Landing C310 ran off runway due to LLWS.

Attributes
ACN	569332
Time
Date	200212
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 100
Environment
Flight Conditions	VMC
Weather Elements	Windshear
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 135
Navigation In Use	other
Flight Phase	descent : approach landing : roll
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 1500 flight time type : 100
ASRS Report	569332
Events
Anomaly	excursion : runway inflight encounter : turbulence inflight encounter : weather inflight encounter other other anomaly other anomaly other
Independent Detector	other flight crewa
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

As I was approaching to land on runway 6, I encountered LLWS and drifted to the left of centerline and off the runway surface. The wind at the time was 150 degrees at 15 KTS gusts to 26 KTS. The preceding aircraft had reported +/-10 to +/-15 KIAS on final. There also was an airmet for LLWAS in the area. The approach to land was uneventful until the last 500-700 ft there were airspeed fluctuations of +/-10 to +/-20 KTS on short final. I was carrying additional power to fly through the approach. I was not in a position where I had to land and hold short. No one was behind me. I started to drift off center, and my rudder and aileron inputs were ineffective. I felt the aircraft 'bump,' and I believe it was at this time, I hit something. I corrected back and got back on the runway. I then taxied to the ramp and inspected the propellers at shutdown and noticed the damage to the tips. Causes: inability to correct for crosswind and gusty wind conditions. The intensity of the rough air increased as the day went on.

Original NASA ASRS Text

Title: LNDG C310 RAN OFF RWY DUE TO LLWS.

Narrative: AS I WAS APCHING TO LAND ON RWY 6, I ENCOUNTERED LLWS AND DRIFTED TO THE L OF CTRLINE AND OFF THE RWY SURFACE. THE WIND AT THE TIME WAS 150 DEGS AT 15 KTS GUSTS TO 26 KTS. THE PRECEDING ACFT HAD RPTED +/-10 TO +/-15 KIAS ON FINAL. THERE ALSO WAS AN AIRMET FOR LLWAS IN THE AREA. THE APCH TO LAND WAS UNEVENTFUL UNTIL THE LAST 500-700 FT THERE WERE AIRSPD FLUCTUATIONS OF +/-10 TO +/-20 KTS ON SHORT FINAL. I WAS CARRYING ADDITIONAL PWR TO FLY THROUGH THE APCH. I WAS NOT IN A POS WHERE I HAD TO LAND AND HOLD SHORT. NO ONE WAS BEHIND ME. I STARTED TO DRIFT OFF CTR, AND MY RUDDER AND AILERON INPUTS WERE INEFFECTIVE. I FELT THE ACFT 'BUMP,' AND I BELIEVE IT WAS AT THIS TIME, I HIT SOMETHING. I CORRECTED BACK AND GOT BACK ON THE RWY. I THEN TAXIED TO THE RAMP AND INSPECTED THE PROPS AT SHUTDOWN AND NOTICED THE DAMAGE TO THE TIPS. CAUSES: INABILITY TO CORRECT FOR XWIND AND GUSTY WIND CONDITIONS. THE INTENSITY OF THE ROUGH AIR INCREASED AS THE DAY WENT ON.

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.