SDR ASAA2017081121620

Service difficulty report · Fmc · Boeing 737890

Difficulty date: August 11, 2017
Submitted: August 14, 2017
Operation: Air carrier
Aircraft: N531AS
Make and model: Boeing 737890
Aircraft serial: 35199
Aircraft time: 27,900 hours, 8,299 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
Stage of operation: IN
How discovered: 9
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LEFT FMC IS INOPERATIVE, KEEPS RESETTING. ACFT GROUNDED. UNABLE TO DUPLICATE DEFECT. FMCS BITE IAW FIM 34-61, TASK 801 AND FIM 34-61, TASK 837 SHOWED NO FAULTS LOGGED BY EITHER FMC FOR LAST TEN LEGS. PERFORMED FMC SOFTWARE CONFIGURATION CHECK IAW AMM 34-61-00-750-801, AND FMCS OPERATIONAL TEST IAW AMM 34-61-00-710-801 - ALL TESTS PASSED.