MGL Avionics XTreme - EMS User manual

Introduction
The XTreme-EMS is a compact universal engine monitoring system. The XTreme-EMS, which fits a standard 3 1 8”
(80mm) instrument panel hole, contains all the necessary functionality to replace several engine monitoring instruments.
All information is displayed in an easy to read format on a high resolution wide viewing angle 4.3” 1000cd m2 sunlight
readable color display.
All engine sensors are connected to a RDAC (Remote data acquisition unit) which is normally mounted behind the firewall
of the aircraft and then just a simple CAN communication link is necessary to connect the XTreme-EMS to the RDAC.
The XTreme-EMS light weight, small size and high level of functionality makes it an excellent choice for all types of non-
certified aircraft.
XTreme - EMS
Universal Engine Monitoring System
Operating Manual – English 2. 5

XTreme-EMS Operating Manual Page 2
1 Features
• 4.3” high resolution 48 x272, sunlight readable, wide viewing angle, 1 cd/m2 TFT LCD display
• LED backlight (brightness can be adjusted for low light flying conditions)
• Fits standard 3 1/8” (8 mm) aircraft instrument panel hole
• The engine display screen is automatically configured to optimize screen space depending on what
engine parameters has been selected
• SD Card interface for data recording, user splash screens, checklists, graphic information pages, firmware
upgrades
• Records maximum and minimum values of most displayed values
• Built in black box recorder – records all engine data, GPS data (if available) and UL Power ECU data (if
available) to SD card. Data is stored on the SD card in a Comma Separated Value file and can be imported
into programs such as Microsoft Excel and Libre.
• Includes a 1 entry automatic flight log (Records start date & time, flight time, pilot number, Hobbs time
and maintenance time) which can be exported to SD card and can be imported into programs such as
Microsoft Excel and Libre.
• User configurable start up (Splash) screen
• Configurable checklists
• Configurable graphic information displays
• Automatic or manual local magnetic variation
• Dual menu system for quick item selection and user setups
• Sunrise/Sunset calculator
• Firmware upgrades via SD Card
• 1 year limited warranty
• 2x RS232 communication ports (UL Power Interface / External GPS receiver)
• 1x CAN communication port (RDAC-XF / RDAC-XG / MAP / RDAC-CAN interface)
• Rotary control plus 5 independent buttons for easy menu navigation and user input
• External alarm switch output for an external indicator lamp etc
• Support for an external GPS receiver with dedicated GPS display
• Built in RTC (Real Time Clock)
• Wide input supply voltage range of 8 to 3 V DC
• Built in voltage reversal and over voltage protection for harsh electrical environments
• Light weight design
EGT / CHT
• Can measure up to 12 thermocouple channels
• EGT/CHT Temperatures can be displayed in ºC or ºF from -1 ºC to 12 ºC (-148ºF to 2192ºF)
• High accuracy: Built in thermocouple linearization curves and cold junction compensation
• Includes a 25 second EGT/CHT trend graph display of each thermocouple channel
• Records maximum EGT/CHT temperature reached for each channel
• Includes an engine leaning feature
• Includes an engine cruise feature
• Special Rotax 912/914 engine monitor mode utilizing the standard built in Rotax NTC CHT probes
RPM / Rotor RPM
• Single or dual RPM display screens
• Dedicated dual rotor / engine tachometer
• Includes a magneto check function
• RPM can be displayed in RPM or in percentage
• Records maximum RPM reached for each channel
• Programmable RPM labels

