Jabiru 3300 User manual

INSTALLATION MANUAL
FOR
JABIRU 3300 AIRCRAFT ENGINE
DOCUMENT No. JEM3302-7
This Manual is a guide to correctly install the Jabiru 3300 engine into an airframe.
If you have any questions or doubts about the contents, please contact Jabiru Aircraft P/L.
Applicable to Jabiru 3300cc Engines, S/No. 33A961 Onwards (Hydraulic Lifter Type)
(Including 33A927, 33A928, 33A947, 33A948, 33A949, 33A950)

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Installation Manual
Jabiru 3300 Aircraft Engine
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1.1 Table of Figures .......................................................................................................................3
1.2 List of Effective Pages..............................................................................................................4
1.3 Model........................................................................................................................................5
1.4 Manuals....................................................................................................................................5
1.5 Specifications...........................................................................................................................5
1.6 Dimensions...............................................................................................................................8
1Engine Mount...............................................................................................................10
2Controls........................................................................................................................12
2.1 Throttle and Choke.................................................................................................................12
2.2 Ignition & Starter Systems......................................................................................................12
3Engine Crankcase Breather, Catch Bottle & Dipstick ...................................................13
4Electrical Equipment.....................................................................................................14
4.1 Alternator................................................................................................................................14
4.2 Regulator................................................................................................................................15
4.3 Ignition....................................................................................................................................16
4.4 Starter Motor ..........................................................................................................................16
4.5 Starter Solenoid......................................................................................................................16
4.6 Battery....................................................................................................................................17
4.7 Wiring Practices .....................................................................................................................17
4.8 Instruments.............................................................................................................................18
4.9 Radio Frequency (RF) Noise Reduction ................................................................................23
5Fuel Supply System......................................................................................................27
5.1 Fuel Tank ...............................................................................................................................27
5.2 Fuel Filtration..........................................................................................................................27
5.3 Mechanical Fuel Pump...........................................................................................................27
5.4 Fuel Flow Meters....................................................................................................................27
5.5 Carburettor.............................................................................................................................27
5.6 Fuel Lines...............................................................................................................................31
6Air Intake System.........................................................................................................32
6.1 Intake Air Heating...................................................................................................................32
6.2 Intake Hose & Air Filter Box...................................................................................................32
6.3 Air Filter..................................................................................................................................34
6.4 Ram Air Bleed........................................................................................................................34
7Exhaust System ...........................................................................................................35
8Propeller & Spinner ......................................................................................................35
9Engine Installation Procedure.......................................................................................37
10 Before First Start.......................................................................................................42
11 Auxiliary Units ...........................................................................................................42
11.1 Vacuum Pump....................................................................................................................42
12 Cooling Systems.......................................................................................................43
12.1 General Principles ..............................................................................................................43
12.2 Flow Visualisation...............................................................................................................45
12.3 Air Inlet & Ram Air Ducts....................................................................................................46
12.4 Oil Cooling..........................................................................................................................48
12.5 Air Outlet.............................................................................................................................49
12.6 Cooling System Testing & Evaluation.................................................................................51
12.7 Pusher Installations ............................................................................................................52
12.8 Amphibian or Seaplane Installations ..................................................................................53
12.9 Slow Speed Installations.....................................................................................................53
13 Appendix A –Wiring Diagrams .................................................................................54
14 Appendix B –Jabiru Aircraft Installation....................................................................55
14.1 Known Airframe / Engine Details........................................................................................55
14.2 Normal Operation Data.......................................................................................................55
15 Engine Installation Checklist .....................................................................................56

