Pilots can operate the radio with a lesser grade certificate, called the “Restricted Radiotelephone Operator Permit (RR).” This license is for most aircraft, aeronautical ground stations, and marine radiotelephone stations on pleasure vessels. You do not need an operator license to use other rad...
1. Thus, (mass) of harmful acid clouds float everywhere (cause) violent chain reactions (break) out. 2. These clouds blocked out the pilots’ sight but also damaged the engine syste m. 3. (Cheer)up by this news, biologists, their turn, began to do some research ( remove)...