SDR ASAA2016021015388

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: February 10, 2016
Submitted: February 13, 2016
Operation: Air carrier
Aircraft: N579AS
Make and model: Boeing 737890
Aircraft serial: 35187
Aircraft time: 34,329 hours, 10,256 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Message
Condition: False Activation
Location: Fmc
Stage of operation: AP
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

WHILE HOLDING OVER FUNTER PLANNING AN RNP APPROACH, AN "FMS DIAGREE" LIGHT ILLUMINATED ON BOTH CAPT AND FO NAV DISPLAYS. COMPLETED QRH PROCEDURE AND CONDUCTED A CONVENTIONAL APPROACH. ALL GPS, NAV INPUT SHOWED NORMAL, ANP ALWAYS BETWEEN 0.02 AN 0.05. AFTER ABOUT 7 MINUTES LIGHT EXTINGUISHED. ACFT GROUNDED. REF FIM 34-61, TASK 835, REBOOT BOTH FMC SYS. BITE CHECK GOOD.