How do you verify that external power is connected and delivering correct power on the ERJ-145?

How do you verify that external power is connected and delivering correct power on the ERJ-145?

• A. Check external power indicator on the electrical synoptic page; verify voltage and frequency readings.
• B. Reliably check the aircraft's battery voltage alone.
• C. Inspect the APU electrical output indicators.
• D. Listen for power hum from the systems.

Answer: (A)

Verification of external power relies on reading live electrical parameters rather than indirect signs. On the ERJ-145, you confirm external power by using the electrical synoptic page: look for the external power indicator and check the voltage and frequency readings. When external power is connected and delivering correctly, the indicator shows active power and the voltage and frequency fall within their expected values (typically around 115 V AC at 400 Hz). This direct readout confirms both that the external source is connected and that it’s supplying proper power to the aircraft buses. Merely checking battery voltage doesn’t prove external power is in use, and inspecting APU outputs or listening for a hum doesn’t reliably verify external power status.

Verification of external power relies on reading live electrical parameters rather than indirect signs. On the ERJ-145, you confirm external power by using the electrical synoptic page: look for the external power indicator and check the voltage and frequency readings. When external power is connected and delivering correctly, the indicator shows active power and the voltage and frequency fall within their expected values (typically around 115 V AC at 400 Hz). This direct readout confirms both that the external source is connected and that it’s supplying proper power to the aircraft buses. Merely checking battery voltage doesn’t prove external power is in use, and inspecting APU outputs or listening for a hum doesn’t reliably verify external power status.