What does pressing the EMER ELEC PWR MAN ON button accomplish?

What does pressing the EMER ELEC PWR MAN ON button accomplish?

• A. Deploy RAT and energize GCU
• B. Start the GPU
• C. Open bleed door
• D. Reset the electrical bus

Answer: (B)

This button activates the emergency electrical power management in manual mode. When pressed, the electrical system shifts to an emergency power path and prepares to use the emergency power source to feed essential buses. In practice, this means the system is set up to bring the available emergency power source (typically the Ground Power Unit if connected, or the RAT in certain fault states) online to keep the most critical systems powered. It does not by itself deploy the RAT or reset the entire electrical bus; those actions are controlled by the normal emergency logic or by separate sequences. Bleed door operation and status resets are unrelated to this control.

This button activates the emergency electrical power management in manual mode. When pressed, the electrical system shifts to an emergency power path and prepares to use the emergency power source to feed essential buses. In practice, this means the system is set up to bring the available emergency power source (typically the Ground Power Unit if connected, or the RAT in certain fault states) online to keep the most critical systems powered. It does not by itself deploy the RAT or reset the entire electrical bus; those actions are controlled by the normal emergency logic or by separate sequences. Bleed door operation and status resets are unrelated to this control.