What is the primary function of survival kits provided on aircraft?

The primary function of survival kits provided on aircraft is to offer emergency supplies for post-landing scenarios. These kits are specifically designed to support the safety and survival of crew and passengers in the event of an emergency, particularly when an aircraft lands in an uninhabited or hostile environment. The contents of these kits typically include essential items such as food, water, signaling devices, first aid supplies, clothing, and tools, all of which are critical for survival until rescue can occur.

This function aligns closely with the overarching responsibility of ensuring that all individuals aboard the aircraft have the necessary resources if a situation arises where they cannot immediately access help or return to safety. The other options, while important in their own contexts, do not specifically pertain to the survival-focused intent of these kits. For example, maintaining aircraft functionality relates more to operational performance, while ensuring passenger comfort and storing manuals pertain to regular flight operations rather than emergency responses.