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1.1 Table of Figures
Figure 1. Drawing W000509-2 Engine Dimensions.................................................................................................................8
Figure 2. Cylinder Firing Order..................................................................................................................................................9
Figure 3. Distributor Cylinder Map ............................................................................................................................................9
Figure 4. Engine Mount Point Locations .................................................................................................................................10
Figures 5 & 6. Typical Upper Engine Mount, Air Intake Installation........................................................................................11
Figure 8. Choke and Throttle Connections to Carburettor......................................................................................................12
Figure 9. Crankcase Breather Installation...............................................................................................................................13
Figure 10. Ignition & Alternator Detail.....................................................................................................................................14
Figure 11. Electrics Installation to Firewall..............................................................................................................................15
Figure 12. Regulator Plug Wiring Details................................................................................................................................15
Figure 13. Ignition Coil Cooling Tube......................................................................................................................................16
Figure 14. Starter Wiring Details.............................................................................................................................................17
Figure 15. Tachometer Sender Installation.............................................................................................................................18
Figure 16. Tachometer Connections.......................................................................................................................................18
Figure 17. Oil Temperature Sender ........................................................................................................................................19
Figure 18. Oil Temperature Connections................................................................................................................................19
Figure 19. Oil Pressure Sender ..............................................................................................................................................20
Figure 20. Oil Pressure Connections......................................................................................................................................20
Figure 21. Voltage Gauge Connections..................................................................................................................................20
Figure 22. CHT Sender (Thermocouple) Installation ..............................................................................................................21
Figure 23. CHT Terminal Installation ......................................................................................................................................22
Figure 24. CHT sensor between plugs....................................................................................................................................22
Figure 25. RG400 Co-Axial Antenna Cable ............................................................................................................................24
Figure 26. Wiring Diagram......................................................................................................................................................25
Figure 27. Wiring Diagram Key...............................................................................................................................................26
Figure 28. Mechanical Fuel Pump ..........................................................................................................................................27
Figure 29. Carburettor Installation ..........................................................................................................................................28
Figure 30. Carburettor Intake & Balance Tube Detail .............................................................................................................29
Figure 31. Carburettor Schematic...........................................................................................................................................29
Figure 32. Needle Jet (Jabiru Needle)....................................................................................................................................30
Figure 33. Air Intake Connections...........................................................................................................................................32
Figure 34. Air Filter Box Plumbing –Incorrect ........................................................................................................................33
Figure 35. Air Filter Box Plumbing –Correct...........................................................................................................................33
Figure 36. Typical “Cobra Head” Installation on a Jabiru Aircraft ...........................................................................................33
Figure 37. Cobra Head for Installations with Minimum Carburettor Clearance.......................................................................34
Figure 38. Ram Air Bleed........................................................................................................................................................34
Figure 39. Jabiru Propeller & Spinner Installation...................................................................................................................36
Figure 40. Engine Accessory Pack Contents..........................................................................................................................38
Figure 41 Upper & Lower Engine Mount Detail.......................................................................................................................38
Figure 42. Engine Mount Detail...............................................................................................................................................39
Figure 43. Fuel Connections General.....................................................................................................................................40
Figure 44. SCAT Hose Detail..................................................................................................................................................40
Figure 45. Balance Tube Detail ..............................................................................................................................................40
Figure 46. Control Connections to Carburettor.......................................................................................................................41
Figure 47. Cowl Airflow (Best Viewed in Colour).....................................................................................................................44
Figure 48. Cowl Airflow (Black & White Version)....................................................................................................................44
Figure 49. Flow Visualisation..................................................................................................................................................45
Figure 50. Front-On View Into Ram Air Duct ..........................................................................................................................46
Figure 51. Coil Cooling Detail .................................................................................................................................................47
Figure 52. Ram Air Duct Front Seam.....................................................................................................................................47
Figure 53. Air Dam Installation...............................................................................................................................................48
Figure 54. Oil Cooler Duct Design ..........................................................................................................................................49
Figure 55. Oil Cooler Installation.............................................................................................................................................49
Figure 56: Lip to aid cooling as installed on a Jabiru..............................................................................................................50
Figure 57. Affect of Angle of Attack on Cowl Outlets ..............................................................................................................50
Figure 58. Cowl Outlet Geometry............................................................................................................................................51
Figure 59. Outlet Restriction Caused By Flange On Lower Firewall.......................................................................................51
Figure 60: Cooling pressure measurement.............................................................................................................................52
Figure 61: Ram Air duct pressure tapping. .............................................................................................................................52
Figure 62. Augmentor Exhaust System ..................................................................................................................................53
Figure 63. Wiring Details ........................................................................................................................................................54

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1.2 List of Effective Pages
The dates of issue for original & revised pages are:
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Issue Notes:
Rev 0
Original Issue
Rev 1
Rev 2
Rev 3
Re-Format
Rev 4
Rev 5
Change drawing (page 38)
Change EGT probe position from 100 to 120mm (page 36)
Rev 6
Update engine limits.
Change instrument requirements to include CHT and EGT on each cylinder.
Correct Oil pressure limits
Remove Gull Wings from Figure 50
Extra note on oil cooler hose fitment
Rev 7
Add note for Stator leads to be different lengths (section 4.1)
Correct oil pressure 525 kPa max, 350 kPa optimal
Correct Fahrenheit values for EGT’s
Add note for no aerobatic manoeuvres
Most recent changes shown in red text.

