SDR ASAA2018060624931

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: June 2, 2018
Submitted: June 6, 2018
Operation: Air carrier
Aircraft: N442AS
Make and model: Boeing 737990ER
Aircraft serial: 43293
Aircraft time: 18,039 hours, 5,998 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
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

DURING CRUISE, AT FL360, EXPERIENCED A LEFT FMC FAILURE. RESOLVED ITSELF IN ABOUT A MINUTE. THEN A RIGHT FMC FAILURE. ACCOMPLISHED THE QRH AND RESTORED NORMAL OPS. ACFT GROUNDED. LT FMC LOGGED A GLITCHED TIMER FAULT. RT FMC LOGGED THE LT FMC FAULT LAST LEG. ACCOMPLISHED A LT FMC GROUND VERIFICATION TEST IAW AMM 34-61-00, TEST PASSED.