Service difficulty report · Fmc · Boeing 737990ER

Difficulty date
November 13, 2016
Submitted
November 15, 2016
Operation
Air carrier
Aircraft
N457AS
Make and model
Boeing 737990ER
Aircraft serial
36355
Aircraft time
11,027 hours, 3,626 cycles
Part
Fmc
Condition
Malfunctioned
Stage of operation
CL
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

DURING CLIMB APPROXIMATELY 10,000 FT BEGAN TO EXPERIENCE MULTIPLE AND RANDOM FMC ANOMALIES, VTK AND MAP WERE FIRST DISPLAYED ON CAPTAIN'S NAV DISPLAY, THEN ON F/O'S DISPLAY. BOTH CDU'S CYCLED REPEATEDLY BETWEEN THE MENU PAGE AND FMC PAGE. THIS SEEMED TO REPEAT SEVERAL TIMES AS IF BOTH FMC'S WERE RANDOMLY FAILING AND RESETTING. EVENTUALLY THE RIGHT FMC FAILED. QRH PROCEDURE FOR RIGHT FMC FAILURE WAS FOLLOWED AND NORMAL OPS WAS RESTORED. GROUNDED - YES. PERFORMED FMC TEST ON #2 PER B737-900 FIM 34-61 TASK 807. FAULT CLEARED. NO DEFECTS NOTED AT THIS TIME. A/C OK FOR SERVICE.