SDR ASAA2020013082024

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: January 28, 2020
Submitted: January 31, 2020
Operation: Air carrier
Aircraft: N483AS
Make and model: Boeing 737990ER
Aircraft serial: 36350
Aircraft time: 17,912 hours, 5,752 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
Stage of operation: CR
How discovered: V
Nature of condition: J
Precautionary procedure: K

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

What was found

LEFT FMC FAILED MULTIPLE TIMES DURING CRUISE. FAILED 3 TIMES, NO LONGER THAN 2 MINUTES AND CAME BACK TO NORMAL OPERATION EACH TIME. GROUNDED - YES. ACCOMPLISHED FMC BITE IAW FIM 34-61 TASK 801. FOUND PGM FAULT LAST LEG. ACCOMPLISHED FIM 34-61 TASK 837. LT FMC OPS NORMAL.