SDR ASAA2019060329555

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: May 31, 2019
Submitted: June 3, 2019
Operation: Air carrier
Aircraft: N435AS
Make and model: Boeing 737990ER
Aircraft serial: 43292
Aircraft time: 22,183 hours, 7,236 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Failed
Location: Left
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

LEFT FMC FAILED INTERMITTENTLY, FOUR OR FIVE TIMES DURING CRUISE. IT CORRECTED ITSELF WITHIN ONE MINUTE THE FIRST FEW TIMES,THEN PERSISTED. RAN QRH PROCEDURE, RESTORED NORMAL OPS. GROUNDED - YES. ACCOMPLISHED FMC BITE PROCEDURE WITH NO FAULTS NOTED REF B737-900 FIM 34-61 TASK 801. ALSO ACCOMPLISHED FIM 34-61 TASK 836 OPS CKS NORMAL.