SDR ASAA2018010923126

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: January 9, 2018
Submitted: January 11, 2018
Operation: Air carrier
Aircraft: N529AS
Make and model: Boeing 737890
Aircraft serial: 35198
Aircraft time: 30,316 hours, 9,089 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Light
Condition: False Activation
Location: Vtk
Stage of operation: CR
How discovered: O
Nature of condition: N
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ENROUTE, RECEIVED A VTK MOMENTARLY ON THE COPILOTS DISPLAY. SELECTED AUTOPILOT A AND THE MESSAGE WENT AWAY, CANNOT ENGAGE VNAV UNTIL RAN PROCEDURE IN FLIGHT HANDBOOK (SOFTWARE EXCEPTION HANDLING LOGIC) SEEMS TO WORK OK NOW. ACFT GROUNDED. PERFORMED FMC OPERATIONAL TEST IAW AMM 34-61-00, SYSTEM OPS CHECKED GOOD, NO HISTORY FOR THE LAST 30 DAYS. NO DEFECTS NOTED.