3–44. When you are in port, who must give you permission to test operate  your   radar  system? 1. The  commanding  officer 2. The command duty officer 3. The supervisor in charge of operations 4. Both 2 and 3 above 3-45. Which  of  the  following  hazard conditions  is  most  critical  during a  refueling  operation? 1. HERO 2. HERP 3. HERF 3–46. Which  of  the  following  hazard conditions is most critical when a person  is  working  aloft? 1. HERO 2. HERP 3. HERF 3–47. Which  of  the  following  hazard conditions  is  most  critical  during an  ammunition  off–loading operation? 1. HERO 2. HERP 3. HERF 3–48. What  parameter(s)  is/are  used  to determine  safe  limits  associated with  electronic  equipment? 1. Power  density  of  the  radiation beam 2. Exposure time of the human body 3. Both 1 and 2 above 4. Potential of voltage to cause a burn injury 3–49. Which of the following requirements  pertain(s)  to  a safety  observer  for  a  technician working  on  energized  equipment? 1. Must be CPR qualified 2. Must know the location of all cut–off  switches 3. Must  have  a  nonconductive device to pull the technician from a circuit 4. All of the above 3–50. How often is the required PMS performed  on  a  safety  harness? 1. Each time it is used 2. Weekly 3. Monthly 4. Annually 16