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provides a monochrome video image in RS170 standard to the HUD Computer and FMS CDU.
The Infrared Window (IRW) consists of sapphire glass mounted in an EVS heated fairing. The IRW
has a heating element to protect against ice build up from the outside environment, and to prevent
condensation from the inside of the TRU bay. The EVS Heater Controller (EVSHC) controls the
IRW and fairing heating.
The IRW allows the ISU to see the forward scene of the aircraft, while protecting the ISU from the
outside environment.
The HUD displays the IR image via the projector onto the combiner and generates the raster
symbology that overlays the IR image. When the EVS image clear switch is selected to CLR or
EVS is turned off, the HUD operates in the basic HUD mode.
The HUD interfaces with the ISU and the aircraft systems through ARINC 429 buses and discrete
signals. All communication between the EVS and the aircraft systems are conducted via the HUD
computer.
The EVS controls are located with those for the HUD on the aircraft glare shield panel.
FLIGHT INSTRUMENTS
Flight Crew Operating Manual Rev 7, Dec 01, 2005
CSP 700−5000−6
Volume 2
11−10−98
ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D)
EVS Architecture
GF1110_112
HFPC
HFDS Brightness
Projector and Combiner Tray
IAC
FDR
FMS CDU
EVS Brightness
HFDS On S/W
EVS On S/W
NUC S/W
EVS System
Raster
Image
Clear S/W
Contrast
Brightness
Windows
Temp
Sensor Image
RS−170
EVS Control
ARINC 429
EVS Status
Sensor Image RS−170
28 VDC Bus
115 VAC Bus
EVS Data
ARINC 429
Video Processing
Module
Hand Wheel
Pilot’s
EVS Clear Switch
EVS HUD Controls
Projector
Optical
Unit
Projector
Optical
Unit
(DAU) Symbology
AVIONICS
HFPC Tray Modified Fan
IR Sensor
Unit
IPS
IR Window
Unit
Legend
Existing Signal
New or modified
signal or data
Existing EVS
components
New EVS
components
Other
sub−system
MSK Board and
Ancillary H/W
EVS Ice Protection System Overview
The EVS Ice Protection System (EVS IPS) is comprised of the following units:
· EVS Heater Controller (EVSHC)
· EVS Heated Fairing (EVSHF)
· Infrared Window (IRW)
The EVSHC is located in the nose TRU bay and provides regulation and control of AC current to
the EVS Heated Fairing and Infrared Window.
The power distribution of the EVSHC is controlled using zerocrossed
Heater Power Switches
(HPS) and redundant Fail Safe Relays. To ensure adequate power is distributed to the heater
mats, the controller performs current monitoring and is able to detect both over and undercurrent
faults.
Temperature sensors for control and monitoring are kept in separate channels for redundancy and
the controller can utilize a single sensor to perform both functions in case of failure. This degraded
mode is not annunciated to the pilots, but is logged as a maintenance item in CAIMS.
FLIGHT INSTRUMENTS
Rev 7, Dec 01, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
11−10−99
ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D)
EVS Ice Protection System Overview (Cont’d)
The EVS Heated Fairing is a cast body of aluminium with a heater mat bonded to the inner
surface. The heater mat has 3 zones of differing watt densities to account for the variation of
accretion and heat transfer rates along the body of the fairing.
The EVS Ice Protection System is automatically activated upon selection of either the Left or Right
Cowl Anti−Ice (CAI) switch. No additional pilot action is required to activate the EVSIPS, thus,
when either CAI switch is selected “ON”, a ground discrete from the switch is detected and the
EVSHC enters ice protection mode (IN FLIGHT ONLY). This action activates embedded heaters
within the EVS heated fairing and IRW. The heater controller then monitors the cycle with the use
of embedded RTD temperature sensors. The IRW heater operates in “running wet anti−ice”
configuration, providing sufficient heat only to prevent impinging water from freezing on contact.
This water is free to run back and freeze on the fairing. The fairing, on the other hand is cyclically
de−iced. The period of the de−icing cycle is 180 seconds. However, the duty time the heaters are
actually active within this time frame is varible, depending on the Total Air Temperature.
　
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