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Fuel computer
• Advanced fuel computer with various modes of operation
• Supports single or dual fuel tanks
• Supports one or two fuel flow senders, fuel level senders or fuel injectors
• Supports a single fuel pressure sender
• Differential fuel flow calculations are also supported for fuel return systems
• The Xtreme-EMS has the ability to connect to a NMEA enabled RS232 GPS receiver for range based
calculations. It can also accept a manually entered estimate cruising speed if a GPS is not available.
• Standard automotive fuel level senders can be used, even with odd shaped tanks due to a comprehensive,
multi-point calibration system
• Fuel flow can be displayed in L/hr or in G/hr
• Fuel level can be displayed in Litres or Gallons
Analog Inputs
• 1x Oil pressure display
• 1x Oil temperature display
• 2x Auxiliary analog channel displays which are universal and can be configured to measure Pressure,
Temperature or Current
• Current measurement requires a MGL Avionics Closed Loop Current Sensor
• Pressure can be measured using standard automotive resistive senders (e.g. VDO 2, 5 and 1 Bar), Rotax
4-2 mA senders as well as voltage output pressure senders (e.g. UMA)
• Temperature can be measured using standard automotive resistive senders (e.g. VDO, Westach) as well
as the MGL Avionics precision LM335 semiconductor sensor
• High accuracy: Built in linearization curves for common senders
• Analog channels can be programmed to a user defined curve for custom senders
• Supports the Rotax 4-2 mA pressure sender as used in the 912/914 engines
• Temperatures can be displayed in ºC or ºF
• Pressure can be displayed in psi or bar
• Programmable pressure / temperatue labels
Manifold Pressure
• Manifold pressure can be displayed in millibar (mB) or in inches of Mercury (“Hg”).
• Records maximum MAP reached in permanent memory
• MGL Avionics RDAC-XF MAP required
Timers
• Displays both UTC (Zulu time) and local time
• Time is maintained by an internal lithium battery which can be replaced by the user
• Includes a settable Hobbs meter which is password protected
• Includes an engine running and flight timer
• Includes a programmable maintenance timer for scheduled routine engine maintenance
• Stopwatch timer
Volts
• Can measure voltages up to 3 V (compatible with both 12V and 24V aircraft supplies)
• Contains a programmable low/high voltage alarm to automatically detect alternator failures and bad
batteries
• Records maximum and minimum Volts reached in permanent memory
• Programmable Volrts label
OAT
• OAT (Outside Air Temperature) display

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Current
• Uses the MGL Avionics Closed Loop Current Sensor to measure the aircrafts current load.
• Records maximum and minimum current reached in permanent memory
UL Power ECU Display
• Displays engine information from the UL Power ECU (Engine Control Unit) via the RS232 port
• The Xtreme-EMS has a dedicated UL Power ECU display screen
• Displays warning messages from the UL Power ECU
Rotax 912is
• Displays engine information from the Rotax 912is ECU via the RDAC-CAN interface
• The Xtreme-EMS has a dedicated Rotax 912is display screen
• Displays Engine, Sensor and Device Status messages from the Rotax 921is ECU

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2 XTreme-EMS Layout
2.1 Front layout
2.2 Rear layout
Rotary control. Press
to access the quick
select menus and main
menu
Press for the previous
display screen
Press to advance to the
next display screen
D15 Input connector
(Power, Communications,
OAT probe and alarm output )
Fits into a standard
3 1 8” (80mm) instrument
Panel hole
Metric M4 Mounting Bolts
SD card slot
Press to display the EGT
CHT trend graphs
4.3” high resolution (480x2720,
Sunlight readable, wide viewing
Angle, 1000cd m2 LCD display

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3 Display Screens
Press the left or right most soft keys to cycle through the display screens.
EMS DISPLAY
GPS DISPLAY (External GPS receiver required)
CHECKLIST / INFORMATION DISPLAY

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3.1 EMS Display
3.1.1 Information bar
FLIGHT:
The flight time is automatically reset to zero when a new flight is started (manual or automatic flight detection). The “:” will
flash when a flight is active. The flight timer can be started in the quick select menu (Manual flight mode).
ZULU:
GMT or Zulu time display.
LOCAL:
Local time normally includes an offset from Zulu GMT time. The time offset can be setup in the “TIMERS SETUP” menu.
TIMER:
The Timer can be configured in the quick select menu.
HOBBS:
The XTreme-EMS contains a password protected Hobbs timer. The Hobbs time can be set to the current known engine
time in the “TIMERS SETUP” menu.
MAINT (Maintenance Timer):
This timer is set in engine hours and it will count down to zero when the engine RPM is greater then the “HOBBS
MINIMUM RPM” value as set in the “TIMERS SETUP”. A good use for this function is to set the hours until your next
spark plug change or engine inspection.
The purpose of this function is to assist you in determining remaining hours until maintenance will be required. It is not
intended as a replacement for the aircraft's maintenance log. It is therefore important that the aircraft's maintenance log
be maintained in the normal manner. You should further use your own discretion in performing maintenance earlier than
indicated should any aircraft performance problems arise.

