SDR ASAA2020103033457

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: October 30, 2020
Submitted: November 3, 2020
Operation: Air carrier
Aircraft: N402AS
Make and model: Boeing 737990ER
Aircraft serial: 41189
Aircraft time: 29,815 hours, 9,653 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 MULTIPLE TIMES. RAN CHECKLIST WHICH HAD US SWITCH FMC SOURCE TO RIGHT FMC. GROUNDED-YES. PERFORMED FMC RESET PROCEDURE, REF B737-900 FIM 34-61 TASK 836, INTERMITTENT FAULT. PERFORMED FMC BITE, REF FIM 34-61 TASK 801, NO FAULTS NOTED. OK FOR SERVICE. FMC SOURCE SELECTOR RETURNED TO NORMAL.