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verifying the normal vision without IR enhancement or to deal with any malfunction of the EVS that
could impair the pilot’s normal view through the combiner and windshield.
GF1110_106
EVS IMAGE
CLEAR SWITCH
Brightness Control
The HUD OFF/BRT control is used to control the overall projector brightness affecting symbology
and image brightness, but not image contrast. The HUD OFF/BRT control and EVS OFF/MAX
control interact in order to make it impossible to provide an EVS image that is brighter than the
symbology brightness. This ensures that symbology is always available in various lighting
conditions.
The EVS image brightness and contrast are controlled by a single contol knob (EVS OFF/MAX).
The 12 O’clock position is the recommended EVS control seting for IMC operations. The EVS
control position may be adjusted to obtain the optimum image in VMC conditions. Turning the EVS
OFF/MAX control knob clockwise increases the IR image illumination. Turning the EVS OFF/MAX
control knob counterclockwise decreases the IR image illumination.
Both EVS brightness and contrast affect only the video signal transmitted by the HUD computer to
the HUD projector.
The EVS OFF/MAX control uses two independent brightness/contrast tables, one for night and
one for day conditions. The HUD ambient light detector provides a voltage, based on sensor
illumination, to the HUD computer to determine which table will be used. This operation is
transparent to the pilot.
Symbology
When the EVS is in normal mode the flight symbology overlays the video image. Except for the
consolidation symbols which are displayed in raster and stroke all other symbology is displayed in
raster format only.
FLIGHT INSTRUMENTS
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
11−10−104
ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D)
Consolidation Symbol
Raster and stroke symbology are aligned to provide conformal flight essential symbols.
In order to ensure correct positioning of the raster symbology, two concentric diamond shaped
symbols will appear after toggling the clear switch (NORM to CLR to NORM within 0.5 second).
These consolidation symbols automatically clear after 5 seconds.
Alignment for conformal raster symbology is assured if the smaller stroke symbol is within the
larger raster symbol, both being diamond shaped. If the stroke symbol is outside the raster symbol
a positioning error of 0.5 degrees has been exceeded and EVS may not be used for approach and
landing.
Prior to final approach a raster symbology alignment consolidation check is required.
NOTE
Since the consolidation symbol is only used to provide a correlation
between conformal stroke and raster symbology it cannot be used to
validate the acuracy of the image alignment.
GF1110_109a
LNAV
EVS ON
Horizon Line
EVS Mode
Consolidation
Symbol
Sensor Calibration
Over time the individual IR detectors of the focal plane array require recalibration to each other. If
the pilot determines that the image is being degraded this function is selected by pressing the CAL
button on the EVS control panel for less than 10 seconds. This activates a short calibration which
removes the IR image for approximately 6 seconds and recalibrates the ISU. This function is
normally used to correct a “burn in” image.
A long calibration (approximately 22 seconds) can also be selected by holding the CAL button
down for more than 10 seconds. The long calibration is intended mainly for maintenance.
A long calibration is performed automatically during system power up.
NOTE
During calibration the IR image is removed from the HUD and FMS
CDU. The symbology is maintained on the HUD display.
FLIGHT INSTRUMENTS
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
11−10−105
ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D)
EVS Status Annunciation
The following EVS status messages can appear on the HUD above the FD Vertical Capture Mode:
• EVS: Indicates that the sensor is commanded on but has not yet reached its operating
temperature.
• EVS CAL: Indicates that the sensor is in the calibration phase following a pilot request.
• EVS CLR: Indicates that the system is capable of displaying an image but the clear switch is
in the CLEAR position.
• EVS ON: Indicates that the sensor image is displayed.
Upon EVS failure, the EVS strike through and boxed annunciation will be displayed.
The strike through and boxed EVS failure annunciation may be displayed even when the EVS
has not been switched on. If the HUD detects a failure of its own video processing capability, the
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