SDR AALA202010289002

Service difficulty report · Adc · Boeing 737823

Difficulty date: October 27, 2020
Submitted: October 29, 2020
Operation: Air carrier
Aircraft: N979AN
Make and model: Boeing 737823
Aircraft serial: 29568
Aircraft time: 34,841 hours, 14,068 cycles
System (JASC): 3414 · Airspeed/Mach Indicator
Part: Adc
Condition: Inoperative
Location: Captain'S
Stage of operation: TO
How discovered: O
Nature of condition: J
Precautionary procedure: C

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AIRCRAFT WAS GROUNDED. ON TAKEOFF ROLL AT 80 KIAS ON CAPTAINS AIRSPEED INDICATOR, FIRST OFFICER WAS SHOWING 90. SHORTLY AFTER 80KT CALL OUT, GOT AIRSPEED DISAGREE, AND ATS KICKED OFF. ABORTED TAKEOFF. AT APPROXIMATELY 95 KTS ON CAPTAINS AIRSPEED INDICATOR, RTO ENGAGED. SUPPLEMENTAL INFORMATION: FOUND AIRSPEED DISAGREE MESSAGE 31-65060. PERFORMED FIM 31-62-00, AND AMM 34-21-04. PITOT SYSTEM FLUSHING. REMOVED AND REPLACED CAPTAINS AIR DATA MODULE, IAW 34-21-04.