HS25 flight crew encounter wake turbulence rolls when in-trail at FL250 under ZDC control.

Attributes
ACN	529874
Time
Date	200111
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : mgw.vortac
State Reference	WV
Altitude	msl single value : 25000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : corporate
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : atp pilot : instrument
Experience	flight time last 90 days : 75 flight time total : 5950 flight time type : 1100
ASRS Report	529874
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : wake turbulence other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : overrode automation flight crew : regained aircraft control flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Environmental Factor

Narrative:

During cruise portion of flight, level at FL250, the other pilot and I were talking. In less than 1 second, the airplane went into a 70 degree hard left bank. The autoplt kicked off and the PF recovered to level. 10 seconds or less passed then it went into a hard right bank, to probably 50 degrees bank. Our flight attendant was up serving drinks, she was knocked to the floor. I then noticed an aircraft roughly 10 mi in front of us on TCASII at our altitude. I told the controller about what had just happened. He responded as if it was no big deal! And that we were 12 mi in-trail of a B757. I requested a different altitude, but he started the B757 down. The passenger were visibly shaken but okay. The flight attendant was uninjured.

Original NASA ASRS Text

Title: HS25 FLC ENCOUNTER WAKE TURB ROLLS WHEN IN-TRAIL AT FL250 UNDER ZDC CTL.

Narrative: DURING CRUISE PORTION OF FLT, LEVEL AT FL250, THE OTHER PLT AND I WERE TALKING. IN LESS THAN 1 SECOND, THE AIRPLANE WENT INTO A 70 DEG HARD L BANK. THE AUTOPLT KICKED OFF AND THE PF RECOVERED TO LEVEL. 10 SECONDS OR LESS PASSED THEN IT WENT INTO A HARD R BANK, TO PROBABLY 50 DEGS BANK. OUR FLT ATTENDANT WAS UP SERVING DRINKS, SHE WAS KNOCKED TO THE FLOOR. I THEN NOTICED AN ACFT ROUGHLY 10 MI IN FRONT OF US ON TCASII AT OUR ALT. I TOLD THE CTLR ABOUT WHAT HAD JUST HAPPENED. HE RESPONDED AS IF IT WAS NO BIG DEAL! AND THAT WE WERE 12 MI IN-TRAIL OF A B757. I REQUESTED A DIFFERENT ALT, BUT HE STARTED THE B757 DOWN. THE PAX WERE VISIBLY SHAKEN BUT OKAY. THE FLT ATTENDANT WAS UNINJURED.

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.