equipment failure

**Equipment failure** is the **unplanned loss of tool function that stops or degrades production until corrective action restores operation** - it is a primary availability loss and often a major cost driver in fab operations. **What Is Equipment failure?** - **Definition**: Breakdown event where hardware, controls, or utilities no longer meet required operating conditions. - **Failure Forms**: Hard stops, intermittent faults, degraded operation, or safety-triggered shutdowns. - **Operational Consequence**: Causes unscheduled downtime, dispatch disruption, and potential lot-at-risk exposure. - **Measurement Basis**: Tracked by failure count, downtime duration, MTBF, and recurrence patterns. **Why Equipment failure Matters** - **Availability Loss**: Unplanned failures directly remove productive tool time. - **Cost Burden**: Outages incur repair labor, spare consumption, lost throughput, and expedite penalties. - **Quality Risk**: Partial or unstable failures can introduce process variability before full stop occurs. - **Planning Disruption**: Frequent breakdowns destabilize dispatch and increase cycle-time variation. - **Improvement Priority**: Failure reduction is usually one of the highest-return reliability programs. **How It Is Used in Practice** - **Failure Taxonomy**: Classify modes by subsystem and consequence to support precise analysis. - **Prevention Programs**: Combine PM, CBM, and predictive analytics to reduce repeat failures. - **Post-Failure Learning**: Perform root-cause closure and verify recurrence elimination. Equipment failure is **a core reliability and productivity challenge in manufacturing** - reducing failure frequency and impact is essential to sustained high OEE performance.