During a 400 hour inspection on a BPU, where is a coolant heater run time found?

The coolant heater run time is typically found on the service adjustments screen of the Distributed Control System (DCS). This screen is designed to provide detailed information relevant to maintenance and service procedures, including runtime data for auxiliary components like coolant heaters.

In this context, the service adjustments screen generally consolidates important operational data used by technicians during inspections, allowing them to assess component performance and maintenance needs. By having access to the coolant heater run time on this screen, personnel can easily determine whether the heater has been operating within normal parameters and if any maintenance or adjustments are required during the 400-hour inspection.

The other options, while relevant to system operation and diagnostics, are less suited for finding specific runtime data related to maintenance tasks. The diagnostic screen primarily serves for troubleshooting and system fault analysis, the operating status screen showcases real-time operational metrics, and the fuel management screen specifically focuses on fuel consumption and related data, rather than detailed service runtime information.