Off-track betting, or wagering at legalized betting outlets, usually in major cities. Wagering at these sites are usually commingled with on-track betting pools.
Operate To Break-Down. A maintenance strategy which operates equipment until break-down. A maintenance strategy which sometimes can be the most cost effective. Note: OTB is used when the consequence of failure is small enough that the benefit of preventing or finding failure early is more costly. OTB will be the fact for failures that occurs randomly and have no failure developing period.