ULPOWER UL350 User manual

UL260
UL350
UL390
UL520
Operating
Manual
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 1 of 22
Preface
Thank you for choosing ULPower Aero Engines for your aircraft.
Before starting the engine, carefully read this manual. The Manual will provide you with basic
information on the safe operation of the engine.
If you are unsure about the procedures mentioned in this manual, please contact a ULPower
authorised service point.
We hope you will enjoy flying your ULPowered aircraft.
Remarks
The diagrams and other pictures in this manual show the typical construction. They may not
represent in full detail or the exact shape of the parts which have the same or similar function.
Specifications are given in the SI metric system with the USA equivalent in parenthesis. Where
precise accuracy is not required, some conversions are rounded off for easier use.
In addition to this Operating Manual, please refer to the following:
Installation Manual
Maintenance Manual
Please make sure you have the latest version available of the applicable manual.
Modifications
The information and components/system descriptions contained in this Operating Manual are
correct at the time of publication. ULPower, however, maintains a policy of continuous
improvement of its products without imposing upon itself any obligation to install them on its
products previously manufactured.
ULPower reserves the right at any time to discontinue or change specifications, designs, features,
models or equipment without incurring obligation.
Engine serial number
On all enquiries or spare parts orders, always indicate the engine serial number, as the
manufacturer makes modifications to the engine for further development.
Repeating symbols
This manual uses the following symbols to emphasize particular information. These indications are
important and must be respected.
WARNING : Identifies an instruction which, if not followed, may cause serious injury
including the possibility of death.
Attention : Denotes an instruction which, if not followed, may severely damage the engine
or other components.
Note : Indicates supplementary information which may be needed to fully complete or
understand an instruction.

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 2 of 22
Safety information
The engine should only be installed and operated by persons familiar with the use of the engine
and informed with regard to possible hazards.
Familiarize yourself with the installation, maintenance en operational limits of your ULPower
engine. Failure to follow the instructions in this manuals can result in a serious malfunction or loss
of power in flight , with possible loss of life, injury or damage to the equipment. Limit yourself to
to the operations/ maintenance mentioned in ULPower manuals. If you are uncertain and in need
of extra information please contact a ULPower authorized service centre.
This engine is designed for possible application on aircraft used in VFR conditions which have the
capabilities of controlled gliding without engine power.
You should be aware that any engine may seize or stall at any time. This could lead to a crash
landing and possible severe injury or death. For this reason, we recommend strict compliance
with the maintenance and operation manuals and any additional information which may be given
to you by your dealer.
Never fly the aircraft equipped with this engine at locations, airspeeds, altitudes, or other
circumstances from which a successful no-power landing cannot be made, after sudden engine
stoppage.
Make sure you know what engine your are using. Only engines UL260iSA /UL350iSA/
UL390iSA/UL520iSA are suited for acrobatics (inverted flight, etc.).
It should be clear that the choice, selection and use of this particular engine on any aircraft is at
the sole discretion and responsibility of the aircraft manufacturer, assembler and owner/user.
ULPower makes no warranty or representation on the suitability of its engine's use on any
particular aircraft. Furthermore, ULPower makes no warranty or representation of this engine's
suitability with any other part, component or system which may be selected by the aircraft
manufacturer, assembler or user for aircraft application.
Never run the engine without a propeller or flywheel as this will inevitably cause engine damage
and present a hazard of explosion.
Propeller/flywheel and its attachment with a moment of inertia in excess of the specified value
must not be used and releases engine manufacturer from any liability.
Improper engine installation and use of unsuitable piping for fuel-, cooling- and lubrication system
releases engine manufacturer from any liability.
Unauthorized modifications of engine or aircraft will automatically exclude any liability of the
manufacturer for direct, indirect and/or sequential damage.
Spare parts must meet with the requirements defined by the engine manufacturer. This is only
warranted by use of genuine ULPower spare parts and/or accessories. They are available at the
authorized ULPower distribution- and service partners.
The use of anything other than genuine ULPower spare parts and/or accessories will render any
warranty relating to this engine null and void.
Respect all government or local rules pertaining to flight operation in your flying area. Fly only
when and where conditions, topography, and airspeeds are safe.
Select and use proper and calibrated aircraft instrumentation. This instrumentation is not
included with the basic ULPower engine.
Before flight, ensure that all engine controls are operative. Make sure all controls can be reached
in case of an emergency.
Unless in a run up area, never run the engine with the propeller turning while on the ground. Do
not operate engine if bystanders are close.

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 3 of 22
In the interest of safety, the aircraft must not be left unattended while the engine is running.
Keep an engine log and respect engine and aircraft maintenance schedules. Keep the engine in
top operating condition at all times. Do not operate any aircraft which is not properly maintained
or has engine operating irregularities which have not been corrected.
To eliminate possible injury or damage, ensure any loose equipment or tools are properly secured
before starting the engine.
When in storage protect the engine, fuel, lubrication, induction and exhaust system from
contamination and exposure.
Never operate the engine without sufficient quantities of lubricating oil and cooling air.
Allow the engine to cool at idle for several minutes before turning off the engine.

