How can the H-PBIT be initiated?

The Health and Power Built-In Test (H-PBIT) can be initiated through both manual and automatic means, which is why the correct choice is that it can occur in both ways.

When initiated manually, a crew member typically engages the system through specific controls in the cockpit, allowing for a controlled and intentional test of the aircraft systems. This capability is crucial during pre-flight checks, ensuring that any potential issues with the aircraft's systems are identified and addressed before takeoff.

Conversely, the H-PBIT can also be triggered automatically based on certain conditions or parameters that are met during flight. Automatic initiation allows the system to perform checks without requiring pilot intervention, ensuring that the aircraft remains in a safe operational state without needing constant oversight by the flight crew.

This dual capability enhances the reliability of the system by providing comprehensive coverage for testing, making sure that any malfunctions can be detected promptly, regardless of whether they occur during routine checks or in-flight scenarios.