SDR ASAA2016113018895

Service difficulty report · Fmc · Boeing 737890

Difficulty date: November 30, 2016
Submitted: December 2, 2016
Operation: Air carrier
Aircraft: N586AS
Make and model: Boeing 737890
Aircraft serial: 35189
Aircraft time: 34,936 hours, 10,725 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
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

ACFT EXPERIENCED INTERMITTENT FMC FAILURES. INITIALLY FMC-L FAILED WITH VTK DISPLAYED ON ND CAPTAINS SIDE AND NO FMC PROMPT ON BOTH CDUS THEN FMC-R FAILED DISPLAYING VTK ON F/O ND. BOTH FMC'S RECOVERED + FAILED SEVERAL TIMES. FINALLY, BOTH FMC'S RECOVERED WITH NO PILOT ACTION + REMAINED FUNCTIONING FOR REST OF FLIGHT. GROUNDED - YES. REF B737-800 FIM 34-61 TASK 801 PERFORMED FMC BITE CHECK OF SYSTEM, CLEARED FAULTS, SYSTEM OPS NORMAL AND RESTORED, NO HISTORY PAST 30 DAYS.