SDR ASAA2020103133454

Service difficulty report · Fmc · Boeing 737890

Difficulty date: October 31, 2020
Submitted: November 3, 2020
Operation: Air carrier
Aircraft: N577AS
Make and model: Boeing 737890
Aircraft serial: 35186
Aircraft time: 49,423 hours, 14,698 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Right
Stage of operation: AP
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

ON APPROACH, MOMENTARY FMC DISAGREE LIGHT ILLUMINATED V NAV WAS IN DISAGREEMENT INSIDE DIFFERENCE BETWEEN LEFT & RIGHT FMC WAS APPROXIMATELY 500'. CORRECTED ITSELF BY FAF. GROUNDED-YES. RESET BOTH FMC, REF B737-800 FIM 34-61 TASK 835. NO MESSAGE SHOW. INTERMITTENT FAULT, OK FOR SERVICE.