PIC of small transport has control problems on landing due to yaw damper failure.

Attributes
ACN	157596
Time
Date	199009
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
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	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 3500
ASRS Report	157596
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical inflight encounter other other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

WX was reported as turbulent with wind shear. Just prior to T/D the yaw damper system on both left and right sides failed. The aircraft yawed to the left just before the main gear touched down. After aircraft was completely on the runway, full control input and a great amount of nose wheel steering were required to maintain a linear runway path. Landing was smooth but a great deal of yaw occurred both in the air, before T/D and when aircraft was in deceleration phase while on the runway.

Original NASA ASRS Text

Title: PIC OF SMT HAS CTL PROBLEMS ON LNDG DUE TO YAW DAMPER FAILURE.

Narrative: WX WAS RPTED AS TURBULENT WITH WIND SHEAR. JUST PRIOR TO T/D THE YAW DAMPER SYS ON BOTH LEFT AND RIGHT SIDES FAILED. THE ACFT YAWED TO THE LEFT JUST BEFORE THE MAIN GEAR TOUCHED DOWN. AFTER ACFT WAS COMPLETELY ON THE RWY, FULL CTL INPUT AND A GREAT AMOUNT OF NOSE WHEEL STEERING WERE REQUIRED TO MAINTAIN A LINEAR RWY PATH. LNDG WAS SMOOTH BUT A GREAT DEAL OF YAW OCCURRED BOTH IN THE AIR, BEFORE T/D AND WHEN ACFT WAS IN DECELERATION PHASE WHILE ON THE RWY.

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.