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Description
1.3 Model
This Manual applies to all Jabiru 3300 Engine Models, but particularly those from S/No 961 on. Details for
operating and servicing are supplied in the Engine Instruction & Maintenance Manual.
Only those details relevant for installation are duplicated below –for all other information please refer to
the Instruction & Maintenance Manual.
1.4 Manuals
Instruction and Maintenance Manual
Installation Manual
Parts Catalogue
1.5 Specifications
All information given in this manual assumes static sea level ratings under the following conditions:-
International Standard Atmospheric conditions at sea level.
Aircraft service equipment drives unloaded. (Vacuum Pump not fitted)
Full rich fuel/air mixture.
Standard Jabiru air filter and hot air mixer box assembly.
Standard exhaust muffler.
Jabiru Propeller
Jabiru Airframe

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1.5.1 Engine Models
The 3300L engine has a maximum continuous RPM rating of 2850RPM. The engine may be operated at
engine speeds above 2850RPM for up to 10 minutes.
All other engine specifications and limitations are identical to other 3300 models (such as the 3300A).
The 3300L uses the same parts, Parts Books, Servicing, Maintenance and Overhaul Information as other
3300 models.
Unless specifically stated otherwise, all Service Letters, Service Bulletins, Manufacturer Safety Directions
and other service information issued for Jabiru 3300 engines is applicable to 3300L models.
1.5.2 Engine Ratings
Table 1 –Engine Ratings
Model:
3300L
All Other 3300 Models
Maximum Power
90 kW (120 hp) @ 3300 RPM - ISO STD Conditions
Fuel Consumption
35 L/hr @ Takeoff Rating
26 L/hr @ Continuous Rating
35 L/hr @
Takeoff/Max Continuous Rating
Oil Consumption
0.1 L/hr (max)
Note that fuel and oil consumption figures are based on a typical installation in a Jabiru Aircraft. Values will differ
for other installations.
1.5.3 Fuel
Fuel Consumption:................................................... 35 L/hr @ Takeoff Rating
Fuel Consumption:................................................... 24 L/hr @ 75% nominal power setting.
Fuel Pressure to Carburettor Maximum .................. 20 kPa (3 psi)
Fuel Pressure to Carburettor Minimum ................... 5 kPa (0.75 psi)
Recommended Fuel Grade .....................................Avgas 100LL & Avgas 100/130
Note: Leaded and Unleaded Automotive Gasoline above 95 Octane RON may be used, however due to the lack
of a strong quality control system for automotive fuels Jabiru Aircraft recommend using AVGAS wherever
possible. For more details on fuel refer to the latest issue of the service letter JSL007.
1.5.4 Oil
Oil Capacity..............................................................3.5 Litres
Oil –Minimum Temperature for Take-Off................ 40°C (122°F)
Oil –Maximum Peak Oil Temperature .................... 118°C (244°F)
Oil –Continuous Temperature Limits....................... 80°C –100°C (176°F - 212°F)
Oil Pressure –Normal Operations........................... Min 220 kPa (32 psi)
...........................Max 525 kPa (51 psi)
...........................Optimal 350 kPa (51 psi)
Oil Pressure –Idle ................................................... Min 80 kPa (12 psi)
Oil Pressure –Starting & Warm Up.........................Max 525 kPa (76 psi)
...........................Optimal 350 kPa (51 psi)
Oil Consumption ......................................................0.1 L/hr (max)
Oil Standard.............................................................Aircraft engine oil - complying with
............................................................ SAE standard J-1899, or
............................................................ Lycoming Spec. 301F, or
............................................................ Teledyne - Continental Spec MHF-24B
(for more details on oil selection see Engine maintenance manual)

