SDR ASAA2020110533512

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: November 5, 2020
Submitted: November 10, 2020
Operation: Air carrier
Aircraft: N419AS
Make and model: Boeing 737990ER
Aircraft serial: 41734
Aircraft time: 28,577 hours, 9,198 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Part number: 1762000101
Part serial: 008204
Condition: Intermittent
Location: E/E Compt
Part time: 25,607 hours, 8,264 cycles
Stage of operation: NR
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

RT FMC FAILURE, RAN QRH PROCEDURE, DID NOT RESTORE. GROUNDED-YES. RIGHT FMC CURRENTLY WORKING, INFLIGHT FAULTS CODE 300 SHOWS RAM, MICRO CODE, MICRO CTL FAULTS ON FLTS 3-6, REF B737-900 AMM 34-61-02. REMOVED/REPLACED RT FMC COMPUTER. SOFTWARE CROSS LOAD GOOD. OPERATIONS NORMAL, REF SAME AMM. GROUND VERIFICATION CHECK GOOD.