An air carrier large transport had a difficult landing in unrpted windshear.

Attributes
ACN	245254
Time
Date	199306
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw tower : dfw tower : fai
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 1100
ASRS Report	245254
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9800 flight time type : 1000
ASRS Report	245336
Events
Anomaly	inflight encounter : weather inflight encounter other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other
Situations
Airport	other physical facility procedure or policy : unspecified

Narrative:

Encountered moderate to severe turbulence approximately 50 ft AGL during landing flare. Encountered no more than light chop on final approach. Aircraft was held left wing down, nose aligned with centerline for a left crosswind normal landing. Aircraft touched down on the left truck-skip then right truck then both trucks. Very difficult to keep aircraft aligned on runway heading during flare maneuver. Thunderstorms to north. Runways 17/18 were active runways -- inside porks intersection asked to do 360 while they turned airport around, first assigned to runway 31R, flew runway 35R. Supplemental information from acn 245336: the first officer made several large roll inputs in a successful effort to maintain wings near level and runway alignment. Slightly over 2 G's on one touchdown. The rollout was normal. There were no LLWAS alerts issued nor did our inertial system indicate any significant wind changes. The flight recorder has shown a very rapid shift of wind below 200 ft AGL to a maximum of 33 KTS at 70 degrees off of the runway, from the left: a maximum roll of over 9 degrees to the left and 4 degrees to the right and a maximum roll rate of 15 degrees per second.

Original NASA ASRS Text

Title: AN ACR LGT HAD A DIFFICULT LNDG IN UNRPTED WINDSHEAR.

Narrative: ENCOUNTERED MODERATE TO SEVERE TURB APPROX 50 FT AGL DURING LNDG FLARE. ENCOUNTERED NO MORE THAN LIGHT CHOP ON FINAL APCH. ACFT WAS HELD L WING DOWN, NOSE ALIGNED WITH CTRLINE FOR A L XWIND NORMAL LNDG. ACFT TOUCHED DOWN ON THE L TRUCK-SKIP THEN R TRUCK THEN BOTH TRUCKS. VERY DIFFICULT TO KEEP ACFT ALIGNED ON RWY HDG DURING FLARE MANEUVER. TSTMS TO N. RWYS 17/18 WERE ACTIVE RWYS -- INSIDE PORKS INTXN ASKED TO DO 360 WHILE THEY TURNED ARPT AROUND, FIRST ASSIGNED TO RWY 31R, FLEW RWY 35R. SUPPLEMENTAL INFO FROM ACN 245336: THE FO MADE SEVERAL LARGE ROLL INPUTS IN A SUCCESSFUL EFFORT TO MAINTAIN WINGS NEAR LEVEL AND RWY ALIGNMENT. SLIGHTLY OVER 2 G'S ON ONE TOUCHDOWN. THE ROLLOUT WAS NORMAL. THERE WERE NO LLWAS ALERTS ISSUED NOR DID OUR INERTIAL SYS INDICATE ANY SIGNIFICANT WIND CHANGES. THE FLT RECORDER HAS SHOWN A VERY RAPID SHIFT OF WIND BELOW 200 FT AGL TO A MAX OF 33 KTS AT 70 DEGS OFF OF THE RWY, FROM THE L: A MAX ROLL OF OVER 9 DEGS TO THE L AND 4 DEGS TO THE R AND A MAX ROLL RATE OF 15 DEGS PER SECOND.

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.