SDR ASAA2014012612497

Service difficulty report · Warning Message · Boeing 737990ER

Difficulty date: January 26, 2014
Submitted: January 28, 2014
Operation: Air carrier
Aircraft: N453AS
Make and model: Boeing 737990ER
Aircraft serial: 36354
Aircraft time: 38 hours, 18 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Message
Condition: False Activation
Stage of operation: CR
How discovered: O
Nature of condition: G, 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, AUTOPILOT B ENGAGED, FMC P/RST YELLOW ALERT LIGHT ILLUMINATED. F/O MAP DISPLAY SHOWED VTX, FMA SHOWED CWS P, LNAV/VNAV DISENGAGED. AUTOPILOT REMAIN ENGAGED, AFTER SWITCHING TO AUTOPILOT A AND RESTORING LNAV & VNAV PROBLEM CLEARED ITSELF BEFORE QRH PROCEDURES. ACFT GROUNDED. COULD NOT DUPLICATE. ACCOMPLISHED FMCS OPS TEST IAW MM34-61-00, GROUND VERIFICATION TESTED NORMAL.