What must be ensured about the flashlight that a crewmember has for each flight?

For a flashlight carried by a crewmember during a flight, it is crucial that it is in good working order. This requirement ensures that the flashlight can perform its intended function effectively during emergencies or low-visibility situations. A reliable source of light is essential for safety, enabling crewmembers to navigate and manage tasks if power goes out or other contingencies arise.

While color specifications or the requirement of a flashlight being new might seem relevant, the primary concern is functionality. Similarly, ensuring a flashlight is devoid of batteries would render it useless, contradicting the purpose of having it onboard for emergencies. Therefore, maintaining the flashlight in good working order is the essential factor that ensures crew safety and preparedness.