20 190-00356-31 Rev. CTo change the Barometric Pressure:1. From the Traffic Page, press the cursor tohighlight the Operating Mode field. Turn thelarge right knob to select the BarometricPressure Field. Use the small right knob toselect the desired value and press ENT. Note:When editing the value, use the large rightknob to select the digit to edit.2. Exit the field by pressing the CRSR button.When the TCAD 9900BX model is interfacedthere is an additional annunciation in the lower lefthand corner of the Traffic Page. This indicates whenthe TCAD unit is in approach mode (APR), or if theapproach is armed (APR ARM).Air ShieldPlease refer to the TCAD Pilot’s Handbook for adetailed description of the Air Shield.Traffic Warning WindowWhen the Traffic page is not displayed and atraffic threat becomes imminent, the Traffic WarningWindow will be displayed. The Warning Windowshows a small map and can display the Traffic Page (ifthe user presses ENT) or return to the previous page(if the user presses CLR).Ryan TCAD Traffic Warning WindowNOTE: The Traffic Warning Window is disabled whenthe aircraft ground speed is less than 30 knots or whenan approach is active.Threat AcquisitionPlease, see the TCAD Pilot’s Handbook.Audible and Visible AlertsVoice and tones are used to alert the pilot. The alertdescriptions used by TCAD are listed in the TCADPilot’s Handbook. Voice is used only during the high-est level of alerting; otherwise, tone is used. The voicealerting can be turned on or off either on the TCADSetup Page or on the configuration pages. See theGarmin 400W/500W Series Installation Manual avail-able at your authorized Garmin Service Center (onlyfor the 9900 model).Fault DisplaysIf the 400W/500W Series unit fails to detect theRyan TCAD or if it detects invalid data from theTCAD, the traffic screen will display the message, “NODATA”.LimitationsPlease see the TCAD Pilot’s Handbook for limita-tions of the TCAD system.Section 4Ryan TCAD Interface