A PA28 pilot, landing at cys, encountered a windshear downdraft at 15 ft causing aircraft to suddenl...

Attributes
ACN	536380
Time
Date	200201
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cys.airport
State Reference	WY
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Weather Elements	Windshear
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 2.3 flight time total : 152.6 flight time type : 43.9
ASRS Report	536380
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	inflight encounter : weather inflight encounter other other anomaly
Independent Detector	other flight crewa
Resolutory Action	controller : issued advisory none taken : unable
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Weather ATC Human Performance
Primary Problem	Weather

Narrative:

Landing at cys with wind 10 degrees off runway 26. ATIS reported wind from 250 degrees at 20 KTS gusting to 27 KTS. Tower reported wind from 250 degrees at 16 KTS. There were other small aircraft in pattern. Approach to land went normally, with wind correction as expected for wind 10 degrees off runway until 10-15 ft above the runway. I very suddenly sank straight down and then to the right. My airspeed at the time was 75 mph indicated and power was idle. The airplane hit the runway and spun around to the right on the ground. Ground observers (after the fact) told me that the wind sock spun around at the time of the incident. Other ground observer reported wind was from 160 degrees. I had my hand on the throttle ready to do a go around. Everything happened so quickly that I never had a chance to push the throttle in before the plane was on the ground and facing the wrong way. I believe I was caught in a windshear and lost my lift while I was low and slow in a downdraft. To correct: more wind practice, more go around practice.

Original NASA ASRS Text

Title: A PA28 PLT, LNDG AT CYS, ENCOUNTERED A WINDSHEAR DOWNDRAFT AT 15 FT CAUSING ACFT TO SUDDENLY DROP, REVERSING DIRECTION AS IT CONTACTED THE RWY.

Narrative: LNDG AT CYS WITH WIND 10 DEGS OFF RWY 26. ATIS RPTED WIND FROM 250 DEGS AT 20 KTS GUSTING TO 27 KTS. TWR RPTED WIND FROM 250 DEGS AT 16 KTS. THERE WERE OTHER SMALL ACFT IN PATTERN. APCH TO LAND WENT NORMALLY, WITH WIND CORRECTION AS EXPECTED FOR WIND 10 DEGS OFF RWY UNTIL 10-15 FT ABOVE THE RWY. I VERY SUDDENLY SANK STRAIGHT DOWN AND THEN TO THE R. MY AIRSPD AT THE TIME WAS 75 MPH INDICATED AND PWR WAS IDLE. THE AIRPLANE HIT THE RWY AND SPUN AROUND TO THE R ON THE GND. GND OBSERVERS (AFTER THE FACT) TOLD ME THAT THE WIND SOCK SPUN AROUND AT THE TIME OF THE INCIDENT. OTHER GND OBSERVER RPTED WIND WAS FROM 160 DEGS. I HAD MY HAND ON THE THROTTLE READY TO DO A GAR. EVERYTHING HAPPENED SO QUICKLY THAT I NEVER HAD A CHANCE TO PUSH THE THROTTLE IN BEFORE THE PLANE WAS ON THE GND AND FACING THE WRONG WAY. I BELIEVE I WAS CAUGHT IN A WINDSHEAR AND LOST MY LIFT WHILE I WAS LOW AND SLOW IN A DOWNDRAFT. TO CORRECT: MORE WIND PRACTICE, MORE GAR PRACTICE.

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.

A PA28 pilot, landing at cys, encountered a windshear downdraft at 15 ft causing aircraft to suddenly drop, reversing direction as it contacted the runway.