SDR 2003UALA00848

Service difficulty report · Adc · Boeing 737522

Difficulty date: November 11, 2003
Submitted: November 25, 2003
Operation: Air carrier
Aircraft: N913UA
Make and model: Boeing 737522
Aircraft serial: 25291
Aircraft time: 34,285 hours, 25,675 cycles
Engine: Ge CFM56*
System (JASC): 3417 · Air Data Computer
Part: Adc
Condition: Failed
Location: Cockpit
Stage of operation: CL
How discovered: O
Nature of condition: I
Precautionary procedure: A

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

What was found

RETURNED DUE TO F/O AIRSPEED INDICATOR FLAG, MACH INDICATOR, VMO INDICATOR FLAG. ATTEMPTS TO CLEAR THE FLAGS WERE UNSUCCESFUL. THE AIR DATA COMPUTER WAS REPLACED. SUBSEQUENT WRITE-UPS INDICATE THAT THE COMPUTER IS NOT THE SOURCE OF THIS INCIDENT.