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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 7, Dec 01, 2005
CSP 700−5000−6
Volume 2
11−10−102
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 7, Dec 01, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
11−10−103
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
annunciation will be displayed.
When the EVS failure annunciation is displayed while the EVS is commanded off, the pilot can
remove the annunciation on the HUD by toggling the EVS clear switch (NORM to CLR to NORM).
This procedure will not remove the associated EICAS message.
FLIGHT INSTRUMENTS
Flight Crew Operating Manual Rev 7, Dec 01, 2005
CSP 700−5000−6
Volume 2
11−10−104
ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D)
EICAS Messages
HUD FAIL
Indicates an internal failure.
Either a loss of HUD or bad
status bit. (no image displayed)
EVS FAIL
Indicates an EVS failure. Either a
loss of ISS or a bad status bits. The
EVS HEAT FAIL
Indicates the IRW and/or fairing not heated.
Loss of heater control. EVS image may
EVS HEAT OVHT
Indicates an IRW or fairing
overheat. Loss of IPS due to
EVS DEFOG FAULT
Indicates that the IRW is not
defogged. EVS image may
become degraded.
HUD MISALIGN
does not detect alignment beam.
GF1110_108a
HUD will revert to stroke mode. become degraded.
relay being switched off. EVS
image may become degraded.
HUD MISCOMPARE
Indicates sensor mispcompare
not detected by IAC.
HUD FAN FAIL
Indicates a loss of fan cooling
in HUD computer tray. When in
approach, HUD reverts after
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