CATHODE-RAY TUBES (CRT’S)

equipment, such as rubber gloves and shorting probes before using them. WARNING! NEVER WORK ALONE ON ENERGIZED EQUIPMENT. On ships with minimum manning, you may not have the option of using another ET as a safety observer. Make sure that whoever is going to observe you is CPR qualified. Brief your observer on what you will be doing. Physically show him or her where the cut-off switch is located. Have him or her stand by at a safe distance with a rope or wooden cane to pull you from the equipment, should you get hung up. Follow procedures outlined in ET Volume 1 for voltage checks. MAN-ALOFT As we mentioned earlier, when you work aloft on radar antennas, your man-aloft chit protects you from the RF radiation hazards. But, you also need to be protected from falling. Do the required PMS for safety harnesses every time you use the harness. And remember, even a good harness can’t save you unless you use it right. When you go up the mast attach your harness properly so you can’t free fall to the deck. Attach a line to any tools you carry up, so they are unable to fall freely. Set the cut-off switches for any antennas along your way. WARNING! NEVER WORK ALOFT SAFETY OBSERVER. WITHOUT A It’s your life; pick good safety observers. Your safety observers should be aware of what type of maintenance you’re going to do. They also need to know whom to contact if you run into technical problems. Safety Observers are responsible for the safety of those walking underneath you as well as for your safety. They should position themselves so you can communicate with them without having to come down. The safety observer will pass your information to everyone else. If something is falling, communicate quickly. CATHODE-RAY TUBES (CRT’S) Cathode-ray tubes are part of radar scopes. You will definitely have to work around them. You will probably, at one time or another, pack or unpack, install, repair, or dispose of one. There are some very real dangers associated with handling a CRT. Always take the precautions discussed in ET Volume 1 whenever you handle a CRT. Never think about electronics without thinking about safety. Learn from the safety information you get from the Ship’s Safety Bulletins, Navy mishap reports, and personal experience. Follow established procedures and all safety instructions. Live longer. We’ve discussed many aspects of radar in this volume. In ET Volume 7, Antennas and Wave Propagation, we will provide specific information about radar antennas, waveguides, and transmission lines. Then in ET Volume 8, System Concepts, we will discuss specifics on radar cooling systems. 4-4