What does the SHED BUSES Selector Knob OVRD position do?

What does the SHED BUSES Selector Knob OVRD position do?

• A. Closes the Shed Buses Contactors, provided the airplane is on the ground and at least one generator is operative
• B. Opens the Shed Buses Contactors
• C. Shuts down all generators
• D. Disconnects all batteries

Answer: (A)

When the SHED BUSES selector knob is in the OVRD position, it force-closes the shed bus contactors, but only if the airplane is on the ground and at least one generator is operating. This lets power from the generators flow to the shed buses for ground operations or testing, while preserving safe interlocks that prevent backfeeding or unintended energizing in flight. The mechanism relies on two safeguards: being on the ground and having a live generator, so the override doesn’t energize shed buses in flight or without a source of generation.

When the SHED BUSES selector knob is in the OVRD position, it force-closes the shed bus contactors, but only if the airplane is on the ground and at least one generator is operating. This lets power from the generators flow to the shed buses for ground operations or testing, while preserving safe interlocks that prevent backfeeding or unintended energizing in flight. The mechanism relies on two safeguards: being on the ground and having a live generator, so the override doesn’t energize shed buses in flight or without a source of generation.