Citationjet (C525/C526) - CJ I / II / III / IV
Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 40; Flight Crew Total 3490; Flight Crew Type 1120
ATC Issue All Types; Conflict Airborne Conflict; Inflight Event / Encounter Wake Vortex Encounter; Inflight Event / Encounter Weather / Turbulence
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
I was making a standard rate turn to 040 heading to capture the [Runway] 1C ILS. Every part of the flight was stable until the autopilot picked up the localizer. As the plane made the turn to 010; I had a green needle and the localizer was centering. At that time the plane hit severe turbulence; the autopilot kicked off; and the plane turned and pitched up. Within a few seconds; I had the plane stabilized. I turned back on course; and as I did; I got a TA to climb. I think the plane behind me had closed in (within five miles); which set the TA. ATC gave me a 270 heading and I broke off the approach; circled around; and made the second approach without any incident. I am not sure what caused the problem. It may have been wake turbulence: there was a warning about a B757 in front of me. The wind was 280 at 14-28 on the ground; it was 290 at 34-38 at 5;000 MSL. I do feel the Controller had us too close: he wanted me to hurry my turn to final. After looking at the flight path on flight aware; I did not get far off course. This happened in a matter of seconds; and as I turned back on the localizer; the TA came. At that time I felt the Controller made the correct decision to pull me off the approach. It was an IMC day and we were stacked up. When I got the plane stable; it was heading to the east; and I had gained 100 FT or so. I did react to the TA and climbed to 5;600 FT. I feel that if there had been more separation; I could have continued the approach without any problem.
A C525A in single-pilot operations encountered what was likely wake turbulence on approach to IAD behind a B757.