PARTIAL INST FAILURE SHORTLY AFTER TKOF.

Narrative

AFTER TKOF FROM RWY 1 AT ALB; NY; AND DURING INITIAL CLBOUT BELOW 4000 FT; THE MASTER CAUTION LIGHT WENT ON. A FLT CTLS LIGHT ON THE CAP CAME ON. I IDENTED A STICK PUSHER FAULT AND CANCELED THE MASTER CAUTION. WE COMPLIED WITH ALL CHKLISTS AND PROCS; AND THEN CALLED ATC. AFTER NOTIFYING ATC WE RETURNED TO THE ARPT; THE LNDG WAS UNEVENTFUL. MAINT CHKED THE ACFT AND FOUND A BAD ANGLE OF ATTACK VANE. THEY REPLACED BOTH VANES AND A TEST FLT WAS ACCOMPLISHED. THE ACFT WAS RETURNED TO SVC. ACFT WAS AN ATR 42. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: MASTER CAUTION LIGHT IS INHIBITED DURING TKOF ROLL SO IT CAME ON IMMEDIATELY AFTER LIFTOFF. FLC ANALYZED AND IDENTED THE PROB AS A FAULTY STICK PUSHER. IT ACTIVATES WHEN THE ACFT IS FLOWN CLOSE TO STALL SPD. A MECHANICAL FORCE PUSHES THE YOKE FORWARD TO PREVENT A STALL FROM OCCURRING. THIS SYS WOULD ACTIVATE IF THE FLC WERE NOT OBSERVING THE AIRSPD APCHING STALL SPD. THIS FAULT OCCURRED BECAUSE ONE ANGLE OF ATTACK VANE DISAGREED WITH THE OTHER. ANGLE OF ATTACK WAS REPLACED AND THE ACFT TEST FLOWN AND THEN DEPARTED FOR ORIGINAL DEST.