SDR ASAA2016011414828

Service difficulty report · Warning Flag · Boeing 737990ER

Difficulty date: January 14, 2016
Submitted: January 20, 2016
Operation: Air carrier
Aircraft: N402AS
Make and model: Boeing 737990ER
Aircraft serial: 41189
Aircraft time: 12,721 hours, 4,114 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Flag
Condition: False Activation
Location: Fmc
Stage of operation: CR
How discovered: 9
Nature of condition: N
Precautionary procedure: O

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

What was found

IN CRUISE, AT FL 270, 2 FMC "VTK" FLAG WAS DISPLAYED, WITH "CWS" ON FMA ROLL MODE. SWITCHED TO CAPTAIN ON AUTOPILOT AND MASTER, THEN "VTK" F/O FLAG DISAPPEARED AND NR 2 FMC RETURNED TO NORMAL OPS. USED CAPT A/P AND FMC REMAINDER OF FLIGHT. ACFT GROUNDED. CREW STATED RT FMC RECOVERED NORMAL, OPS RT FMC, OPS NORMAL REF AMM 34-61-00-710-801. FMC TRANSFER SWITCH IN NORMAL POSITION.