Narrative:

While holding short of runway 4L/22R on taxiway west behind 1 other aircraft, a cessna(?) twin was taking off on runway 22R. After breaking ground directly in front of us, the aircraft violently rolled 90 degrees left bank and began a steep descending turn. The aircraft completed nearly a 180 degree turn and was on a direct vector towards our left mid section and was only just able to roll wings level and initiate a climb missing us by our best estimate to be less than 100 ft vertical and horizontal. I later called bos tower and was informed that 3 other aircraft also reported the incident (not the aircraft involved) and that the twin aircraft in question was operated by a female pilot on a VFR flight plan to marthas vineyard and that wake separation may have been the cause of the incident.

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Original NASA ASRS Text

Title: PLT OF A CESSNA TWIN CAUGHT IN WAKE TURB RIGHT AFTER TKOF ALMOST COLLIDED WITH RPTR'S B737 ACFT HOLDING SHORT BEHIND ANOTHER ACFT FOR TKOF.

Narrative: WHILE HOLDING SHORT OF RWY 4L/22R ON TXWY W BEHIND 1 OTHER ACFT, A CESSNA(?) TWIN WAS TAKING OFF ON RWY 22R. AFTER BREAKING GND DIRECTLY IN FRONT OF US, THE ACFT VIOLENTLY ROLLED 90 DEGS L BANK AND BEGAN A STEEP DSNDING TURN. THE ACFT COMPLETED NEARLY A 180 DEG TURN AND WAS ON A DIRECT VECTOR TOWARDS OUR L MID SECTION AND WAS ONLY JUST ABLE TO ROLL WINGS LEVEL AND INITIATE A CLB MISSING US BY OUR BEST ESTIMATE TO BE LESS THAN 100 FT VERT AND HORIZ. I LATER CALLED BOS TWR AND WAS INFORMED THAT 3 OTHER ACFT ALSO RPTED THE INCIDENT (NOT THE ACFT INVOLVED) AND THAT THE TWIN ACFT IN QUESTION WAS OPERATED BY A FEMALE PLT ON A VFR FLT PLAN TO MARTHAS VINEYARD AND THAT WAKE SEPARATION MAY HAVE BEEN THE CAUSE OF THE INCIDENT.

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.