MD-11
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Human-Machine Interface
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft
At approximately 15;000 feet descending on arrival to 4000 feet the Gen 1 OFF; Gen 2 OFF; Gen 3 OFF level 1 alerts all came on for about 1 second.  After approximately 1 second the alerts extinguished and all buses and IDG's appeared to be operating normally.  Passing 8;000 feet the auto-throttles failed and indicated amber on flight display.  While on downwind at 4;000 feet the autopilots failed; received 'Unable RNP' message and lost both flight directors.  The airplane was flying normally and no bus failure indications were noted on the display.  We configured early [and] flew a visual approach. On final check airmen noticed that First Officer Map display indicated almost 2 miles east of our actual position.  Landing was uneventful except that HUD flare did not occur.  The airplane had a differed Aux inertial.  And on the previous leg the auto brakes had failed and they too were deferred.  I think something is not right with the inertial nav systems in the airplane.  When we landed I had Maintenance meet the airplane and they indicated to me that there were no faults in the system.  Something is badly wrong with this airplane.  I was fortunate that it was a very nice day with light winds otherwise this could have been a more problematic flight.
MD-11 Captain reported multiple electrical system anomalies; and is concerned that Maintenance apparently cannot determine the cause.