Which statement best describes the correct procedure for spike suppression when starting with external power?

Which statement best describes the correct procedure for spike suppression when starting with external power?

• A. The spike suppression switch is OFF
• B. The spike suppression is toggled after start
• C. The spike suppression switch is in START PROTECTION position prior to moving AVIONICS to DACS
• D. No requirement

Answer: (C)

When you apply external power, a surge can occur on the avionics power bus. The spike suppression feature is there to limit that transient and protect sensitive equipment during the power-up sequence. Engaging spike suppression in START PROTECTION before moving the avionics to the DACS path ensures a controlled, gradual energizing of the avionics system, reducing the risk of voltage spikes or inrush damaging boards or causing resets. If you leave spike suppression OFF, there’s no protection during the power transition. If you toggle it after starting or after the power connection, the transient could have already occurred, potentially stressing or damaging components. Saying there’s no requirement contradicts the safe procedure that’s designed to protect the avionics during this critical startup phase. So, placing the spike suppression switch in START PROTECTION prior to routing AVIONICS to DACS is the correct practice because it provides immediate protection during the critical power-up step.

When you apply external power, a surge can occur on the avionics power bus. The spike suppression feature is there to limit that transient and protect sensitive equipment during the power-up sequence. Engaging spike suppression in START PROTECTION before moving the avionics to the DACS path ensures a controlled, gradual energizing of the avionics system, reducing the risk of voltage spikes or inrush damaging boards or causing resets.

If you leave spike suppression OFF, there’s no protection during the power transition. If you toggle it after starting or after the power connection, the transient could have already occurred, potentially stressing or damaging components. Saying there’s no requirement contradicts the safe procedure that’s designed to protect the avionics during this critical startup phase.

So, placing the spike suppression switch in START PROTECTION prior to routing AVIONICS to DACS is the correct practice because it provides immediate protection during the critical power-up step.