SDR ASAA2016072417486

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: July 24, 2016
Submitted: July 27, 2016
Operation: Air carrier
Aircraft: N453AS
Make and model: Boeing 737990ER
Aircraft serial: 36354
Aircraft time: 10,257 hours, 3,324 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, LEFT FMC FAILED & RESOLVED ITSELF. LATER IT FAILED AGAIN & COMPLETED QRH, SELECTED BOTH ON. ACFT GROUNDED. PERFORMED LEFT FMC BITE CHECK IAW FIM 34-61 TASK 801. FOUND FAULT LEFT PGM FAULT. ACCOMPLISHED LEFT FMC HARDWARE/SOFTWARE FAULTS, FAULT ISOLATION IAW FIM 34-61 TASK 807. NO FAULTS FOUND, SYSTEM CHECKED NORMAL.