The boat was powered by two 430 hp General Motors 12V71 diesel engines giving a top speed of 14.8 knots and it expelled its exhaust directly into the water reducing noise and smoke emissions, making it the quietest river patrol craft.

The boat carried some 650 gallons of diesel fuel, allowing an operational range of 130 nautical miles (240 km; 150 mi) at 10 knots.

Due to their steel construction and armor, the boats would also perform minesweeping in advance of river assault squadrons and serve as a blocking and interception force in the waterways around the area of operation.

A Navy investigation of all four sinkings concluded that the primary faults were the lack of seaworthiness caused by inadequate compartmentalization and marginal buoyancy, coupled with excessive weight and a low freeboard.

As a quick fix, Naval Forces Vietnam tried to improve the ASPB's seaworthiness by removing engine-compartment armor to reduce top weight.