Definitions containing the term unscheduled

What does unscheduled mean?

ZUD	Zero Unscheduled Downtime Academic & Science » Electronics
ZUD	Zero Unscheduled Downtime Business » General
ZUD	Zero Unscheduled Downtime Governmental » Military
ZUD	Zero Unscheduled Downtime Computing » Software
ZUD	Zero Unscheduled Downtime Computing » Telecom
ZUD	Zero Unscheduled Downtime Computing » Networking
ZUD	Zero Unscheduled Downtime Governmental » NASA
ZUD	Zero Unscheduled Downtime Computing » Hardware
ZUD	Zero Unscheduled Downtime Governmental » US Government
MMBUMA	Mean Miles Between Unscheduled Maintenance Actions Governmental » Military
U/M	Unscheduled Maintenance Governmental » NASA
MTBUR	Mean Time Between Unscheduled Removal Academic & Science » Electronics