SDR ASAA2018041224248

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: April 12, 2018
Submitted: April 16, 2018
Operation: Air carrier
Aircraft: N453AS
Make and model: Boeing 737990ER
Aircraft serial: 36354
Aircraft time: 16,858 hours, 5,604 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Nr 1
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 FL340, THE LEFT FMC FAILED FOR ABOUT 1 OR 2 MINUTES. LEFT ND HAD VTK AND NO MAP. BOTH LEFT AND RIGHT MCDUS HAD NO FMC PROMPT. LEFT FMC RETURNED DURING START OF THE QRH PROCEDURE WITHOUT ANY ACTION TAKEN. ACFT GROUNDED. THE NR 1 FMC LOGGED ONE FAULT, RESET OPS OK.