SDR ASAA2016110418571

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: November 4, 2016
Submitted: November 7, 2016
Operation: Air carrier
Aircraft: N457AS
Make and model: Boeing 737990ER
Aircraft serial: 36355
Aircraft time: 10,939 hours, 3,591 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Failed
Location: Nr 2
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

DURING CRUISE, CAPTAIN'S NAV DISPLAY SHOWED MAP FOLLOWED BY VTK. BOTH FMC'S BLANKED. FOLLOWED QRH, BOTH FMC'S ON RIGHT. LEFT FMC FAILED. ACFT GROUNDED. FMC LEFT IN FLIGHT FAULT OF "INTERMITTENT FMC L GLITCH TIMER", IAW FIM 34-61 TASK 801. PERFORMED B737-900 FIM 34-61 TASK 836 WITH NO FURTHER DEFECTS NOTED. ETOPS GROUND VERIFICATION TEST SUCCESSFUL.