When altering a Track Authority, which changes are not permitted?

• A. Extending the OK time
• B. Deleting a portion of the authority
• C. Adding information in Box 8 lower lines or recording a release of a portion of the limits to the RTC is not permitted.
• D. Replacing the authority with RTC

Answer: (C)

Track Authorities are binding documents, and any change must go through the proper control process so the limits and safety conditions stay accurate and traceable. The action described—adding information in Box 8 lower lines or recording a release of part of the limits to the RTC—is not allowed because Box 8 contains fixed, formally issued details that define the authority’s conditions. Altering those lines or partially releasing limits would bypass the approved amendment process and create a mismatch between what the authority states and what the field is actually allowed to do, introducing safety risk and confusion.

Other adjustments, like extending the OK time, deleting a portion of the authority, or replacing the authority with RTC, are governed by approved procedures and can be handled through the RTC's authority or by issuing a new or amended TA. The key point is that Box 8 and releases of limits are not to be altered ad hoc; changes must follow the established process.