MD11 Captain experiences severe turbulence and windshear during approach to RJAA with the First Officer flying. The Captain assumes flying duties when the aircraft does not climb as expected with maximum power. Missed approach altitude is exceeded due to up drafts.

Narrative

After established on final approach; fully configured; before landing checklist complete and cleared to land 16R at Narita; RJAA we experienced a severe windshear event. We were flying a monitored ILS; autopilot engaged; First Officer pilot flying; Captain pilot not flying. On about a 7 mile final we experienced severe; bordering on extreme turbulence; rain and possibly hail. The airplane drifted 2 dots left of course; the autopilot disconnected; the Tower reported an airport windshear alert and winds at 220/45. The IRU winds were showing 220/60 KTS. The First Officer engaged the other autopilot which immediately disconnected. I commanded 'go around and hand fly the airplane.' We executed the missed approach; flaps 28; gear up; confirmed missed approach altitude 6;000 FT. The airplane did not transition to the go around mode. I said 'make sure that you pushed the go around button.' The airplane was 10 degrees nose up; go around power and VSI 0. The airplane was not climbing so I said 'I have the airplane' then pitched the airplane up 20 degrees pushed the go around button and pushed PROF to re engage the auto throttles since they had disconnected. Approaching 6;000 FT I started leveling off but the airplane was experiencing severe updrafts and continued climbing to 6;500 FT with a level pitch attitude. I said 'advise ATC that we are unable to level at 6;000 FT due to severe updrafts.' At the same time ATC asked about our altitude and then said to maintain 7;000 FT. We had exceeded the 6;000 missed approach altitude due to experiencing severe windshear; severe turbulence and severe downdrafts followed by severe updrafts due to a severe thunderstorm on final approach.