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The MDU-268 Mission Display Unit function is to bring to the crew of an aircraft the output of up to seven video devices, four analog and one digital. It has been developed according to DO-178B and DO-254 requirements (up to Development Assurance Level C for the native XGA DVI input).
The accepted analog video formats are RGB with separate Syncs, RGB with Sync on Green and composite. Both interlaced and non-interlaced signals are accepted. This covers practically all operational cockpit applications (EFIS display, FLIR display, mission display, D-Map display, video display).
· The main feature of the unit is a Barco-ruggedized 6"x8" Active Matrix LCD display.
This High Performance TFT display has XGA resolution (1024x768 pixels), and can show up to 262,144 colors, or 64 shades of gray. This unit has an option to provide 253 gray shades via dithering, notably for FLIR camera applications. The display is back lighted using LED technology, and is equipped with an automatic brightness feedback system.
The MDU-268 can be used indifferently in a landscape or a portrait position (same P/N).
Existing options include:
♦ NVIS B compatible backlight
♦ Picture In Picture (PIP) capability analog-over-digital or -analog
♦ scaling of the analog or digital inputs
♦ rotation of the analog or digital inputs or PIP format
♦ Infra Red Touch Screen control
• The display is integrated into a bezel, supporting 24 control pushbuttons and two rocker switches for brightness and contrast when needed1.
• A keyless bezel is also available.
The pushbuttons can be either Fixed Function Keys, or used as Softkeys to control a remote equipment. The latter scenario can use external generated Softkey labels overlaid on the active video
2. Physical configuration
The bezel shown hereafter is available with 24 pushbuttons and two rocker switches The MDU is built as a single LRU. Typical landscape installation drawings are shown in the figures 1, 2 and 3.
A specifically marked bezel has also been created in order to replace the controlling device of the Euroavionics RN6 D-Map computer: this allows a very easy clean installation of a full D-map system including the MDU-268. This bezel is shown in Appendix A and is available as option for purchasers of MDU/RN6 systems.
Figure 1: Front face view landscape (typical)
Figure 2: Side view landscape (typical)
Figure 3: Back view landscape (typical)
The typical weight for the MDU is
The typical overall dimensions of the unit are (in portrait mode)
The typical dimensions of the back case are (in portrait mode):
The MDU is provided with 4 mounting holes in the front bezel for mounting on the instrument panel of the aircraft with screws M5.
All MDU connectors except the ECRO connector are circular miniature connectors in accordance with standard MIL-C-38999 Series III. Typically, four connectors are present (three are used), J1 for the power, and J2 for the non-DVI signals, J4 for the DVI signal.
The J5 9-pin Sub-D ECRO (Electronic Configuration Read-Out) connector is reserved for ECRO and maintenance interface, and is protected with a screwed-in cover plate. This connector is reserved for Barco use.
The MDU is cooled internally with two fans, and does not need an external cooling flow. "Cold wall" principles are used inside the unit, preventing any contamination of the electronics with outside particles.
The MDU is protected internally and externally from corrosion. All exterior surfaces visible by the crew, including bezel, are painted with lusterless black, except legends and markings specified elsewhere.
2.8 Electrical Interface
2.8.1 Electrical Power Environment
The MDU main power source is 28 VDC electrical power in conformity with MIL-STD-704A.
The MDU also utilizes 2 variable power lines as control voltages for the dimming of either the backlight of the keyboard, of the display or the annunciator. These voltages is 0 - 5VDC, but 0 - 5VAC/400Hz, o - 5V PWM or 0 - 28VDC can be offered as an option.
2.8.2 Power Consumption
The typical power consumption of the MDU does not exceed 70 W at 120 fL and can go as much as 95 W at 250 fL brightness.
Additional power is allowed for heating during extreme low ambient temperatures. Typically, for an cold soak time of 2 hours at
2.8.3 Warm-up time
The MDU is fully operational within 10 minutes following the application of external power from a worst case cold start at - 40 degrees Celsius. The MDU has a readable display within 4 minutes.
2.9 Video Interfaces
The MDU-268 can accept between one to six analog video inputs with following formats, in any combination, as long as the maximum number of analog video input pins is 6 (synchronization inputs are on separate dedicated lines):
• PAL B/G (Composite) (1 pin each)
• SECAM (Composite)(1 pin each)
• NTSC/RS-170 (Composite)(1 pin each)
• S-VIDEO (2 pins each)
• STANAG 3350A/B/C (RGB-SoG)(3 pins each)
• VGA/SVGA/XGA RGB (RGB-SoG)(3 pins each)
• VGA/SVGA/XGA RGB (with composite H & V Sync)(3 pins each)
• VGA/SVGA/XGA RGB (with separate H & V Sync)(3 pins each)
and also accepts a digital DVI input (auto-detection of VGA/SVGA or XGA format). To clarify, here is an example case:
When a RGB (SoG) signal is needed, using pins R1, G1 & B1, it is easily to see what possibilities are left: 3 composites on input pin video4, video5 and video6, or a second RGB (SoG), a RGB with HS/VS or RGB with CS.
2.10 Data Interfaces
The MDU-268 is typically provided with the following I/O:
• 2 RS-422 (general purpose communication line for the DVI input + one additional line)
• RS-232 (maintenance line)
• Discrete I/O: 12 (include 4 for Power_Supply_enable & Fail, and 8 for display configuration, lighting mode discretes and other uses)
Elapsed Time Indicator (ETI, shown on request in maintenance mode on display) and ECRO, available on the dedicated J3 maintenance connector.
2.11 Physical Interfaces
The MDU-268 is typically provided with the following interfaces:
• 24 pushbuttons (optionally no buttons))
• 2 Rocker Switches for Brightness and Contrast
2 Ambient light sensors.
3. Environmental Conditions
The MDU meets the environmental requirements as specified in DO-160E (MIL -STD-810E can be used as an option).
High Temperature (DO-160E
Operating temperature: 70 hours at +
Operating temperature: 30 min at +
Storage/Ground survival temperature: 100 hours at +
Low Temperature (DO-160E
Operating temperature: 20 hours at -
Storage/Ground survival temp.: 48 hours at -
In-Flight Loss of Cooling
As per DO-160E Section 4.5.5 Cat. V 30 min minimum
Altitude (DO-160E Ch. 4, Cat. D1)
Demonstrated Operating altitude: 2 hours at 50.000ft
Decompression test: -
Temperature Variation (DO-160E Ch. 5, Cat. B)
Environmental humidity: 95 % +/- 5% RH
Demonstrated Operating Temp.: 240 hours (10 cycles) at temp of
Operational Shocks (DO-160E
Crash Safety (DO-160E
Water proofness (DO-160E
Fluid Susceptibility (DO-160E
“Monitor Soft” Ltd. is engaged in distribution of the MDU-268 Misson Display Unit according to the Partnership Agreement with BARCO and is ready to provide the Product itself and additional information about it for test operation to all interested recipients of air navigation information (such as airlines, airports and regional governments).