What was found
AFTER TAKEOFF INFLIGHT ANYTIME PITCH TRIM IS ACTIVATED EITHER NOSE UP OR DOWN, AMBER "AP STAB TRIM INOP" & AMBER "PRIMARY STAB TRIM FAIL" & CYAN "AP FAIL A & B" CAS MESSAGES DISPLAYED. PERFORMED OPS CK OF THE PITCH TRIM SWITCHING FOR SEVERAL HOURS WITH ACFT. IN AIRMODE AND AT ALTITUDE (SK-10K FT. AND 150- 200 KTS. COULD NOT DUPLICATE FAULT. TRIED DIFFERENT SCENARIOS, BUT NO FAULTS NOTED. AVP SYSTEM OP.S CKD. GOOD DURING THIS TESTING IAW MM 27-40-00.