What was found
(LOG 8803170) DURING FUNCTIONAL CHECK FLIGHT WHEN FLT CONTROL "A" AND "B" TURNED TO OFF SEVERE PITCH UP. UNCONTROLLABLE WITH CONTROL COLUMN. IF FLT CONTROL SWITCH NOT TURNED ON RAPIDLY IT WOULD RESULT IN A STALL. FCF FAILED" DID NOT COMPLETE. ADJUSTED & VERIFIED RIG OF THE TAB CONTROL PUSH RODS OF THE PCU ELEVATOR AND ELEVATOR FEEL & CENTERING UNIT I.A.W. B737 A.M.M. 27-31-00-820-805/820-802/820-803 & 820-804. PERFORMED SATISFACTORY OPERATIONAL CHECK OF THE ELEVATOR SYSTEM I.A.W. B737 A.M.M. 27-31-00.