HORIZONTAL SITUATION INDICATOR (HSI)

HORIZONTAL SITUATION INDICATOR (HSI) DISPLAYS AND ANNUNCIATORS

• Heading display on the HSI has 3 selectable modes: Full compass, Arc, and Map mode.

• Modes are selected by pushing the HSI button.

FULL COMPASS MODE

• Displayed on initialization.

• 360-degree compass view

• Present heading is indicated by a fixed lubber line at the top of the heading scale with a digital heading readout directly above the lubber line.

ARC MODE

• 90 degrees of compass view.

• Weather is displayed when the WX button is pushed.

• When the heading bug goes beyond the display range is displayed and shows the shortest direction to the heading select bug.

MAP MODE

• 90 degrees of compass view.

• Weather is displayed when the WX button is pushed.

• Flight plans are displayed

• Cannot be used for preview mode.

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SELECTED HEADING DIGITAL READOUT AND BUG

• Displays the digital value for the aircraft selected heading.

• Cyan heading select bug is positioned by rotating the HDG SEL knob.

• Pushing the PUSH SYNC button on the HDG SEL knob synchronizes the heading bug and readout to the current aircraft heading.

• When the aircraft selected heading (or the referenced aircraft heading) is invalid, the bug is removed, and digital readout is replaced with

DRIFT ANGLE BUG

• Represented by an inverted solid white triangle displayed on the outside edge of the heading scale.

• The difference between the aircraft heading and the aircraft ground track is the drift angle.

• The drift angle bug is placed on the edge of the heading scale and aligned to the drift angle with respect to the lubber line.

• When the drift angle is 0 degrees, the drift bug fits inside the heading bracket notch.

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PRIMARY NAV SOURCE ANNUNCIATOR

• Selected using the V/L or FMS buttons.

• The V/L(VOR/LOC) button selects the available SRN (short-range navigation) source, displayed in green.

  • The associated annunciators are

• The FMSbutton selects FMS as the source, displayed in magenta.

  • With dual FMS systems installed the identifier will show

• When both sides have the same NAV source selected, digital readout for all information turns amber.

PRIMARY NAV DISTANCE IDENTIFIER

• Displays the NAV source station identifier.

• The next magenta TO waypoint identifier is displayed.

PRIMARY NAV DISTANCE READOUT

• Distances of 100 NM or more, the digits are displayed with 1 NM resolution

• Distances of less than 100 NM, the digits are displayed with 0.1 NM resolution

PRIMARY NAV ESTIMATED TIME ENROUTE

• Time is always displayed in minutes.

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HEADING SOURCE ANNUNCIATORS

• Selected by the IRS reversion buttons.

• Not displayed when the on-side IRS source and magnetic heading are selected.

COURSE SELECT/DESIRED TRACK POINTER AND READOUT

• Green for VOR and LOC navigation and the label is

  • When VOR or LOC is selected, the track pointer is positioned by turning the CRS knob.

  • When the PUSH DIR button in the center of the CRS knob is pushed, the course select value is set to the course that minimizes the lateral deviation.

• Magenta for FMS navigation and the label is

  • Value of the desired track is supplied by the FMS.

• Course deviation bar moves laterally and shows lateral deviation.

• If both sides have the same navigation source selected the pointer, deviation bar, and digital readout turn amber.

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TO/FROM INDICATOR

• Magenta for FMS, Green for VOR or LOC. Turns amber if both sides are selected to the same source.

• Pointer indicates the aircraft is flying to or away from the selected navigation source.

• For a TO indication the triangle is located above the nose of the aircraft symbol.

• The FROM indication is a triangle pointer on the tail of the aircraft symbol.

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COURSE DEVIATION INDICATOR (CDI) AND LATERAL DEVIATION SCALE

• Only displayed when a navigation source is active.

• Deviation bar moves left or right to show the deviation from the selected NAV source.

• When the back course mode is selected, or when tuned to a localizer frequency and the selected course is more than 100 degrees from the aircraft heading, the course deviation automatically reverses to properly sense deviation with respect to the course centerline.

• When lateral deviation data is invalid, the CDI is removed and is displayed in the CDI scale area.

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BEARING POINTERS

• Source is either VOR, ADF, or FMS.

• Source is selected using the buttons on the guidance panel.

GROUNDSPEED

• Displayed in the upper left corner of the HIS just below the airspeed tape.

• When the IRS is invalid the digits are replaced with

DME SOURCE ANNUNCIATOR

• DME source is selected by pushing the V/L button.

• DME source annunciation reflects the short-range navigation source selection.

  • VOR1/LOC1 displays VOR2/LOC2 displays

• When primary NAV source is FMS, the last selected VOR/LOC is used for the DME distance display.

• When the same source is used, the DME data is displayed in amber.

DME STATION IDENTIFIER, DISTANCE, AND TTG READOUT

• DME source station identifier is displayed directly below the DME source annunciator.

• Distance to go to the waypoint identified by the DME station identifier is shown in nautical miles.

• TTG to the waypoint identified by the DME station identifier is shown in minutes.

• When DME is in DME hold mode is displayed in the front of the distance readout.

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