When checking the torch, what is one of the PDI requirements?

One of the PDI requirements for checking the torch is that the red light should flash at no more than 10 seconds. This requirement ensures that the torch is functioning properly and is capable of signaling in emergencies. A flashing red light at a consistent interval allows for effective signaling, enhancing visibility and communication in low-light or emergency situations. This function is particularly crucial for the safety of passengers and crew, ensuring that the torch can be used effectively if needed.

The other options, while related to the overall functionality of a torch, do not highlight this specific requirement within PDI checks. For instance, continuous illumination or the presence of a backup battery can enhance usability, but they do not address the crucial signaling capability required in emergency protocols. Additionally, while the torch may need protection, the requirement to be stowed in a special container does not specifically relate to its operational readiness in the same way that the flashing light does.