What must be initiated and attached to the reparable item after it is delivered by supply?

The correct answer is AFTO Form 350. This form is critical in the Air Force for tracking maintenance history and documenting information associated with aircraft components, including reparable items. When a reparable item is delivered by supply, the AFTO Form 350 must be initiated and attached to ensure that all relevant details, such as condition, maintenance actions, and any modifications, are recorded. This helps in maintaining an accurate record of the item's service life and facilitates effective lifecycle management.

The other forms mentioned have different purposes. For example, DD Form 1348-1A is typically used for requisitioning and shipping items, documenting the transfer of property but not specifically for tracking repairs or maintenance history. The document control form serves general administrative functions and does not specifically relate to reparable item tracking. The repair checklist may be used during the repair process, but it does not serve as the official documentation required upon receipt of the reparable item. Thus, AFTO Form 350 is essential for documenting the reparable item's history right from its delivery.