If the thermal radiation curtain is closed, what must be in place regarding the peephole cover?

When the thermal radiation curtain is closed, it is crucial for the peephole cover to be in place. This is necessary to ensure maximum insulation and protection from thermal radiation and to prevent any potential breaches of safety protocols. The peephole cover serves as an additional layer that mitigates the heat transfer, which is particularly important in environments where high temperatures may pose a risk to personnel or equipment.

By keeping the peephole cover in place, you help maintain the integrity of the thermal barrier provided by the curtain, preventing heat from entering or escaping through that opening. This consideration is vital in scenarios where thermal management is critical, such as during certain flight operations or in settings where safety is a paramount concern.