The captain’s ADI and F/O’s HSI showing #2 nav information. Most aircraft installations crisscross ILS information.Glideslope dots represent 0.7 degrees each. Localizer deviation dots usually represent 1¼ degrees each for off centerline.The course knob is usually set at runway heading by the flight crew or straight up when maintenance is using the tester, but if the course was placed right/left of centerline the indication would still be the same. ILS indication or specifically the localizer does not care about compass heading.Helpful Tips for ILS Indication and Testing
#Localizer frequency full
Full scale defections of either needle should be noted when the vaiable knob of the tester is used. Most testers allow for separate control of localizer and glideslope signals or both can be driven simultaneously. If the proper output is received, both the localizer and glideslope flags should pull out of view. Honeywell FMS's have a line select key labeled NAV/RAD for inputting frequency and radial.
#Localizer frequency manual
Manual tuning is possible from the FMS control head. Tuning of the navigation receivers is accomplished by the Flight Management System. Newer generation aircraft do not have a navigation control. If an aircraft is equipped with dual systems, placing both controls to 108.10 is helpful as a comparison of indications. Tuning the aircraft's navigation control to 108.10 will place the receiver in ILS mode. This is actually the localizer frequency, but a matched glideslope output is also transmitted. Most units use 108.10 MHz as a standard test frequency. The basic functionality of them is the same. Many different varieties of test units are used today. Testing the ILS system is accomplished with the VOR/ILS test box. The flight director computer or FCC uses ILS data along with other inputs such as air data and radio altitude for display on the ADI flight director as "computed" data. Additional outputs from the receivers are sent to the autopilot and flight director computers for "coupled" approaches.
The navigation receivers provides this information. Glideslope and localizer information displayed with the deviation indicators is referred to as "raw" data. The ILS or Instrument Landing System is a landing aid used to provide the correct lateral and vertical angles to the end of the runway.
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