SDR ASAA2019061329681

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: June 11, 2019
Submitted: June 13, 2019
Operation: Air carrier
Aircraft: N483AS
Make and model: Boeing 737990ER
Aircraft serial: 36350
Aircraft time: 15,206 hours, 4,972 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

DURING CRUISE, L FMC FAILED. VTK DISPLAYED ON L ND, AND FMC PROMPT DISAPPEARED FROM L CDU MENU. AFTER 20-30 SECONDS, ALL FLAGS DISAPPEARED AND NORMAL FMC OPS WERE RESTORED. NO DATA WAS LOST DURING THE FAILURE. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 34-61 TASK 801 FMC BITE PROCEDURE NO FAULTS FOUND.