SDR ASAA2016032816119

Service difficulty report · Fmc · Boeing 737890

Difficulty date: March 28, 2016
Submitted: March 30, 2016
Operation: Air carrier
Aircraft: N592AS
Make and model: Boeing 737890
Aircraft serial: 35190
Aircraft time: 31,749 hours, 9,747 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
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

ON LEVEL OFF AT CRUISE, RECEIVED A VTK FLAG AND THEN MAP FLAG. AUTOPILOT STAYED ENGAGED BUT LOST LNAV AND REVERTED TO CWS ROLL. GOT OUT QRH FOR LOSS OF FMC AND BEFORE ANY CHECKLIST RUN CORRECTED ITSELF. FLAGS WERE ON CAPTAIN'S NAV DISPLAY. ACFT GROUNDED. PERFORMED FMC BITE TEST IAW FIM 34-61, TASK 801, NO DEFECTS NOTED.