DC-10 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Deviation - Speed All Types; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
[We received a] momentary stall warning/activation due to encounter of B777 wake turbulence. ATC assigned us 210 KTS; and then descend to 6;000 FT at CLARK on the LTOWN arrival with a B777 ahead; around 6 mile range; and they were given same [clearance earlier]. Captain (pilot flying) using autopilot and descending on downwind; calm winds and aircraft began [to] roll right due to wake encounter approaching OLIVV Intersection. Autopilot unable to counter roll to return to level flight; approaching approximately 15 deg bank; speed of 210 gave us foot +15 in clean configuration. While PF disconnected autopilot to return to level the bank angle; had momentary stall warning/stick shaker activation. Normal roll to wings level and stall recovery normal; with a short auto slat extension during encounter. Extended slats for added protection as we were being vectored along same B777 approach. No further encounters. FOM-required logbook entry and crew performed post flight visual inspection with no defects noted.MEM Approach Controller should have notified us of B777 ahead; [and] applied greater separation distance on downwind arrival. Suggest that crews may need to consider use of 0/slat extended configuration while following B777 on initial arrival routes as aircraft is still relatively clean configuration and potential of greater wake production.
DC-10 Captain reported wake turbulence encounter in trail of a B777 on arrival to MEM and suggested additional spacing might be a good idea.