When dealing with an electrical fire in the helicopter, what should NOT be done?

When facing an electrical fire in a helicopter, it is crucial to understand the proper response to effectively manage the emergency. Closing all cabin vents is not advisable during such an event. This action can potentially exacerbate the situation by trapping smoke and fumes inside the cabin, which presents a significant health hazard to the occupants and impairs visibility. Maintaining fresh air circulation can help mitigate smoke inhalation and may assist in keeping the situation more manageable.

In contrast, the other actions mentioned are standard procedures in response to an electrical fire. Landing as soon as it is safe to do so is critical to ensure the safety of all onboard and to bring the helicopter to a controlled stop. Turning off the battery and alternator is important to eliminate the source of the electrical fire, thereby preventing further electrical arcing or equipment failure. Shutting off the fuel supply could be necessary to prevent escalation of fire risk, especially if there is a possibility of ignition. Each of these actions directly contributes to enhancing safety and mitigating risks during an emergency event.