Crj-700 flight crew experience wake turbulence on approach.

Attributes
ACN	675605
Time
Date	200510
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet 700 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 210 flight time total : 4700 flight time type : 700
ASRS Report	675605
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 155 flight time total : 4200 flight time type : 570
ASRS Report	675633
Events
Anomaly	inflight encounter : wake turbulence other anomaly other anomaly other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment flight crew : regained aircraft control
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

We were on a visual approach behind a B757 about 6 mi ahead. When we selected flaps 45 degrees; the aircraft began buffeting. The first officer (PF) got concerned about the aircraft; and how it was handling. The buffeting didn't feel to be wake turbulence; but we decided to go around. The first officer already had full power; so he called for flaps 8 degrees. The aircraft then sank and no acceleration was being made. The PF reported that the aircraft wasn't flying properly; and mentioned something about landing off field. I asked if he still wanted to land on the runway. He said 'yes' and called for flaps 45 degrees. Not knowing if it was a structural problem or not; I declared an emergency and told the flight attendants to have the passenger brace. The PF kept the airspeed at 180 KTS until short final. The landing and rollout were uneventful. No damage was observed to the aircraft.

Original NASA ASRS Text

Title: CRJ-700 FLT CREW EXPERIENCE WAKE TURB ON APCH.

Narrative: WE WERE ON A VISUAL APCH BEHIND A B757 ABOUT 6 MI AHEAD. WHEN WE SELECTED FLAPS 45 DEGS; THE ACFT BEGAN BUFFETING. THE FO (PF) GOT CONCERNED ABOUT THE ACFT; AND HOW IT WAS HANDLING. THE BUFFETING DIDN'T FEEL TO BE WAKE TURB; BUT WE DECIDED TO GO AROUND. THE FO ALREADY HAD FULL PWR; SO HE CALLED FOR FLAPS 8 DEGS. THE ACFT THEN SANK AND NO ACCELERATION WAS BEING MADE. THE PF RPTED THAT THE ACFT WASN'T FLYING PROPERLY; AND MENTIONED SOMETHING ABOUT LNDG OFF FIELD. I ASKED IF HE STILL WANTED TO LAND ON THE RWY. HE SAID 'YES' AND CALLED FOR FLAPS 45 DEGS. NOT KNOWING IF IT WAS A STRUCTURAL PROB OR NOT; I DECLARED AN EMER AND TOLD THE FLT ATTENDANTS TO HAVE THE PAX BRACE. THE PF KEPT THE AIRSPD AT 180 KTS UNTIL SHORT FINAL. THE LNDG AND ROLLOUT WERE UNEVENTFUL. NO DAMAGE WAS OBSERVED TO THE ACFT.

Data retrieved from NASA's ASRS site as of January 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.