SF 340B
Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Executed Go Around / Missed Approach
Procedure; Environment - Non Weather Related
During a visual approach to IAD Runway 19L we encountered wake turbulence about 100 FT AGL. This wake turbulence caused an uncommanded 25 degree left bank. We immediately executed a go-around and made our return via Approach vectors to conduct a visual approach to 19L. We landed and returned to the gate without further incident. Potomac Approach had vectored us to follow a B777 at 5 miles in trail. We were given a speed restriction of 210 KTS while the B777 was given a speed restriction of 180 KTS. Noticing we were overtaking the B777 I asked the First Officer to inquire about a speed reduction for us. Before he could ask ATC for the reduction we were cleared for the visual approach. I immediately configured the aircraft for final approach speed. This did not provide enough separation to avoid the wake turbulence.
An SF340B Captain reported encountering wake vortex from a preceding B777 on approach to IAD that resulted in an uncommanded 25 degree left bank. A go-around was executed.