SDR ASAA2016122119116

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: December 21, 2016
Submitted: December 27, 2016
Operation: Air carrier
Aircraft: N467AS
Make and model: Boeing 737990ER
Aircraft serial: 36362
Aircraft time: 10,184 hours, 3,343 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Stage of operation: CR
How discovered: O
Nature of condition: O
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, CAPTAIN'S FMC WENT BLANK 3 TIMES. CAME BACK ON ITS OWN FIRST 2 TIMES. 3RD FAILURE, LOST ALL NAVIGATION DATA, "AT LIM" APPEARED UPPER DU, RAN QRH FOR SINGLE FMC OPS. CAPT'S FMC DID COME BACK LATER. ACFT GROUNDED. ACCOMPLISHED FMC OPERATIONAL TEST IAW AMM 34-61-00 & FMC DOWNLOAD IAW AMM 34-61-00-810-802. OPS CHECKED GOOD.