- Abstract Machine availability and quality performance can significantly constraint the operation of production systems. This work investigates the throughput and flow-time of a serial production line, considering partial availability and imperfect quality processing. The study develops analytical models of a production system based on Markov Chains and the Queuing Theory. The analytical model's results are verified using discrete event simulation. Preliminary results exhibit the most throughput-constrained station and the impact of the model's parameters on selected performance measurements.