What actions will interrupt the automatic E-PBIT test?

The automatic Electrical Power Build-Up Integrated Test (E-PBIT) is designed to assess the electrical and power integrity of the aircraft's systems. This test is sensitive to various operational conditions, and certain actions can interfere with its execution.

Running a hydraulic pump is one of the actions that will interrupt the E-PBIT. This is because activating a hydraulic pump requires a significant draw on the electrical system, which can disrupt the test's monitoring of power distribution and status. By doing so, it alters the electrical load and potentially affects the performance indicators that the E-PBIT is measuring.

While switching off the master battery and activating engine ignition are also interruptions to the E-PBIT, the choice indicates that running a hydraulic pump is the only action that explicitly causes this interruption, thus making the selection of a single answer plausible in the context of the test. However, in reality, multiple actions, including the ones mentioned, can disrupt the E-PBIT. Therefore, understanding the impact of active systems on test results is important for cockpit operation and safety.