AN MD-88 CAPTAIN NOTED DURING THEIR SECOND ATTEMPT ON TKOF ROLL THAT HIS AIRSPEED INDICATOR WAS SHOWING '0' KIAS WITH AN 'OFF' FLAG AND AN 'A/S' FLAG. FLIGHT CANCELED.

Narrative

PRIOR TO TKOF; ALL INSTS INDICATED PROPERLY. A FEW SECONDS AFTER INITIATING THE TKOF ROLL; THE FO CALLED 'CLAMP' AT 60 KTS. I GLANCED AT MY INSTS AND NOTICED MY AIRSPD INDICATOR WAS SHOWING 0 KIAS WITH AN 'OFF' FLAG AND AN 'AIRSPD' FLAG. I QUICKLY CHKED THE OTHER INSTS AND SAW NO OTHER ABNORMAL INDICATIONS. PRIOR TO 80 KIAS; I ELECTED TO DISCONTINUE TKOF. I RETARDED THE THROTTLES TO IDLE AND USED REVERSE THRUST. AUTOBRAKES AND AUTOSPOILERS WORKED NORMALLY. I TURNED OFF RWY AT TXWY D7. THE ACFT SLOWED IN A CALM MANNER. THE FO ALERTED TWR THAT WE WERE DISCONTINUING TKOF IMMEDIATELY UPON MY INITIATION OF THE PROC. WE REQUESTED NO ASSISTANCE FROM CFR. WE RETURNED TO THE GATE; WHERE MAINT REPAIRED THE JET. PAX REMAINED CALM AT ALL TIMES. AFTER REPLACEMENT OF THE #1 ADC; WE WERE REDISPATCHED. AGAIN; THE INSTS WERE NORMAL PRIOR TO TKOF. AT AN ESTIMATED 40 KTS MY AIRSPD INDICATOR AGAIN DISPLAYED AN 'OFF' FLAG AND 'AIRSPD' FLAG. I DISCONTINUED THE TKOF WITH NO FURTHER INCIDENT. WE RETURNED TO THE GATE FOR MAINT. AFTER THIS ATTEMPT; THE FLT WAS CANCELED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED AFTER INITIALLY DISCONTINUING THE TAKEOFF ROLL; MAINT DECIDED TO CHANGE THE AIR DATA COMPUTER. HOWEVER; THE SAME AIR SPEED INDICATOR AGAIN DISPLAYED AN 'OFF' FLAG AND AN 'A/S' FLAG DURING THE SECOND TAKEOFF ROLL. FLIGHT WAS CANCELED. REPORTER DOES NOT KNOW WHAT CORRECTIVE ACTION MAINT PERFORMED TO FIX THE DISCREPANCY.