SDR ASAA2022120541033

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: December 5, 2022
Submitted: December 7, 2022
Operation: Air carrier
Aircraft: N469AS
Make and model: Boeing 737990ER
Aircraft serial: 41702
Aircraft time: 31,300 hours, 9,955 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Faulted
Location: First Officer'S
Stage of operation: TX
How discovered: O
Nature of condition: P, 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 FO WAS INPUTTING DATA INTO RT FMC THE SCREEN WOULD GO BLANK THEN SHOW BITE PASS AND RETURN TO SCREEN. HAPPENED 5 TIMES, DID NOT LOOSE ANY DATA DURING THE BLANK SCREEN TIME. GROUNDED - YES. PERFORMED RESET AND BITE TEST OF FO'S FMC, IAW FIM 34-61, TASK 804. RESET CHECKED OK.