SDR ASAA2015112813983

Service difficulty report · Fmc · Boeing 737890

Difficulty date: November 28, 2015
Submitted: December 1, 2015
Operation: Air carrier
Aircraft: N592AS
Make and model: Boeing 737890
Aircraft serial: 35190
Aircraft time: 30,379 hours, 9,383 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Failed
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

DURING CRUISE, BOTH MAP AND VTK FLAGS APPEARED ON LT INDICATOR, FOLLOWED QRH UNABLE TO RESTORE DUAL FMC. LT FMC FAILED. ACFT GROUNDED. RECYCLED MAIN ACFT ELECT BUSSES, NR 1 & NR 2 FMC'S, OPS CHECK GOOD, REF MM 34-61, TASK 801. MAP & VTK FLAGS ARE BIASED OUT OF VIEW.