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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.
Rev 7, Dec 01, 2005 Flight Crew Operating Manual Volume 2
FLIGHT INSTRUMENTS
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.
EVS
Upon EVS failure, the strike through and boxed annunciation will be displayed.
EVS
The strike through and boxed
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.
Volume 2 Flight Crew Operating Manual Rev 7, Dec 01, 2005
ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D)
EICAS Messages
EVS FAIL EVS HEAT FAIL
Indicates an EVS failure. Either a Indicates the IRW and/or fairing not heated. loss of ISS or a bad status bits. The Loss of heater control. EVS image may HUD will revert to stroke mode. become degraded.
HUD FAIL
Indicates an internal failure.
EVS HEAT OVHT
Either a loss of HUD or bad
Indicates an IRW or fairing
status bit. (no image displayed)
overheat. Loss of IPS due to relay being switched off. EVS
image may become degraded. Indicates that the IRW is not defogged. EVS image may become degraded.
EVS DEFOG FAULT HUD MISCOMPARE
Indicates sensor mispcompare
HUD MISALIGN
not detected by IAC.
Indicates that the combiner unit
does not detect alignment beam.
HUD FAN FAIL
Indicates a loss of fan cooling HUD ON in HUD computer tray. When in Indicates that the HUD has been approach, HUD reverts after selected ON. 2 min to stroke mode.
HUD ON
EVS ON
that the EVS image is displayed.
HUD ON
EVS CLEAR
Indicates that the EVS is available but the display has been cleared using the CLEAR switch.
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