ISOLATE EXTENT OF FLOODING

Figure 1-28.—Alarm switchboard visual displays and audible alarms. coolant has entered the waveguide, it can flow through the various sections of the waveguide system. It can cross over to other waveguide systems through the common dry air lines that are connected to the waveguide. As you can see from the above description, if the coolant leak is severe or remains undetected for a long period of time, a leaking water load can completely fill the waveguide system with coolant. You have to follow a logical troubleshooting procedure. If the problem is a common one in a specific combat system equipment, there will probably be a technical bulletin issued that describes how to isolate the flood damage. The following is a condensed procedure for waveguide flooding. ISOLATE EXTENT OF FLOODING It is imperative that the amount of waveguide contamination be determined before the microwave system is drained of water. If the exact level of contamination is not determined, many microwave components may needlessly be removed and many manhours expended unnecessarily. You will have to secure the cooling system and close all valves to the affected areas of the radar. If the cooling system uses a pressurized expansion tank, you will have to bleed off the air pressure. If you can still see the coolant in the sight glass of the expansion tank, you can estimate the amount of coolant missing since the system was last filled. Use the estimated loss to determine the amount of contamination that may have occurred. The dry-air 1-25