SDR ASAA2016041916470

Service difficulty report · Fmc · Boeing 737890

Difficulty date: April 19, 2016
Submitted: April 21, 2016
Operation: Air carrier
Aircraft: N583AS
Make and model: Boeing 737890
Aircraft serial: 35681
Aircraft time: 33,447 hours, 9,889 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
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

ON TAXI IN "VTK" DISPLAYED ON LEFT NAV DISPLAY, THEN CLEARED ITSELF. ACFT GROUNDED. CREW REPORTS THAT FAULT HAPPENED WHEN THEY SWITCHED POWER SOURCE FROM APU TO EXTERNAL POWER. BITE CHECK OF FMC'S REVEALS LEFT FMC FAULT ON GROUND LEG, PGM FAULT, REF FIM 34-61, TASK 801. SUSPECT FAULT LOGGED DUE TO POWER INTERRUPTION. FMCS SENSOR STATUS NORMAL, REF FIM 34-61, TASK 801 & 807.