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A maximum of 999 hours can be entered as a maintenance interval. A
reminder message will appear on startup when zero hours are
remaining. The reminder message will automatically disappear after 10
seconds or if the pilot presses any key. Engine running time for the
purpose of the maintenance timer is defined as the run time where the engine RPM is greater than the “HOBBS
MINIMUM RPM” value as set in the “TIMERS SETUP”.
3.1.2 RPM / Rotor / MAP display section
The RPM Rotor MAP section will maximize the space according to which parameter RPM Rotor MAP is enabled. The
RPM, Rotor and MAP parameters can be configured in the “EMS SETUP” menu.
RPM 1, RPM 2 and MAP
enabled.
RPM and MAP enabled.
RPM only enabled
MAP only enabled

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3.1.2.1 Magneto Check Function
Activate the magneto check function in the sub-menu once you have reached your normal run-up RPM. The display will
show the RPM deviation from when the magneto function was activated. Any RPM drops will be displayed as a negative
RPM value, a positive reading indicates an increase in RPM.
Switch the mag to left or right. The RPM should display a negative (drop in) RPM.
Then switch the mags to “Both”. The RPM reading should go back to zero or near
zero. A problem should show up as an excessive drop in one mag and the return to
zero or close to zero incorrectly.
The RPM display will return to the normal display after 60 seconds.
3.1.3 Volts, OAT, Oil Temperature / Pressure, Current and Auxiliary Analog section
This section displays the supply voltage, OAT, oil temperature, oil pressure, as
well as the 2 auxiliary analog channels.
3.1.4 Fuel display section
The XTreme-EMS supports dual fuel flow, dual fuel levels and a single fuel pressure. The fuel section will automatically
try and maximize the display area according to the fuel parameters selected. The fuel parameters can be configured in
the “FUEL SETUP” menu.
3.1.4.1 Single fuel flow and calculated tank level (single tank)
Single fuel flow and fuel level sender (single tank)
Differential fuel flow and calculated tank level (single tank)
Differential fuel flow and fuel level sender (single tank)
Summed fuel flow and calculated tank level (single tank)
Summed fuel flow and fuel level sender (single tank)

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3.1.4.2 Dual fuel flow and calculated tank levels (dual tank)
Dual fuel flow and dual fuel level senders (dual tank)
3.1.4.3 Single fuel flow and dual fuel level senders (dual tank)
Single fuel flow, single fuel level sender, single calculated tank
Differential fuel flow and dual fuel level senders (dual tank)
Differential flow, single fuel level sender, single calculated tank
Summed fuel flow and dual fuel level senders (dual tank)
Summed fuel flow, single fuel level sender, single calculated tank
3.1.4.4 Single/Differential/Summed fuel flow, single fuel level sender, single calculated tank
These modes are nice for multiple fuel tanks whereby one or more tanks are difficult to insert level senders in. Potential
problems such as those listed below can easily be diagnosed by doing side by side comparisons between a calculated
and physical tank.
• Leaks in the fuel system
• Uneven drain of interconnected tanks
• Malfunction of the level sender
• Malfunction of the flow sender
3.1.4.5 Single fuel flow only indicator
This mode is displayed if either fuel flow 1 or fuel flow 2 is selected and no fuel level senders are selected.

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3.1.4.6 Dual fuel flow indicator
This mode is displayed if both fuel flow 1 and fuel flow 2 is selected and the fuel mode is selected for dual flow. Both fuel
level senders are disabled.
3.1.4.7 Single tank level indicator
This mode is displayed if either fuel level 1 or fuel level 2 is selected. Both fuel flow senders are disabled.
3.1.4.8 Dual tank level indicator
This mode is displayed if both fuel level 1 and fuel level 2 is selected. Both fuel flow senders are disabled.
3.1.4.9 Differential/Summed fuel flow
This mode is displayed if both fuel flow 1 and fuel flow 2 is selected and the fuel mode is selected for either differential
or summed.

