SDR ASAA2019102173050

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: October 17, 2019
Submitted: October 22, 2019
Operation: Air carrier
Aircraft: N477AS
Make and model: Boeing 737990ER
Aircraft serial: 40716
Aircraft time: 17,642 hours, 5,585 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: First Officer'S
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

WHILE AT CRUISE FO'S ND HAD VTK FLAG WITH SINGLE FMC OPERATION IN SCRATCH PAD AND LOSS OF VNAV AND LNAV, AFTER ABOUT ONE MINUTE SYSTEM RESTORED ITSELF. GROUNDED - YES. PERFORMED FMC RESET PER B737-900 FIM 34-61 TASK 836. OPS CHECK NORMAL A/C OK FOR SERVICE.