Narrative:

Upon arrival at panc (from kmmu) at approximately XA30Z on mar/sun/02 (g-iv), experienced a nosewheel steering malfunction that precipitated the aircraft swerving on the runway, apparently striking a runway light and coming to a stop on the runway. Flight conditions: scattered clouds at 6000 ft, 10 mi visibility, winds 030 degrees at 6-10 KTS. Landing runway 6R. The aircraft fuel state was approximately 6000 pounds, with 3 passenger and 3 crew members. The aircraft vref speed was approximately 131 KTS with an approach speed of approximately 141 KTS. The PIC (left seat) flew the entire approach to touchdown and managed all the inputs of pertinent controls once on the ground. A visual approach to landing runway 6R was flown to touchdown. A soft, on-centerline, on-speed touchdown was accomplished with the main landing gear. The nosewheel was placed on the ground, on centerline, with no drift and no rudder input. Once the nosewheel was placed on the ground the PIC xferred control of the aircraft control yoke to the sic and went to the nosewheel steering tiller wheel. Concurrently the aircraft began an aggressive drift to the right side of the runway. The PIC attempted to counter this drift with: 1) rudder pedal nosewheel steering, 2) tiller wheel nosewheel steering, 3) brakes -- mostly left brake to counter the trend, and 4) thrust reversers. The aircraft drifted off to the right, apparently striking a runway light. The drift was reversed through the use of differential brakes. The aircraft was slowed significantly after this right drift, the nosewheel seemed to caster hard left (from an apparent over-control of the differential braking) and a slowing left drift incurred. After the aircraft drift was reversed, the sic had a chance to look down at the EICAS display panel and note (and report) that the aircraft had experienced a nosewheel steering failure. Although an attempt, through a judicious use of differential right braking, was made to correct this drift, the aircraft was slowing and did not respond to the correcting force. The aircraft was stopped on the runway, but pointing about 75-90 degrees left of centerline. The aircraft landing gear was checked and a walkaround was accomplished prior to cycling (3 times) the nosewheel steering switch. The steering engaged on the third try. The aircraft was taxied off the runway and in to the FBO. The damage to the aircraft seemed to be limited to a scrape on the right main landing gear fairing door (presumably from a runway light). Once the crew disembarked the aircraft, the panc tower was called by the PIC. The PIC was told that a report would have to be filed (due to damage to runway light(south)). The verbiage on the report/incident inquiry would be words to this effect, 'aircraft landed runway 6R, experienced nosewheel steering failure, swerved, hit runway light, stopped on runway without further incident.'

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Original NASA ASRS Text

Title: LOSS OF ACFT CTL OCCURS ON A GULFSTREAM IV WHEN THE NOSEWHEEL STEERING MALFUNCTIONS ON THE LNDG ROLLOUT ON RWY 6R AT ANC, AK.

Narrative: UPON ARR AT PANC (FROM KMMU) AT APPROX XA30Z ON MAR/SUN/02 (G-IV), EXPERIENCED A NOSEWHEEL STEERING MALFUNCTION THAT PRECIPITATED THE ACFT SWERVING ON THE RWY, APPARENTLY STRIKING A RWY LIGHT AND COMING TO A STOP ON THE RWY. FLT CONDITIONS: SCATTERED CLOUDS AT 6000 FT, 10 MI VISIBILITY, WINDS 030 DEGS AT 6-10 KTS. LNDG RWY 6R. THE ACFT FUEL STATE WAS APPROX 6000 LBS, WITH 3 PAX AND 3 CREW MEMBERS. THE ACFT VREF SPD WAS APPROX 131 KTS WITH AN APCH SPD OF APPROX 141 KTS. THE PIC (L SEAT) FLEW THE ENTIRE APCH TO TOUCHDOWN AND MANAGED ALL THE INPUTS OF PERTINENT CTLS ONCE ON THE GND. A VISUAL APCH TO LNDG RWY 6R WAS FLOWN TO TOUCHDOWN. A SOFT, ON-CTRLINE, ON-SPD TOUCHDOWN WAS ACCOMPLISHED WITH THE MAIN LNDG GEAR. THE NOSEWHEEL WAS PLACED ON THE GND, ON CTRLINE, WITH NO DRIFT AND NO RUDDER INPUT. ONCE THE NOSEWHEEL WAS PLACED ON THE GND THE PIC XFERRED CTL OF THE ACFT CTL YOKE TO THE SIC AND WENT TO THE NOSEWHEEL STEERING TILLER WHEEL. CONCURRENTLY THE ACFT BEGAN AN AGGRESSIVE DRIFT TO THE R SIDE OF THE RWY. THE PIC ATTEMPTED TO COUNTER THIS DRIFT WITH: 1) RUDDER PEDAL NOSEWHEEL STEERING, 2) TILLER WHEEL NOSEWHEEL STEERING, 3) BRAKES -- MOSTLY L BRAKE TO COUNTER THE TREND, AND 4) THRUST REVERSERS. THE ACFT DRIFTED OFF TO THE R, APPARENTLY STRIKING A RWY LIGHT. THE DRIFT WAS REVERSED THROUGH THE USE OF DIFFERENTIAL BRAKES. THE ACFT WAS SLOWED SIGNIFICANTLY AFTER THIS R DRIFT, THE NOSEWHEEL SEEMED TO CASTER HARD L (FROM AN APPARENT OVER-CTL OF THE DIFFERENTIAL BRAKING) AND A SLOWING L DRIFT INCURRED. AFTER THE ACFT DRIFT WAS REVERSED, THE SIC HAD A CHANCE TO LOOK DOWN AT THE EICAS DISPLAY PANEL AND NOTE (AND RPT) THAT THE ACFT HAD EXPERIENCED A NOSEWHEEL STEERING FAILURE. ALTHOUGH AN ATTEMPT, THROUGH A JUDICIOUS USE OF DIFFERENTIAL R BRAKING, WAS MADE TO CORRECT THIS DRIFT, THE ACFT WAS SLOWING AND DID NOT RESPOND TO THE CORRECTING FORCE. THE ACFT WAS STOPPED ON THE RWY, BUT POINTING ABOUT 75-90 DEGS L OF CTRLINE. THE ACFT LNDG GEAR WAS CHKED AND A WALKAROUND WAS ACCOMPLISHED PRIOR TO CYCLING (3 TIMES) THE NOSEWHEEL STEERING SWITCH. THE STEERING ENGAGED ON THE THIRD TRY. THE ACFT WAS TAXIED OFF THE RWY AND IN TO THE FBO. THE DAMAGE TO THE ACFT SEEMED TO BE LIMITED TO A SCRAPE ON THE R MAIN LNDG GEAR FAIRING DOOR (PRESUMABLY FROM A RWY LIGHT). ONCE THE CREW DISEMBARKED THE ACFT, THE PANC TWR WAS CALLED BY THE PIC. THE PIC WAS TOLD THAT A RPT WOULD HAVE TO BE FILED (DUE TO DAMAGE TO RWY LIGHT(S)). THE VERBIAGE ON THE RPT/INCIDENT INQUIRY WOULD BE WORDS TO THIS EFFECT, 'ACFT LANDED RWY 6R, EXPERIENCED NOSEWHEEL STEERING FAILURE, SWERVED, HIT RWY LIGHT, STOPPED ON RWY WITHOUT FURTHER INCIDENT.'

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.