SDR ASAA2020013082023

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: January 28, 2020
Submitted: January 31, 2020
Operation: Air carrier
Aircraft: N492AS
Make and model: Boeing 737990ER
Aircraft serial: 44110
Aircraft time: 16,555 hours, 5,378 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Failed
Location: Right
Stage of operation: CR
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

DURING FLIGHT, THE RIGHT FMC FAILED AND DID NOT COME BACK, FLIPPED THE FMC SWITCH TO BOTH ON LT FOR REMAINDER OF FLIGHT. ACFT GROUNDED. PERFORMED IAW FIM 34-61 TASK 801 PRES POS LAT RATE FAULT, PERFORMED FIM 34-61 TASK 824 FAULT CLEARED. OPS CHECKED NORMAL.