SDR ASAA2016022115608

Service difficulty report · Warning Flag · Boeing 737990ER

Difficulty date: February 21, 2016
Submitted: February 23, 2016
Operation: Air carrier
Aircraft: N442AS
Make and model: Boeing 737990ER
Aircraft serial: 43293
Aircraft time: 8,879 hours, 2,873 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Flag
Condition: False Activation
Location: Fmc
Stage of operation: NR
How discovered: O
Nature of condition: N
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

F/O'S ND DISPLAY SHOWED TEMPORARILY VTK FLAG WITH LOSS OF LNAV/VNAV, THEN VTK FLAG WENT AWAY AND LNAV/VNAV RESTORED. ACFT GROUNDED. RIGHT FMC LOGGED "PRES POS LAT L, NO FAULTS ON LEFT FMC OR ADIRU'S. ACCOMPLISHED OPS TEST IAW AMM 34-61-00, SYS OPS CHECKS NORMAL.