured. Supplemental information from acn 573898: after touchdown at ugn, the captain and I were using standard company calls with the spoilers being deployed and the thrust reversers being deployed. The field conditions were dry and clear. We had to add an additional 2% to the landing distance due to the nosewheel steering being MEL'ed. All factors were briefed and verified to landing with no nose steering. I think the factors that contributed to this incident were the nosewheel being MEL'ed and the unexplainable reason it started to sway unctlably.

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Original NASA ASRS Text

Title: CL60 CREW LOST ACFT CTL AFTER LNDG AND WENT OFF THE R SIDE OF THE RWY. THE NOSE STEERING SYS WAS MEL'ED INOP.

Narrative: AFTER FLYING A NORMAL APCH TO LNDG AT WAUKEGAN REGIONAL (UGN), I DEPLOYED SPOILERS AND THRUST REVERSERS TO SLOW THE ACFT. AFTER THE ACFT SLOWED FROM 126 KTS (VREF) TO ABOUT 100 KTS, THE ACFT BEGAN TO TURN FROM R TO L. I TRIED TO CTL THE ACFT'S UNCOMMANDED TURNS WITH DIFFERENTIAL BRAKING, AS THE NOSEWHEEL STEERING WAS INOP AND MEL'ED. HOWEVER, I WAS UNABLE TO REGAIN CTL AND THE ACFT DEPARTED THE R SIDE OF RWY 5 AT UGN, ABOUT 3000 FT FROM THE APCH END. WX AT UGN WAS 040 DEGS AT 13 KTS, GUSTING TO 18 KTS, CLR AND 10 SM VISIBILITY, ALTIMETER 30.28. UNDER THESE CONDITIONS AND COMPLYING WITH ALL MEL REQUIREMENTS, LNDG WAS BELIEVED TO BE SAFE. ALTHOUGH I DON'T BELIEVE THE NOSEWHEEL STEERING INOP WAS THE CAUSE OF THE INCIDENT, I DO BELIEVE IT LIMITED MY ABILITY TO REGAIN CTL OF THE ACFT. THERE WAS NO DAMAGE TO ACFT OR PROPERTY. NO ONE WAS INJURED. SUPPLEMENTAL INFO FROM ACN 573898: AFTER TOUCHDOWN AT UGN, THE CAPT AND I WERE USING STANDARD COMPANY CALLS WITH THE SPOILERS BEING DEPLOYED AND THE THRUST REVERSERS BEING DEPLOYED. THE FIELD CONDITIONS WERE DRY AND CLR. WE HAD TO ADD AN ADDITIONAL 2% TO THE LNDG DISTANCE DUE TO THE NOSEWHEEL STEERING BEING MEL'ED. ALL FACTORS WERE BRIEFED AND VERIFIED TO LNDG WITH NO NOSE STEERING. I THINK THE FACTORS THAT CONTRIBUTED TO THIS INCIDENT WERE THE NOSEWHEEL BEING MEL'ED AND THE UNEXPLAINABLE REASON IT STARTED TO SWAY UNCTLABLY.

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.