MD-11
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 165; Flight Crew Total 14600; Flight Crew Type 4100
Training / Qualification; Situational Awareness
Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Became Reoriented
Human Factors
We departed RKSI weighing about 618;000 pounds on the EGOBA 1L departure. The departure controller instructed us to fly the SID as published with restrictions; which was going to make crossing SI742 at FL170 difficult. Therefore I left the slats extended trying to climb to altitude; and also to out climb the 747 that took off before us as we hit his wake. In the end; we still had to advise the controller; we are unable SI742 at FL170. About 14;000 the IRO asked if I was aware that the slats were still extended; to which I replied; yes.     Crossing about FL160; I called for slats retracted; thinking that I had enough speed protection (high and low) but I was very wrong as we got the stick shaker when retracting the slats. The stick shaker went on and off; I think 3 different times as I lowered the nose to gain airspeed. We only lost about 100-200 feet in the recovery. We continued with no further issues.     We debriefed this as a crew and we all remembered doing this scenario a number of years ago in the simulator. I thought wrong thinking that it was affected at a higher altitude of around 23;000. Also; the IRO said in the debrief; 'that is why I asked if you were aware the slats were still extended.' If that was truly why he asked; I feel that he should have been more assertive and stated it much differently; though I was pilot flying and take full responsibility. I can assure you that I will not make this mistake again as I have been humbled and embarrassed but have learned from my mistake! Also; knowing that we were heavy; we needed to advise ATC that we will be unable to make the FL170 earlier and probably should have advised PDC controller.
[Report narrative contained no additional information.]
MD-11 flight crew reported receiving a stick shaker when the Captain retracted the slats on departure from RKSI.