What was found
CLIMBING THROUGH FL370, BOTH AUTOPILOT DISENGAGED, SEL ELEV FEEL MAN, SEL FLAP LIM OVRD, SEL FADEC ALT, OVERSPEED WARNING ON CAPT SIDE. AFTER GOING THROUGH " AIRSPEED UNRELIABLE" CHECK LIST DETERMINED AIR DATA COMPUTER 1 LIKELY BAD. SENSOR STATUS SHOWED ADC ! FAIL. OVERSPEED AURAL WARNING CONTINUED UNTIL DESCENDING THROUGH 370. SHGN 18MAR21 01:20 TPA U PURGED CAPTAIN PITOT LINE IAW MD-11 AMM 34-11-00-2 TASK 34-11-00-600-801, CAPTAIN PITOT LINE IS CLEAR. REMOVED AND REPLACED CADC #1 IAW MD11 MM 34-16-01-4. PERFORMED CADC #1 OPERATIONAL TEST IAW MD11 MM 34-16-01-5. ALL TEST PASSED. PERFORMED CADC/EIS INTERFACE TEST IAW MD11 MM 34-16-01-5. ALL TEST PASSED. PERFORMED FCC 1 AND FCC 2 AUTOLAND RTS TEST IAW MD11 MM 22-00-00-5. ALL RTS TEST PASSED. AIRCRAFT LLM CAT III IAW MD11 MM 22-00-00-2 AND GMM 6-5-495. AIRCRAFT APPROVED FOR RVSM OPERATIONS IAW MD11 MM 34-10-00-2 AND GMM 6-5-490. CADC 1 INSTALLED PART HONEYWELL P/N 4059060-901 S/N 91070370 OFF MPN: 4059060-901 POS: 1 SRL: 99020831 TAG NBR: 8H8353 ON MPN: 4059060-901 CPN: 3400394 SRL: 91070370 TAG NBR: 4770E7