In an aircraft DC system, what is meant by 'load shedding,' and why is it used?

In an aircraft DC system, what is meant by 'load shedding,' and why is it used?

• A. Load shedding is temporarily disconnecting nonessential electrical loads to keep essential systems powered when source capacity is limited or during startup to prevent voltage drop
• B. Load shedding disconnects all loads to completely shut down the system
• C. Load shedding powers nonessential loads first
• D. Load shedding increases voltage by load redistribution

Answer: (A)

Load shedding in an aircraft DC system means temporarily disconnecting nonessential electrical loads to keep essential systems powered when the available source (generator or battery) isn’t able to meet all demand, such as during startup or when capacity is limited. By reducing demand, the system avoids voltage drops that could affect critical instruments and avionics, preserves essential bus voltage, and prevents overload or tripping of the power source. The shedding is temporary and reversible—once capacity stabilizes, nonessential loads can be reconnected. This isn’t about shutting everything down, prioritizing nonessential loads, or trying to boost voltage—it's about keeping the important systems powered by reducing the load during tight conditions.

Load shedding in an aircraft DC system means temporarily disconnecting nonessential electrical loads to keep essential systems powered when the available source (generator or battery) isn’t able to meet all demand, such as during startup or when capacity is limited. By reducing demand, the system avoids voltage drops that could affect critical instruments and avionics, preserves essential bus voltage, and prevents overload or tripping of the power source. The shedding is temporary and reversible—once capacity stabilizes, nonessential loads can be reconnected. This isn’t about shutting everything down, prioritizing nonessential loads, or trying to boost voltage—it's about keeping the important systems powered by reducing the load during tight conditions.