SDR ASAA2017051020715

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: May 10, 2017
Submitted: May 15, 2017
Operation: Air carrier
Aircraft: N483AS
Make and model: Boeing 737990ER
Aircraft serial: 36350
Aircraft time: 6,782 hours, 2,310 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
Stage of operation: TX
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

LEFT FMC SHOWS VTK FLAG INTERMITTENTLY ON GROUND. ACFT GROUNDED. ACCOMPLISHED LEFT FLIGHT MANAGEMENT COMPUTER SYSTEM BITE PROCEDURE TASK 34-61 TASK 801. NO FAULTS LOGGED ABOUT FMC COMPUTER FAIL IN 10 LEGS. DUE TO INTERMITTENT FAULTS. PERFORMED RELOAD OF ALL SW. OPS CHECKED, OPS, MEDB, LDDB, NAV DATA BASE, PERFORMANCE FACTOR AND ADDB. PERFORMED LEFT FLIGHT MANAGEMENT COMPUTER SYSTEM. OPS TESTED IAW 34-61-00-710-801. SYS CHECKED NORMAL.