SDR ASAA2016071017329

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: July 10, 2016
Submitted: July 12, 2016
Operation: Air carrier
Aircraft: N448AS
Make and model: Boeing 737990ER
Aircraft serial: 36356
Aircraft time: 1,069 hours, 349 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

ON LEVEL OFF THE CAPTAIN SIDE ND DISPLAYED VTK AND CAPTAIN SIDE MCDU SHOWED THE MENU PAGE WITH NO FMC OPTION. THE LEFT FMC RESTORED ITSELF WITHIN 1 MINUTE ON ITS OWN. LATER TRIED TO SELECT DIRECT , ERROR MESSAGE "INVALID MOD PLAN". SELECTED BOTH ON R FOR FMC'S, NORMAL OPS. AFTER 1 MINUTE SELECTED NORMAL, NORMAL OPS . ACFT GROUNDED. GROUND VERIFICATION COMPLETE. FMC BITE IAW FIM 34-61 TASK 801, TESTED GOOD.