SDR ASAA2018080625666

Service difficulty report · Fmc · Boeing 737890

Difficulty date: August 2, 2018
Submitted: August 6, 2018
Operation: Air carrier
Aircraft: N568AS
Make and model: Boeing 737890
Aircraft serial: 35183
Aircraft time: 44,067 hours, 13,395 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
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, VTK INDICATED ON CAPTAINS MFD, MAP FLAG APPEARED, WHILE LOOKING AT QRH PROCEDURES, BOTH FMC'S BLANKED FOR A MINUTE, THEN CAME BACK. MINUTES LATER VTK APPEARED AGAIN ON CAPTAIN'S MFD THEN DISAPPEARED AND SYSTEMS OPERATED NORMALLY. ACFT GROUNDED. UNABLE TO DUPLICATE MALFUNCTION ON LT AND RT FMC'S. NO HISTORY 30 DAYS. LT & RT FMCS OPS CHECKED GOOD IAW AMM 34-61, TASK 801.