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 (e) EHSI VOR Mode Displays 1) The VOR modes display heading-up orientation from desired flight path. They also display heading data, track data, and flight data text. The EXP-VOR mode displays about 70° of arc and WXR when selected. The FULL-VOR mode displays a full 360° of arc and no WXR data. 2) The EHSI displays VOR course information in either a full compass rose or an expanded scale display when the EFIS mode select switch is in the FULL-VOR/ILS or EXP-VOR/ILS mode with the VOR/ILS navigation system tuned to a VOR frequency. 3) The course heading select line and pointer indicate the course selected on the DFCS control panel. The lateral deviation pointer and scale display the deviation from the selected course. When the airplane is on course, the lateral deviation pointer and heading select line will be lined up. 4) The TO-FROM pointer indicates the direction of the tuned VOR station. 5) The EHSI also displays VOR ground station and VOR radial positions in the MAP and PLAN modes (AMM 34-22-00). 6) VOR failure indications are displayed on the EHSI. The resulting displays for no-computed data (NCD) and invalid data are as follows: a) NCD causes the deviation bar to be removed. b) Invalid data causes the scale and bar to be removed and a yellow VOR fault flag to appear.
 c)  NCD or invalid data for the selected course causes the course pointer and line to be removed. Also, the lateral deviation bar is removed.
 (f) EHSI ILS Mode Displays 1) The ILS mode displays are similar to the VOR modes. They display track-up ILS deviations, heading information, track information and flight parameters in text. The differences between the FULL- and EXP-ILS modes are the same as for the VOR modes. 2) The localizer and glide slope deviation pointers and scale display deviation from the respective beam. They indicate the direction that the airplane must go in order to reduce the deviation to zero. 3) The EHSI also shows the runway (course) direction and the ILS tuned frequency selected on the VHF NAV control panel.
 4)  Absent or improper ILS signals and/or tuning data input to the receiver are defined as a no-computed-data (NCD) condition. For NCD in the receiver G/S channel, the G/S deviation pointer is removed. For NCD in the localizer channel, the runway direction line is removed, and the course pointer is oriented vertically. In either case, 6 green dashes replace the displayed ILS frequency.
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 5)  Failure warning conditions are defined as detected failures within the ILS receiver (navigation unit) itself. For failure warning in either channel, the corresponding pointer and scale are removed and the ILS frequency display is removed.
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HEADING

POINTER
GLIDESLOPE
DEVIATION
POINTERTO-FROMGLIDESLOPEPOINTER
DEVIATION
SCALE

LATERALLATERAL
DEVIATIONDEVIATION
POINTER
SOURCE
ANNUNCIATOR

LATERALDEVIATION LOCALIZERRISING
AIRPLANESOURCE
DEVIATION SCALE RUNWAY SYMBOL
SYMBOL ANNUNCIATOR
　
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