SDR ASAA2020111133544

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: November 11, 2020
Submitted: November 14, 2020
Operation: Air carrier
Aircraft: N487AS
Make and model: Boeing 737990ER
Aircraft serial: 44108
Aircraft time: 19,256 hours, 6,016 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Captain'S
Stage of operation: NR
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

VTK FLAG ON CAPTAIN`S NAV DISPLAY. NO FMC DATA ON BOTH CDU'S. LEFT FMC FAILED BEFORE WE COULD GO THROUGH QRH CHECKLIST, NAV DISPLAY AND CDU'S RETURNED TO NORMAL OPERATION. FURTHER FAILED, TEMPORARILY, MULTIPLE TIMES, RAN QRH CHECKLIST AND WENT TO SINGLE RT SIDE FMC OPERATION. GROUNDED-YES. PERFORMED LT FMC RESET, OPERATIONS NORMAL, REF B737-900 FIM 34-61 TASK 836. NO HISTORY 30 DAYS. GROUND VERIFICATION TEST SUCCESSFUL. SEAMC MIKE NOTIFIED.