SDR ASAA2016081617728

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: August 16, 2016
Submitted: August 18, 2016
Operation: Air carrier
Aircraft: N491AS
Make and model: Boeing 737990ER
Aircraft serial: 44109
Aircraft time: 2,838 hours, 955 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

LEFT FMC FAILED IN FLIGHT. VTK FLAG DISPLYED BUT NO MAP FAIL FLAG DISPLAYED. MAP DISPLAY FAILED AND BOTH MCDU'S FAILED/BLANKED. ACCOMPLISHED FMC FAIL CHECKLIST. CONTINUED WITH FMC" SWITCH IN BOTH ON R POSITION. CONTINUED WITH NORMAL OPS. ACFT GROUNDED. FFR SHOWS FMC-L PGM FAULT. PUT FMC CROSSFEED SWITCH TO NORMAL. LEFT FMS CURRENTLY NORMAL. OPS CHECKED LEFT & RIGHT FMCS GOOD IAW AMM 34-61-00.