Is a site controller present on the flight line during all operations as per regulation?

The correct understanding is that a site controller is not required to be present on the flight line during all operations. While the presence of a designated person is important for safety and operational guidance, it may not be necessary for that individual to be physically located on the flight line at all times.

In many operational scenarios, procedures and regulations allow for remote communication and monitoring, enabling the site controller to oversee activities while being stationed elsewhere, as long as proper protocols are in place. This flexibility can enhance operational efficiency and resource management without compromising safety.

The option indicating that the site controller is present on the flight line during all operations would imply a constant physical presence, which may not be feasible or necessary in all contexts. The other choices suggest limited involvement during maintenance or testing, but the key takeaway is that the regulatory framework permits the site controller to operate effectively without being tethered to the flight line continuously.