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A selected heading bug is displayed on the horizon line and, when read in conjunction with the conformal heading scale, corresponds to selected heading.
Conformal Drift Bug
The drift bug is displayed below the conformal horizon line when the FPV is more than 5 degrees away from the horizon line and remains in view until the FPV returns within 4.5 degree of the conformal heading line.
If the FPV is near the horizon line, drift can be easily discerned by the FPV lateral displacement from the center of the conformal heading index.
GF1110_082a
Volume 2 Flight Crew Operating Manual Rev 7, Dec 01, 2005
Conformal Drift Bug (Cont’d)
Conformal Selected Heading Bug
Conformal
Heading
Index
Conformal
Heading
Scale
Heading Scale and Index
The partial HSI compass has a range of 200 degrees and is displayed at the bottom center of the combiner. The heading index in the shape of an inverted triangle is located at the top of the scale.
The HSI moves gradually out of view of the combiner when the horizon line lowers with high pitch attitudes. The HSI Compass is not displayed when T/O mode is selected to allow the horizon line to remain conformal as much as possible.
The HSI compass heading information is consistent with the Magnetic/True heading selected on the PFD.
Selected Heading Bug
A selected heading bug is located on the edge of the HSI compass. It is not displayed when located outside of the range of the HSI compass.
Selected Heading Readout
The selected heading readout is located to the left of the HSI compass. The selected heading readout is displayed when:
.
The heading bug is outside the displayed conformal heading scale on the horizon line, or
.
The selected heading value is adjusted by the pilot and for a 10 second time period thereafter.
GF1110_083a
Rev 7, Dec 01, 2005 Flight Crew Operating Manual Volume 2
FLIGHT INSTRUMENTS
Selected Heading Readout (Cont’d)
Selected Heading Bug
Selected HeadingHeadingHeading ScaleIndexReadout
Conformal Course Selected Bug
The conformal selected course bug (or desired track when in FMS navigation mode) consists of an arrow pointing up below the conformal heading scale.
When the selected course value exceeds the displayed heading scale, the arrow is at the end of the conformal horizon line in between the airspeed and altitude tapes with half of the symbol displayed.
Course Selected Readout
The selected course readout is located at the left of the heading scale. It is displayed when the selected course pointer is out of view on the HSI and during course selection. The selected course readout is not displayed when the primary navigation source is the FMS.
Desired Track Readout
The desired track readout is displayed in place of the selected course readout, and is labeled DTK. It is displayed when the FMS is the primary navigation source.
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