DH8 crew had severe wake turbulence from B767 in front of them in bos class B.

Attributes
ACN	477334
Time
Date	200006
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos.airport
State Reference	MA
Altitude	msl bound lower : 3000 msl bound upper : 3200
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a90.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : a90.tracon
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27 other
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : multi engine
Experience	flight time last 90 days : 230 flight time total : 10000 flight time type : 5600
ASRS Report	477334
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe inflight encounter : wake turbulence other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 30000 vertical : 0
Supplementary
Problem Areas	Weather FAA Flight Crew Human Performance ATC Human Performance Airspace Structure
Primary Problem	Ambiguous

Narrative:

We were being vectored for ILS runway 27 boston. We were cleared the ILS approach, maintain 170 KTS until 5 DME. The controller put a B767 on the localizer in front of us (5 mi). He dropped him in from above us. We ran into his wake which violently rolled our dash. I clicked off the autoplt and pulled up (climbed to 3200 ft). The controller asked us our speed. We told him we slowed it back to get more space between us and the B767 and that we just got hammered with his wake. He seemed more concerned with the fact that we were going to back things up on final. We appear to have traded dangers. We traded lahso for wake turbulence. Runway 22L was unavailable that day.

Original NASA ASRS Text

Title: DH8 CREW HAD SEVERE WAKE TURB FROM B767 IN FRONT OF THEM IN BOS CLASS B.

Narrative: WE WERE BEING VECTORED FOR ILS RWY 27 BOSTON. WE WERE CLRED THE ILS APCH, MAINTAIN 170 KTS UNTIL 5 DME. THE CTLR PUT A B767 ON THE LOC IN FRONT OF US (5 MI). HE DROPPED HIM IN FROM ABOVE US. WE RAN INTO HIS WAKE WHICH VIOLENTLY ROLLED OUR DASH. I CLICKED OFF THE AUTOPLT AND PULLED UP (CLBED TO 3200 FT). THE CTLR ASKED US OUR SPD. WE TOLD HIM WE SLOWED IT BACK TO GET MORE SPACE BTWN US AND THE B767 AND THAT WE JUST GOT HAMMERED WITH HIS WAKE. HE SEEMED MORE CONCERNED WITH THE FACT THAT WE WERE GOING TO BACK THINGS UP ON FINAL. WE APPEAR TO HAVE TRADED DANGERS. WE TRADED LAHSO FOR WAKE TURB. RWY 22L WAS UNAVAILABLE THAT DAY.

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.