Which hydraulic action can interrupt the E-PBIT test?

Activating any hydraulic pump can interrupt the E-PBIT (Electrical Built-In Test) process because the E-PBIT test relies on specific conditions, including the status of the hydraulic systems, to ensure proper functionality. When a hydraulic pump is activated, it can change the system's pressure and flow characteristics, which may trigger a failure or an abnormal response in the systems being tested, thus interrupting the test.

The purpose of the E-PBIT is to verify the integrity and performance of the electrical and control systems without interference from external factors, such as hydraulic system changes. Knowing that activating a hydraulic pump affects the hydraulic systems and can lead to unexpected variables during the test is crucial for maintaining the aircraft's operational integrity during maintenance checks.