How often should emergency equipment be checked in the aircraft?

Emergency equipment on an aircraft is critical for ensuring passenger safety and adherence to regulations. The correct answer emphasizes that this equipment should be checked before each flight and in accordance with airline policy. This systematic approach helps ensure that all emergency devices, such as life vests, oxygen masks, first aid kits, and fire extinguishers, are operational and ready for use at all times.

Conducting inspections before each flight means that any deficiencies can be identified and addressed promptly, minimizing the risk of malfunction in an actual emergency. Additionally, compliance with the airline's specific policies reinforces the importance of consistent checks, as these policies may outline procedures for various types of flights, equipment, and situations unique to that airline's operations.

Other options suggest a less frequent checking schedule, which may not adequately ensure that the equipment is always in working order. Regular and thorough checks are essential in aviation safety protocols, making the choice to inspect emergency equipment before each flight the most effective practice.