When using a GPU or external power, the AVAIL light indicates what two things?

When using a GPU or external power, the AVAIL light indicates what two things?

• A. The power is connected physically and the power being delivered is between 26 to 30.5 V
• B. Power is connected but voltage is below 24 V
• C. Power is not connected but voltage is between 26 to 30.5 V
• D. The power is connected and voltage is exactly 28 V

Answer: (A)

The situation the AVAIL light represents is twofold: power is physically connected, and the voltage being delivered is within the acceptable range. When you have a GPU or external power connected, and the supply voltage sits between about 26 and 30.5 volts, the AVAIL indicator shows that power is ready to be used. This means the system recognizes a live power source and that the voltage is within spec to safely power the aircraft’s systems. If power is connected but the voltage is too low (below 24 V), the AVAIL light wouldn’t indicate readiness because the supply isn’t within the required operating range. If power isn’t connected at all, you also wouldn’t get availability, even if some stray voltage appeared somewhere else. The exact voltage isn’t what triggers availability; it’s being within the specified range, which can include many values, not just a single exact number like 28 V.

The situation the AVAIL light represents is twofold: power is physically connected, and the voltage being delivered is within the acceptable range. When you have a GPU or external power connected, and the supply voltage sits between about 26 and 30.5 volts, the AVAIL indicator shows that power is ready to be used. This means the system recognizes a live power source and that the voltage is within spec to safely power the aircraft’s systems.

If power is connected but the voltage is too low (below 24 V), the AVAIL light wouldn’t indicate readiness because the supply isn’t within the required operating range. If power isn’t connected at all, you also wouldn’t get availability, even if some stray voltage appeared somewhere else. The exact voltage isn’t what triggers availability; it’s being within the specified range, which can include many values, not just a single exact number like 28 V.