As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL BOTH SGU`S WENT BLANK AT APPROX 85 KNOTS, THEN REAPPEARED AT 105-110 KNOTS THEY WENT BLANK AGAIN EXCEPT FOR SYSTEM DATA NOT AVAILABLE CAUTION ON EACH DISPLAY, SGU'S HAD BEEN RESET ON PRE FLIGHT DUE TO SAME PROBLEM T/O AT 110KNOTS WITH NO ADDITIONAL PROBLEMS. REPLACED SDAC IAW A310 AMM CH 31-55-22-4. OPS CKS GOOD.