Under Cat C, which action is explicitly listed as allowed?

• A. Don't carry out tasks
• B. Carry out tasks
• C. Sign off Base Maint CRS
• D. Sign off CRS of others

Answer: (C)

The key idea here is the certification authority for Category C personnel. In CASA, a Cat C certifying person has the authority to sign off a Release to Service (CRS) for base maintenance tasks. This means they can formally authorize the aircraft to return to service after base maintenance has been completed, confirming the work meets the required standards.

So, the action that is explicitly listed as allowed for Cat C is signing off the Base Maintenance CRS. This reflects their role in certifying that substantial maintenance tasks have been completed properly and the aircraft is airworthy to return to service.

The other options aren’t about this certification function: carrying out tasks is the physical work performed by technicians rather than a certification action, and signing off the CRS of others isn’t an explicit Cat C allowance in this context. Signing off the CRS for base maintenance is the explicit recognition of Cat C’s authority.