SDR ASAA2014062308323

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: June 23, 2014
Submitted: June 25, 2014
Operation: Air carrier
Aircraft: N435AS
Make and model: Boeing 737990ER
Aircraft serial: 43292
Aircraft time: 2,533 hours, 825 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

SIMULTANEOUS DUAL FMC FAILURE DURING CRUISE, ROLL MODE WENT TO CWS WITH ALTITUDE HOLD DISPLAYED, RETURNED TO NORMAL AFTER APPROX 10-15 SECONDS, REENGAGED CNAV/VNAV. ACFT GROUNDED. HARDWARE FAULTS, SENSOR STATUS & IN FLIGHT FAULTS LEG 1 SHOWS NO FAULTS. SYS GROUND VERIFICATION CHECKED GOOD. ACCOMPLISHED FIM 34-61, TASK 801 & 837 TO RT FMC FOUND NO SOFTWARE OR HARWARE FAULTS. SENSOR STATUS & IN FLIGHT FAULTS LEG 1 SHOWS NO FAULTS. SYSTEM GROUND VERIFICATION CHECKED GOOD.