What is required before conducting a hot check?

Before conducting a hot check, authorization from the commanding officer is essential. This requirement ensures that proper protocols and safety measures have been evaluated and approved by a senior authority. A hot check involves testing systems or equipment under operational conditions, which can pose risks and require careful oversight. The commanding officer's authorization signifies that all necessary precautions have been taken and that the crew has been briefed on safety measures. This step is critical to maintain safety and compliance within the operational environment.

In contrast to this, other options revolve around crew consensus, previous checks, or safety equipment verification, which may not encompass the comprehensive oversight necessary for the potentially hazardous nature of a hot check. Ensuring that a commanding officer is involved brings an added level of decision-making and leadership to the procedure, which is vital in a professional and safety-critical context.