SDR UIEA2020072301600

Service difficulty report · Adc · Boeing 76731K

Difficulty date: July 20, 2020
Submitted: July 23, 2020
Operation: Air carrier
Aircraft: N1489A
Make and model: Boeing 76731K
Aircraft serial: 27206
Aircraft time: 107,632 hours, 21,305 cycles
System (JASC): 3417 · Air Data Computer
Part: Adc
Part number: 4040800916
Part serial: 1196061
Condition: Malfunctioned
Location: Lt & Rt
Stage of operation: CR
How discovered: O
Nature of condition: G, J
Precautionary procedure: A

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

What was found

AIRSPEED DISAGREE, ALTITUDE DISAGREE, AILERON LOCK OUT, RUDDER RATIO EICAS MESSAGE. REMOVED AND REPLACED THE AIR DATA COMPUTER, LEFT AND RIGHT SIDE IAW AMM 34-12-01. OPS CHECKED GOOD. PERFORMED A TEST OF PITOT STATIC SYS IAW AMM 34-11-00, SYSTEM FOUND TO BE WITHIN LIMITS.

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