SDR ASAA2018091126089

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: September 9, 2018
Submitted: September 11, 2018
Operation: Air carrier
Aircraft: N479AS
Make and model: Boeing 737990ER
Aircraft serial: 60576
Aircraft time: 12,925 hours, 4,290 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Cockpit
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

LEFT FMC FAILED, RESTORED AS PER QRH 11.3. FAILED AGAIN 30 SECONDS LATER, CONFIGURED FOR SINGLE FMC (RIGHT) OPERATIONS, FMC BOTH ON RIGHT. GROUNDED - YES. PERFORMED FIM 34-61 TASK 807. NO CURRENT FAULTS, FLT 1 SHOWS PROGRAM FAULT. PULLED & RESET C/B'S PER FIM TASK, NO FURTHER FAULTS, OPS NORMAL.