SDR ASAA2018100126342

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: October 1, 2018
Submitted: October 3, 2018
Operation: Air carrier
Aircraft: N493AS
Make and model: Boeing 737990ER
Aircraft serial: 41727
Aircraft time: 9,724 hours, 3,289 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 MULTIPLE TIMES, DUAL FMC OPS RESTORED BUT LEFT FMC FAILURES CONTINUED MULTIPLE TIMES SO FMC SOURCE SELECT SWITCH BOTH ON RIGHT. GROUNDED - YES. REF FIM 34-61 TASK 837, NO CURRENT FAULTS PROGRAM FAULT IN FLT 1 HISTORY. RESET FMC C/B'S, OPS NORMAL.