SDR ASAA2018052974822

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: May 27, 2018
Submitted: May 29, 2018
Operation: Air carrier
Aircraft: N474AS
Make and model: Boeing 737990ER
Aircraft serial: 40715
Aircraft time: 11,698 hours, 3,888 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
Stage of operation: DE
How discovered: 9
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 DESCENT, THE FIRST OFFICER`S FMC FAILED WITH VTK. ACFT GROUNDED. THE LEFT FMC LOGGED PRE POS LAT RATE R FMC, NO FAULTS LOGGED IN RIGHT FMC. NO FAULTS LOGGED IN L&R ADIRU'S. ACCOMPLISHED FIM 34-61 TASK 824, GROUND VERIFICATION TEST PASSED. NO HISTORY PAST 30 DAYS.