Air carrier medium large transport on landing rollout, nosewheel had severe shimmy. Stopped on runway and had emergency equipment called out. Maintenance reinstalled the torsion link and cleared to taxi to gate, hold short of runway 22L. In the confusion with all the equipment around the aircraft, failed to hold short of runway 22L, stopped at runway 22R.

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Attributes
ACN	355830
Time
Date	199612
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	ground other : taxi landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 138 flight time total : 12500 flight time type : 7100
ASRS Report	355830
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

During landing roll aircraft began to shimmy wildly, brought aircraft to stop on runway and advised tower to alert emergency equipment. Appears torsion link-steering disengaged upon landing causing nosewheel to caster violently. Link was reinstalled and we advised tower we would like to taxi to see if we had positive control. After ascertaining we had positive control we advised tower we would like to taxi to gate. Tower cleared us to taxi and hold short of runway 22L. We acknowledged the transmission. However, in the confusion of taxiing and being surrounded by emergency equipment, we inadvertently crossed runway 22L and stopped short of runway 22R.

Original NASA ASRS Text

Title: ACR MLG ON LNDG ROLLOUT, NOSEWHEEL HAD SEVERE SHIMMY. STOPPED ON RWY AND HAD EMER EQUIP CALLED OUT. MAINT REINSTALLED THE TORSION LINK AND CLRED TO TAXI TO GATE, HOLD SHORT OF RWY 22L. IN THE CONFUSION WITH ALL THE EQUIP AROUND THE ACFT, FAILED TO HOLD SHORT OF RWY 22L, STOPPED AT RWY 22R.

Narrative: DURING LNDG ROLL ACFT BEGAN TO SHIMMY WILDLY, BROUGHT ACFT TO STOP ON RWY AND ADVISED TWR TO ALERT EMER EQUIP. APPEARS TORSION LINK-STEERING DISENGAGED UPON LNDG CAUSING NOSEWHEEL TO CASTER VIOLENTLY. LINK WAS REINSTALLED AND WE ADVISED TWR WE WOULD LIKE TO TAXI TO SEE IF WE HAD POSITIVE CTL. AFTER ASCERTAINING WE HAD POSITIVE CTL WE ADVISED TWR WE WOULD LIKE TO TAXI TO GATE. TWR CLRED US TO TAXI AND HOLD SHORT OF RWY 22L. WE ACKNOWLEDGED THE XMISSION. HOWEVER, IN THE CONFUSION OF TAXIING AND BEING SURROUNDED BY EMER EQUIP, WE INADVERTENTLY CROSSED RWY 22L AND STOPPED SHORT OF RWY 22R.

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.