An EMB145 flight crew on short final experienced uncommanded yaw and roll. A safe landing was made; ...

Attributes
ACN	795685
Time
Date	200807
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 50
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	795685
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
ASRS Report	795686
Events
Anomaly	aircraft equipment problem : less severe inflight encounter : weather
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Weather Aircraft
Primary Problem	Aircraft

Narrative:

During landing on runway xx in ZZZ (I was the PF) at about 50 ft AGL; the aircraft yawed uncommanded to the left followed immediately by a 15-20 degree roll to the left. I was able to correct the yaw and roll and landed slightly left of centerline. The flight controls did not 'fight' me when I corrected; therefore; there was no need to push the quick disconnect button. Also; the yaw damper was confirmed off at 200 ft AGL. The touchdown itself was smooth and uneventful. I was able to correct back to the centerline but when I tried to use the tiller to steer off the runway; it was inoperative. The nosewheel was in free caster. We were able to clear the runway; but needed to be towed to the gate. The winds at the time of landing were 200 degrees at 4 KTS and the tower confirmed that there were no gusts. There were no other aircraft in the vicinity nor did we land immediately after another aircraft. After being towed to the gate; I wrote up the in-flight anomaly as well as the steering system inoperative. I contacted maintenance; the chief pilot; the director of operations; and dispatch and filled out an irregularity report. Supplemental information from acn 795686: I don't understand why the aircraft yawed and banked to the left. It was probably due to winds.

Original NASA ASRS Text

Title: AN EMB145 FLT CREW ON SHORT FINAL EXPERIENCED UNCOMMANDED YAW AND ROLL. A SAFE LANDING WAS MADE; BUT THEY THEN FOUND NOSEWHEEL STEERING TO BE INOP; SO THEY WERE TOWED TO THE GATE.

Narrative: DURING LNDG ON RWY XX IN ZZZ (I WAS THE PF) AT ABOUT 50 FT AGL; THE ACFT YAWED UNCOMMANDED TO THE L FOLLOWED IMMEDIATELY BY A 15-20 DEG ROLL TO THE L. I WAS ABLE TO CORRECT THE YAW AND ROLL AND LANDED SLIGHTLY L OF CTRLINE. THE FLT CTLS DID NOT 'FIGHT' ME WHEN I CORRECTED; THEREFORE; THERE WAS NO NEED TO PUSH THE QUICK DISCONNECT BUTTON. ALSO; THE YAW DAMPER WAS CONFIRMED OFF AT 200 FT AGL. THE TOUCHDOWN ITSELF WAS SMOOTH AND UNEVENTFUL. I WAS ABLE TO CORRECT BACK TO THE CTRLINE BUT WHEN I TRIED TO USE THE TILLER TO STEER OFF THE RWY; IT WAS INOP. THE NOSEWHEEL WAS IN FREE CASTER. WE WERE ABLE TO CLR THE RWY; BUT NEEDED TO BE TOWED TO THE GATE. THE WINDS AT THE TIME OF LNDG WERE 200 DEGS AT 4 KTS AND THE TWR CONFIRMED THAT THERE WERE NO GUSTS. THERE WERE NO OTHER ACFT IN THE VICINITY NOR DID WE LAND IMMEDIATELY AFTER ANOTHER ACFT. AFTER BEING TOWED TO THE GATE; I WROTE UP THE INFLT ANOMALY AS WELL AS THE STEERING SYS INOP. I CONTACTED MAINT; THE CHIEF PLT; THE DIRECTOR OF OPS; AND DISPATCH AND FILLED OUT AN IRREGULARITY RPT. SUPPLEMENTAL INFO FROM ACN 795686: I DON'T UNDERSTAND WHY THE ACFT YAWED AND BANKED TO THE L. IT WAS PROBABLY DUE TO WINDS.

Data retrieved from NASA's ASRS site as of May 2009 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.

An EMB145 flight crew on short final experienced uncommanded yaw and roll. A safe landing was made; but they then found nosewheel steering to be inoperative; so they were towed to the gate.