SDR ASAA2018122637560

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: December 23, 2018
Submitted: December 27, 2018
Operation: Air carrier
Aircraft: N486AS
Make and model: Boeing 737990ER
Aircraft serial: 44107
Aircraft time: 13,182 hours, 4,378 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: First Officer'S
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

AT FL 340, 3.5 HRS INTO FLIGHT. F/O ND DISPLAYED VTK. LNAV AND VNAV DISENGAGED TO CWS R. AFTER APPROX 30 SEC NORMAL OPERATIONS RESUMED. NO FURTHER PROBLEMS. GROUNDED - YES. RESET F/O FMC IAW B737-900 FIM 34-61 TASK 836. GROUND VERIFICATION CHECK OK.