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3.1.4.1 Calculated Fuel Tanks
Calculated fuel tanks will have the text “CALC” in the fuel bar to indicate that the fuel level is calculated from fuel flow and
that it is not a physical measure of the fuel tank.
3.1.4.11 Fuel Pressure
The fuel pressure bar will be displayed when the fuel pressure has been enabled in the menu system. The below picture
illustrates a single physical fuel tank, with a single flow and fuel pressure enabled.
3.1.4.12 Speed, Range and GPS Fix Status
The speed value will change color depending on the source of the information:
White: The XTreme-EMS is using the cruising speed for the range calculation
Magenta: The XTreme-EMS is using the GPS ground speed for the range calculation

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3.1.5 EGT / CHT display section
The XTreme supports up to 12 thermocouples for EGT CHT. The EGT CHT section will automatically try and
maximize the display area according to the number of EGT CHT selected. The EGT CHT parameters can be
configured in the “EGT SETUP” and “CHT SETUP” menu.
The EGT CHT number will highlight to the indicated the temperature value if “HIGHEST” is selected. The EGT highlight
color is magenta, and the CHT color is cyan.
EGT / CHT Trend graph
The EGT CHT trend displays can be accessed by pressing the 2nd left most button when the engine display screen is
shown. The trend graph displays the last 250 seconds of EGT CHT temperature readings.
High Caution
High Alarm Maximum temperature
reached indicator
Temperature unit
Indicates highest value if
“HIGHEST” is selected or
the highlighted bar value
if “SCANNING” is selected
EGT group indicator
CHT group indicator

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3.2 EMS Quick Select Menu System
Press the rotary control when the EMS screen is displayed to access the EMS quick select
menu.
START FLIGHT:
Select this option to manually start stop a flight. This menu option is only shown if the XTreme-EMS is setup to select the
manual flight option under the “FLIGHT LOG” setup menu. The ':' will flash to indicate that a valid flight is in progress.
FUEL REFILL:
Select this menu option to refill a calculated fuel tank.
Press the “FULL” soft key for a quick fill to the full
reading in the tank setup menu. Press the “EXIT”
soft key when done.
CRUISE SPEED:
Select this menu option to enter your average cruising
speed. If there is no GPS fix or no airtalk airspeed data
available then the Xtreme-EMS will use the average
cruising speed to calculate fuel range. It is advisable to
enter your average cruising speed irrespective if you are
using an external GPS receiver or not. If the GPS signal
is lost during flight then the Xtreme-EMS automatically
defaults to this value.

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LEAN MODE:
EGT information is also very useful for fuel mixture control. As the fuel mixture is leaned, so the exhaust gasses get
hotter. This rise in temperature is a sign of increased combustion efficiency as the optimum mixture setting is approached.
If the leaning progresses past a certain point however, the temperature will begin to drop. This temperature drop is the
result of reduced energy output from the diminished fuel flow. The best operating mixture for aircraft engines is in the
vicinity of this peak EGT reading. The XTreme-EMS has a special Leaning mode, which easily identifies the peak EGT
condition allowing you to adjust your fuel mixture for best performance. Fuel mixture should be adjusted once you have
decided on a suitable cruise power setting (typically 70%). Once leaning mode has been enabled, the "LEAN MODE"
label is displayed at the bottom left of the EMS display to clearly differentiate it from the normal operating mode. As the
fuel mixture is slowly leaned past the point at which the temperature begins to drop (by more than 10°C 15°F), the
absolute EGT temperatures will change to show the EGT reading relative to this peak. The sequential order as each
cylinder peaks is also shown as numeric text under the cylinder. Leaning mode can be canceled by pressing the soft key
to “OFF” or by changing the display screen.
CRUISE MODE:
Once cruise mode has been enabled, the "CRUISE MODE" label is displayed at
the bottom of the EMS display to clearly differentiate it from the normal operating
mode. All EGT and CHT readings are immediately sampled as reference
temperatures for the cruise. The display then shows EGT and CHT values
relative to this reference temperature. Cruise mode can be canceled by pressing
the soft key to “OFF”.
FUEL TOTALS:
Select this menu option to display the fuel totals. Press
the “RESET” soft key to reset the totalisers to zero.
Press the “EXIT” soft key when done.
EGT Temperature
while leaning
EGT Reading relative
to first peaked cylinder
Lean mode indictor
1st cylinder to peak
2nd cylinder to peak

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TIMER:
Select this menu option to configure the timer. Use the
rotary control to adjust the timers reset value. Press the
“UP/DOWN” soft key to select whether the timer must
count up or down, the “START/STOP” soft key to
start or stop the timer and the “ON/OFF” soft key to
enable or disable the timer.
MIN MAX:
Select this menu option to display the maximum and
minimum captured values. Press the “RESET” soft key
to reset the min max values to the current values.
BACKLIGHT:
Select this menu option to adjust the backlight brightness level. This may be desirable
during low light flying conditions. Use the rotary control to adjust the brightness level.
MENU:
Select this menu option to enter the main menu system.

