PA28 encounters likely wake vortex turbulence from B737 landing on upwind parallel runway.

Attributes
ACN	773765
Time
Date	200802
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
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
Aircraft 2
Controlling Facilities	tower : zzz.tower
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	descent : approach landing : roll
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 6 flight time total : 220 flight time type : 220
ASRS Report	773765
Events
Anomaly	excursion : runway inflight encounter : wake turbulence other anomaly
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Problem Areas	Aircraft Environmental Factor Flight Crew Human Performance
Primary Problem	Environmental Factor

Narrative:

During final approach for landing. I noticed an unusual drift to the right of centerline but was able to correct. During touchdown a strong gust lifted the left wing causing the right wing to make contact with the ground. Even with full aileron deflection I was unable to avoid this event. When the nosewheel made contact it must have been turned to the left which slightly bent the nosewheel strut. This caused the aircraft to turn left and veer off the runway into the grass almost at a 180 degree direction from the original runway heading. Only traffic was a B737 landing on runway xxl and I planned to touch down slightly further down the runway than usual just between txwys delta and papa. A possible contributing factor could have been wake turbulence which may have drifted over to runway xxr from a B737 which landed just before me on runway xxl. The crosswind was from the southwest (24013 KTS) future action for me will be to go around when an unusual gust of this type is experienced on final approach.

Original NASA ASRS Text

Title: PA28 ENCOUNTERS LIKELY WAKE VORTEX TURB FROM B737 LNDG ON UPWIND PARALLEL RWY.

Narrative: DURING FINAL APCH FOR LNDG. I NOTICED AN UNUSUAL DRIFT TO THE R OF CTRLINE BUT WAS ABLE TO CORRECT. DURING TOUCHDOWN A STRONG GUST LIFTED THE L WING CAUSING THE R WING TO MAKE CONTACT WITH THE GND. EVEN WITH FULL AILERON DEFLECTION I WAS UNABLE TO AVOID THIS EVENT. WHEN THE NOSEWHEEL MADE CONTACT IT MUST HAVE BEEN TURNED TO THE L WHICH SLIGHTLY BENT THE NOSEWHEEL STRUT. THIS CAUSED THE ACFT TO TURN L AND VEER OFF THE RWY INTO THE GRASS ALMOST AT A 180 DEG DIRECTION FROM THE ORIGINAL RWY HDG. ONLY TFC WAS A B737 LNDG ON RWY XXL AND I PLANNED TO TOUCH DOWN SLIGHTLY FURTHER DOWN THE RWY THAN USUAL JUST BETWEEN TXWYS DELTA AND PAPA. A POSSIBLE CONTRIBUTING FACTOR COULD HAVE BEEN WAKE TURBULENCE WHICH MAY HAVE DRIFTED OVER TO RWY XXR FROM A B737 WHICH LANDED JUST BEFORE ME ON RWY XXL. THE CROSSWIND WAS FROM THE SW (24013 KTS) FUTURE ACTION FOR ME WILL BE TO GAR WHEN AN UNUSUAL GUST OF THIS TYPE IS EXPERIENCED ON FINAL APCH.

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.