The reporter's aircraft on visual approach failed to avoid wake turbulence encounter behind a boeing...

Attributes
ACN	275102
Time
Date	199405
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	agl bound lower : 100 agl bound upper : 100
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : iad tower : iad tracon : stl
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
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 : atp
Experience	flight time last 90 days : 218 flight time total : 2670 flight time type : 670
ASRS Report	275102
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other non adherence : far other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

On approach to dulles airport, approach called traffic you're to follow is on final, a B737. We called the traffic in sight and we were then cleared for the visual approach. Upon our frequency change to dulles tower we were told 'cleared to land behind a B757.' we then continued the approach a 'DOT' above GS. At 100 ft above the touchdown zone, a strong wingtip vortex was encountered rolling our bae-3201 90 degrees before control was regained. We were reported to have had a headwind of 5 KTS. The B757 apparently flew a high approach as well or touched down long, but because it was dark, we could not tell where the B757 landed. It would seem appropriate to provide adequate spacing behind this type of aircraft regardless of flight conditions to prevent possible unrecoverable sits like this. In addition, if we had TCASII we may have been able to see what the distance was and increased spacing.

Original NASA ASRS Text

Title: THE RPTR'S ACFT ON VISUAL APCH FAILED TO AVOID WAKE TURB ENCOUNTER BEHIND A BOEING 757.

Narrative: ON APCH TO DULLES ARPT, APCH CALLED TFC YOU'RE TO FOLLOW IS ON FINAL, A B737. WE CALLED THE TFC IN SIGHT AND WE WERE THEN CLRED FOR THE VISUAL APCH. UPON OUR FREQ CHANGE TO DULLES TWR WE WERE TOLD 'CLRED TO LAND BEHIND A B757.' WE THEN CONTINUED THE APCH A 'DOT' ABOVE GS. AT 100 FT ABOVE THE TOUCHDOWN ZONE, A STRONG WINGTIP VORTEX WAS ENCOUNTERED ROLLING OUR BAE-3201 90 DEGS BEFORE CTL WAS REGAINED. WE WERE RPTED TO HAVE HAD A HEADWIND OF 5 KTS. THE B757 APPARENTLY FLEW A HIGH APCH AS WELL OR TOUCHED DOWN LONG, BUT BECAUSE IT WAS DARK, WE COULD NOT TELL WHERE THE B757 LANDED. IT WOULD SEEM APPROPRIATE TO PROVIDE ADEQUATE SPACING BEHIND THIS TYPE OF ACFT REGARDLESS OF FLT CONDITIONS TO PREVENT POSSIBLE UNRECOVERABLE SITS LIKE THIS. IN ADDITION, IF WE HAD TCASII WE MAY HAVE BEEN ABLE TO SEE WHAT THE DISTANCE WAS AND INCREASED SPACING.

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.

The reporter's aircraft on visual approach failed to avoid wake turbulence encounter behind a boeing 757.