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 4 of 22
Table of contents
Preface ..................................................................................................................1
Remarks...............................................................................................................1
Modifications.........................................................................................................1
Engine serial number ...............................................................................................1
Repeating symbols ..................................................................................................1
Safety information....................................................................................................2
Table of contents .....................................................................................................4
Engine description and engine views.............................................................................6
Denomination of cylinders..........................................................................................7
UL260 / UL350.......................................................................................................7
UL390/ UL520........................................................................................................7
Description of systems...............................................................................................8
Lubricant system ....................................................................................................8
Fuel system ..........................................................................................................8
Electronic Engine Management system..........................................................................8
Cooling system.......................................................................................................8
Check light ...........................................................................................................9
General operating limits .......................................................................................... 10
Speed................................................................................................................ 10
Requirements about RPM Settings ............................................................................. 10
Running in .......................................................................................................... 10
Performance (ISA: International standard atmosphere) ................................................... 10
Acceleration ....................................................................................................... 11
Oil pressure ........................................................................................................ 11
Oil level ........................................................................................................... 11
Oil temperature ................................................................................................... 11
Cylinder head temperature ..................................................................................... 11
EGT .................................................................................................................. 11
ECU environment.................................................................................................. 11
Manifold air temperature........................................................................................ 12
Outside air temperature ......................................................................................... 12
Relative fuel pressure ............................................................................................ 12
Deviation from bank angle ...................................................................................... 12
Electrical power................................................................................................... 12
Maintenance ......................................................................................................... 13
Engine performance................................................................................................ 14
Operating media .................................................................................................... 15
Fuel.................................................................................................................. 15
Lubricants .......................................................................................................... 15
Standard operation ................................................................................................. 16
Daily/Pre-flight checks........................................................................................... 16
Engine start ........................................................................................................ 16
Prior to take-off................................................................................................... 17
Warming up period:............................................................................................ 17
Idle speed:....................................................................................................... 17
Throttle response: ............................................................................................. 17
Ignition test: .................................................................................................... 17
Take-off............................................................................................................. 17
Cruise ............................................................................................................... 17

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 5 of 22
Engine shut-down ................................................................................................. 18
Engine storage ..................................................................................................... 18
Abnormal operation ................................................................................................ 19
Abnormal running on ignition check ........................................................................... 19
Sudden engine stop ............................................................................................... 19
Reaching maximum engine speed .............................................................................. 19
Exceeding of max. admissible cylinder head temperature ................................................ 20
Exceeding of max. admissible oil temperature .............................................................. 20
Oil pressure below minimum.................................................................................... 20
Exceeding of max. admissible oil pressure ................................................................... 20
Relative fuel pressure deviates from normal ................................................................ 21
Single CHT and/or EGT drop .................................................................................... 21
Knocking ............................................................................................................ 21
Low battery voltage .............................................................................................. 21
Prop Strike ......................................................................................................... 22
Revision ............................................................................................................... 23

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 6 of 22
Engine description and engine views
Please check our installation manual for a detailed engine description / engine view

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 7 of 22
Denomination of cylinders
UL260 / UL350
UL390/ UL520

Operating Manual ULPOWER UL260,UL350,UL390,UL520
M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 8 of 22
Description of systems
Lubricant system
The high volume oil pump, with integrated pressure release valve, takes up oil through a coarse
filter on the oil pick up tube which is located in the wet oil sump.
An impressive amount of pressurized oil is pumped through the oil cooler (optional) and oil filter
before it enters the main oil gallery where it lubricates the essential parts of the engine. Excessive
oil accumulates back into the sump.
Fuel system
Fuel from the tanks is guided through a coarse filter before reaching the electrical fuel pump. This
high volume fuel pump (120l/h) creates a pressurized fuel flow and pumps fuel through a fuel fine
filter towards the injectors and the integrated fuel pressure regulator. Afterwards excessive fuel is
returned to the fuel tank.
Electronic Engine Management system
All ULPower engines are equipped with an electronic injection and ignition system.
The ECU controls the mixture and timing from start-up to shut-down. As a result, in the cockpit,
there is no choke, no primer, no carb heat, and no mixture; just a single lever –the throttle;
The ECU automatically sets the fuel mixture and ignition timing (multiple times per second!). It will
even fine tune the fuel flow to compensate for changes in barometric pressure as well as inlet air
temperature in the inlet manifold/airbox.
With timing corrections to avoid detonation and a built-in rev-limiter (3,300rpm on most engines)
the ECU not only ensures the most efficient power to fuel consumption at any given operating
condition, but it also brings extra safety.
Note: Since the engine is managed electronically and a current is needed to generate the sparks
and operate the fuel pump, the engine cannot run without a working electrical system.
The UL 260 / UL350 engine and fuel pump use maximum 15 Amps (12V DC) to operate
The UL 390 / UL520 engine and fuel pump use maximum 21 Amps (12V DC) to operate
Note: The UL260/UL350 engine comes with an integrated AC generator with external
rectifier/regulator that can supply up to 30 Amps. The UL390/UL520 generator can supply
up to 50 amps This should be sufficient to charge the battery while the engine is operating
and other electrical aircraft systems are in use.
Cooling system
All engines are air and oil cooled. Installing the ram air ducts that come with the engine, is
mandatory. See installation manual for more info on this subject
The installation of an oil cooler is mandatory as the oil is not only used to lubricate but also to cool
the engine. See installation manual for more info on this subject.