During contingency
3.1 Manage traffic
The CRM authorises access to affected OCA and TRA.
The CRM will determine the extent of traffic management required to protect against
traffic overload, frequency congestion and to provide breaks to avoid staff fatigue.
The National ATS Contingency Plan (ATS-CP-0001) provides guidance on formulating
a Contingency Traffic Management Plan.
The CRM will maintain an Aircraft Tracking Form (ATS-FORM-0062). The NCC can
populate a Collaborative Information Display (CID) with the affected aircraft as a cross
check on request.
my bolding
CRM = Contingency Response Manager.
1/. You'll note it says
affected OCA and TRA which implies that OCA wouldn't be designated as TRA.
2/. CRM will determine the extent of traffic managed required
to provide breaks to avoid staff fatigue. Which staff would these be? TIBA/TRA is enacted when there are no staff available.