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3.3 GPS Display (External RS232 GPS receiver required)
The GPS page show the GPS information in an easy to read format. Sunrise sunset times as well as the magnetic
variation is shown.
3.4 GPS Quick Select Menu System
Press the rotary control when the GPS screen is shown to access the GPS quick select menu.
BACKLIGHT:
Select this menu option to adjust the backlight brightness level. This may be desirable
during low light flying conditions. Use the rotary control to adjust the brightness level.
MENU:
Select this menu option to enter the main menu system.

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3.5 Information/Checklist Display
The Information Checklist page shows checklists and graphic information pages which are loadable from the SD card.
The last checklist or graphic information page is automatically loaded as startup.
3.5.1 Graphic information pages
The graphic information page allows you to display any type of image on the XTremes high resolution graphics display.
Creating your own graphic information pages
You will need:
·A bitmap picture of your choice (*.BMP, 480x272 pixel resolution)
·The BMP to MIF converter tool can be downloaded free of charge from http: www.mglavionics.co.za or can be found on
the XTreme-EMS distribution SD card).
The BMP to MIF program is used to convert images in Windows BMP format to MIF format. You can use this program to
make your own startup screen (Splash screen) and graphic information pages. The color depth is limited to 256 colors.
Run the BMP image to MIF format converter program.
Load an image file (and remember the location), select the resolution as width (480) and height (272) and press the
process button. The new MIF image will be located in the same directory as the source (.BMP) file. Copy the created file
(.MIF extension) to the Infopage directory on the SD card.
The graphic information file can then be loaded by pressing the rotary
control and selecting “INFO PAGES”. A window containing all the files
with the .MIF extension is shown. Select the desired information page.
The number of information pages that can be stored and displayed
depends on the size of the SD card.

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3.5.2 Checklists
A checklist file is simply a text file created in a word processing program and saved with a .ECL extension. The name of
the file does not matter but we suggest calling it something familiar so you can easily identify it. The length of each text
line must not be more then 60 characters and must be terminated with an Enter (CR). The line will automatically be
truncated at the end of the right hand side of the screen. Each checklist file must not be more then 30 lines.
Copy the created file (.ECL extension) to the checklst directory on the
SD card when you are complete. The checklist file can be loaded by
pressing the rotary control and selecting “CHECKLISTS”. A window
containing all the files with the .ECL extension will shown. Select the
checklist you require. The number of checklists that can be stored and
displayed depends on the size of the SD card.
3.6 Information/Checklist Quick Select Menu System
Press the rotary control when the Info Checklist screen is shown to access the Info checklist
quick select menu.
INFO PAGES:
This menu option selects a graphic information page to display. A window will open displaying all the files with the .MIF
extension in the Infopage directory on the SD card. Press the rotary control over the file you wish to load as a graphic
information page.
CHECKLISTS:
This menu option selects a checklist to display. A window will open displaying all the files with the .XCL extension in the
Checklst directory on the SD card. Press the rotary control over the file you wish to load as a checklist.
BACKLIGHT:
Select this menu option to adjust the backlight brightness level. This may be desirable
during low light flying conditions. Use the rotary control to adjust the brightness level.
MENU:
Select this menu option to enter the main menu system.

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4 Main Menu System
To access the main menu system, press the rotary control knob, scroll down to the “MENU”
option and press the rotary control knob again. Use the rotary control to navigate the menu
system.
4.1 Menu Sub-Bar
Use the menu sub-bar for quick menu navigation. Select the soft key directly under the text to activate the softkey
function. Some soft keys have a x1, x10, x100, x1000 assigned to them. This allows for faster incrementing and
decrementing of the menu settings.