They also monitor a 1-800 telephone for trouble reports. The ASOS has extensive self-test features and remote maintenance monitoring capabilities. ASOS ETs can dial into a remote ASOS, check its status, and perform various maintenance functions without disturbing operations. By using the remote capabilities of ASOS, the ET usually knows which field replaceable unit is malfunctioning before going to the site. ETs shall conduct PM during repair visits whenever appropriate.
ASOS sensors require minimal calibrations.
Area electronics supervisors, electronics technicians in charge, or regional maintenance specialists provide overall field quality control of maintenance. A regional ASOS specialist is staffed in each regional headquarters. The ASOS equipment shall be restored to full operation within the times shown in the table below at least 95 percent of the time. Priority 1 . These are safety-related failures.