LR25 crew became disabled on runway when nosewheel steering failed.

Attributes
ACN	422057
Time
Date	199812
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdw
State Reference	IL
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	Learjet 25
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : cfi
Experience	flight time last 90 days : 360 flight time total : 5100 flight time type : 1700
ASRS Report	422057
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	aircraft equipment problem : critical conflict : ground less severe other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	faa : reviewed incident with flight crew Other
Supplementary
Air Traffic Incident	other

Narrative:

On dec/xa/98 we had a glitch in our nosewheel steering at mdw airport that required us to call the tower supervisor after landing. Landing runway 31C, we had traffic on final behind us and traffic in position and hold on the runway. In attempting to taxi clear of runway 31C at runway 22R, our nosewheel steering failed. We came to a complete stop on the active runway, while attempting to make a near 90 degree left turn on runway 22R. Trying to use differential power and braking was not working so we pulled the aircraft nosewheel steering circuit breaker and then was able to use differential power and braking to make the turn. In the short time period we were stopped on the runway, the copilot thought that we could make a right turn, which he conveyed to ATC. In reality, we could make no turns. ATC made the aircraft in position and hold behind us taxi clear of the runway. We were clear of the active runway before there was a conflict with the landing traffic. We reset the aircraft nosewheel steering circuit breaker and could not duplicate the problem. In consulting with maintenance after landing, it was determined the glitch was probably due to the large amount of rain we had flown through just prior to landing, contaminating a cannon plug in the nosewheel well that controls the nosewheel steering. By the way, we were operating under far part 91 to achieve a part 135 flight, ie, picking up freight at mdw.

Original NASA ASRS Text

Title: LR25 CREW BECAME DISABLED ON RWY WHEN NOSEWHEEL STEERING FAILED.

Narrative: ON DEC/XA/98 WE HAD A GLITCH IN OUR NOSEWHEEL STEERING AT MDW ARPT THAT REQUIRED US TO CALL THE TWR SUPVR AFTER LNDG. LNDG RWY 31C, WE HAD TFC ON FINAL BEHIND US AND TFC IN POS AND HOLD ON THE RWY. IN ATTEMPTING TO TAXI CLR OF RWY 31C AT RWY 22R, OUR NOSEWHEEL STEERING FAILED. WE CAME TO A COMPLETE STOP ON THE ACTIVE RWY, WHILE ATTEMPTING TO MAKE A NEAR 90 DEG L TURN ON RWY 22R. TRYING TO USE DIFFERENTIAL PWR AND BRAKING WAS NOT WORKING SO WE PULLED THE ACFT NOSEWHEEL STEERING CIRCUIT BREAKER AND THEN WAS ABLE TO USE DIFFERENTIAL PWR AND BRAKING TO MAKE THE TURN. IN THE SHORT TIME PERIOD WE WERE STOPPED ON THE RWY, THE COPLT THOUGHT THAT WE COULD MAKE A R TURN, WHICH HE CONVEYED TO ATC. IN REALITY, WE COULD MAKE NO TURNS. ATC MADE THE ACFT IN POS AND HOLD BEHIND US TAXI CLR OF THE RWY. WE WERE CLR OF THE ACTIVE RWY BEFORE THERE WAS A CONFLICT WITH THE LNDG TFC. WE RESET THE ACFT NOSEWHEEL STEERING CIRCUIT BREAKER AND COULD NOT DUPLICATE THE PROB. IN CONSULTING WITH MAINT AFTER LNDG, IT WAS DETERMINED THE GLITCH WAS PROBABLY DUE TO THE LARGE AMOUNT OF RAIN WE HAD FLOWN THROUGH JUST PRIOR TO LNDG, CONTAMINATING A CANNON PLUG IN THE NOSEWHEEL WELL THAT CTLS THE NOSEWHEEL STEERING. BY THE WAY, WE WERE OPERATING UNDER FAR PART 91 TO ACHIEVE A PART 135 FLT, IE, PICKING UP FREIGHT AT MDW.

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.