What is NOT a function of the index-type TO?

The index-type Technical Order (TO) serves primarily to provide a systematic record of TOs in use, facilitate their management, and ensure that personnel can easily locate the necessary technical orders for aircraft armament systems.

Keeping historical records of usage is not a function of the index-type TO. Instead, its main functions revolve around cataloging TOs and assisting users in identifying current and relevant TO revisions. It does not track how individual TOs have been used historically; rather, it serves as an administrative tool to organize and reference current technical data.

The other functions listed are essential components of the index-type TO. It effectively shows the revision status of TOs to ensure personnel are using the most current and approved documents. Additionally, it aids in determining requisition requirements by helping users know which TOs they may need to order or reference. Furthermore, updating TO files and records is crucial for maintaining the accuracy and reliability of all technical documentation, ensuring that obsolete or superseded TOs are appropriately managed.