Narrative:

Aircraft departed dca on 3 passenger flight to ixd (olathe, ks). ZDC vectored aircraft to join J134 and assigned altitude FL330. Center advised that we were in trail of a company a B777, also at FL330. Crew observed B777 at 12 O'clock position, well ahead. Subsequent ZDC transmission was interpreted by crew to expect climb to FL350 before climb clearance would be provided to B777. After a few mins, B777 was observed to be at 12 O'clock position, climbing. At this time, ZDC advised of crossing company B757, left to right, at FL350. That aircraft was also sighted on constant bearing/decreasing range. Up to this time, flight was in smooth air. However, fl winds were just 7-10 KTS from our 7-8 O'clock position. PIC suspected possible encounter with B777 wake turbulence was imminent, but turn upwind would place aircraft 2000 ft below converging B757 wake. Course was maintained until aircraft was approximately 1 mi B757, then, a shallow left turn commenced, moderate turbulence encountered, followed by uncommanded left roll to approximately 30 degree angle of bank. Encounter lasted approximately 5 seconds before level, smooth flight conditions regained. (Autoplt did not disconnect.) crew reported encounter to ZDC and maintained offset 2 NM south of airway until B777 course diverged over ZTL advised that we were 12 NM in-trail of B777.

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Original NASA ASRS Text

Title: A CPR HAWKER CAPT, FLYING AT FL330 ENCOUNTERED WAKE TURB FROM A B757 2000 FT ABOVE AND A B777 AHEAD AND CLBING.

Narrative: ACFT DEPARTED DCA ON 3 PAX FLT TO IXD (OLATHE, KS). ZDC VECTORED ACFT TO JOIN J134 AND ASSIGNED ALT FL330. CTR ADVISED THAT WE WERE IN TRAIL OF A COMPANY A B777, ALSO AT FL330. CREW OBSERVED B777 AT 12 O'CLOCK POS, WELL AHEAD. SUBSEQUENT ZDC XMISSION WAS INTERPRETED BY CREW TO EXPECT CLB TO FL350 BEFORE CLB CLRNC WOULD BE PROVIDED TO B777. AFTER A FEW MINS, B777 WAS OBSERVED TO BE AT 12 O'CLOCK POS, CLBING. AT THIS TIME, ZDC ADVISED OF XING COMPANY B757, L TO R, AT FL350. THAT ACFT WAS ALSO SIGHTED ON CONSTANT BEARING/DECREASING RANGE. UP TO THIS TIME, FLT WAS IN SMOOTH AIR. HOWEVER, FL WINDS WERE JUST 7-10 KTS FROM OUR 7-8 O'CLOCK POS. PIC SUSPECTED POSSIBLE ENCOUNTER WITH B777 WAKE TURB WAS IMMINENT, BUT TURN UPWIND WOULD PLACE ACFT 2000 FT BELOW CONVERGING B757 WAKE. COURSE WAS MAINTAINED UNTIL ACFT WAS APPROX 1 MI B757, THEN, A SHALLOW L TURN COMMENCED, MODERATE TURB ENCOUNTERED, FOLLOWED BY UNCOMMANDED L ROLL TO APPROX 30 DEG ANGLE OF BANK. ENCOUNTER LASTED APPROX 5 SECONDS BEFORE LEVEL, SMOOTH FLT CONDITIONS REGAINED. (AUTOPLT DID NOT DISCONNECT.) CREW RPTED ENCOUNTER TO ZDC AND MAINTAINED OFFSET 2 NM S OF AIRWAY UNTIL B777 COURSE DIVERGED OVER ZTL ADVISED THAT WE WERE 12 NM IN-TRAIL OF B777.

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.