What does the E-PBIT automatically detect?

The E-PBIT, or Enhanced Pre-Flight Built-In Test, is a system designed to automatically assess the health and performance of the aircraft's various systems prior to flight. It primarily focuses on detecting failures in the aircraft's control units. This diagnostic capability is crucial for ensuring that all systems critical for safe operation are functioning correctly before takeoff.

Detecting failures in control units allows for early identification of potential issues that could affect flight safety and performance. By employing this automated testing, maintenance personnel can receive prompt alerts about the status of critical systems, facilitate quicker troubleshooting, and ultimately enhance the reliability of the aircraft operations.

The other options, while related to the aircraft's operation, do not represent the primary function of the E-PBIT. It is not specifically designed to assess hydraulic pump performance, conduct flight control actuator tests, or measure pressure in hydraulic reservoirs directly. These functionalities may be part of other monitoring systems but are not the central focus of what the E-PBIT aims to accomplish.