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1.5.5 Additives
Note: No Oil or fuel additives should be used. Use of oil or fuel additives will void warranty.
1.5.6 Cylinder Head Temperature (CHT)
Maximum Peak Cylinder Head Temperature
1
......... 200ºC (392°F)
Maximum Continuous Temperature........................180ºC (356°F)
Note: Time with CHT at between 180°C and 200°C is not to exceed 5 Minutes
1.5.7 Exhaust Gas Temperature (EGT)
EGT Max (Mid-Range / Cruise):.............................. 740°C (1364°F)
EGT Max (Above 70% Power):................................ 700°C (1292°F)
EGT Min (Above 50% Power):……………………... 600°C (1112°F)
Note: An EGT gauge is included as standard equipment on the Jabiru factory built aircraft, for other installations
it is required equipment.
1.5.8 Ground Running Limitations
Ground Idle Speed................................................... 900 RPM (set while engine is hot)
Ground Oil Pressure –Idle / Startup........................ Min 80 kPa (11 psi)
........................Max 525 kPa (76 psi)
Ground Oil Temperature.......................................... Max. 100°C (212°F)
Ground Maximum Cylinder Head Temperature.......180°C (356°F)
Note: If ground temperature limits are reached, shut the engine down or cool it by pointing the aircraft into wind.
1.5.9 Aerobatic Manoeuvres
The engine is not approved for aerobatic manoeuvres
1
Measured with sensor ring fitted under exhaust spark plug.

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1.6 Dimensions
Figure 1. Drawing W000509-2 Engine Dimensions

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1.6.1 Denomination Of Cylinders
Figure 2. Cylinder Firing Order
Cylinder Firing Order: 1 –4 –5 –2 –3 –6
Figure 3. Distributor Cylinder Map

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1 Engine Mount
The design of the engine mount must balance many requirements:
The mount must be strong enough to carry the loads applied by the weight and power of the engine.
The mount must be stiff enough that the engine does not sag or move too much when power is applied.
The mount must position the engine at the correct height and angle so that the engine’s thrust line suits the
aircraft. In most installations, Jabiru Engines need to have their thrust axis offset to the right (tractor
installations) by between 1° and 2°.
The mount must position the engine at the right place. The weight of the engine is a very significant part of
the overall aircraft weight, and it’s position must be calculated to place the centre of gravity of the aircraft
(CG) in the right spot.
The mount must be designed to allow enough room for the air intake to the Carburettor as well as
accessories like vacuum pumps. Access for maintenance must also be considered.
The final design of the engine mount is a compromise, and sometimes special parts will be required to make
it work. For example to give a good CG location the engine may have to be mounted as close to the firewall
as possible. This meant that custom air intake tubes will be required to get the intake air to the carburettor
with a minimum disturbance and turbulence.
The engine has four engine mounting points located at the rear of the engine (shown in Figure 1 or Figure 4)
from which the engine is to be mounted. An optional bed mount may be fitted.
Figure 4. Engine Mount Point Locations
Each engine mounting point is rubber mounted to damp the engine vibrations. The correct installation of
these rubbers is shown below Figure 42.
If required, corrections of the engine angle or propeller position can be made by fitting spacers under the
rubber cushions. The maximum spacer thickness on any one mount is 3mm.

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Figures 5 & 6. Typical Upper Engine Mount, Air Intake Installation
Custom air intake tube (“Cobra Head”)

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2 Controls
This section comprises of the mechanical controls and electrical switches.
2.1 Throttle and Choke
The throttle and choke cables both attach to the cable mount arm fitted to the carburettor.
Note: Since a pressure compensating carburettor is used there is no mixture control.
The cables for the choke and throttle can be adjusted using the adjuster screws and nuts shown in Figure 7.
A 7mm spanner is required.
The cables used must have an adequate radius wherever they turn a corner. Bending the cables too sharply
will increase the cable friction, making it difficult to use the control accurately. This is a particular problem
for the throttle cable as it will make setting the idle accurately very difficult.
All Jabiru engines are run-in on a Dynamometer before delivery. It is impossible to accurately set the idle
RPM when the engine is on the dynamometer, so the Idle Stop Screw (shown in Figure 7) must be adjusted
as a part of the engine installation process.
Figure 7. Choke and Throttle Connections to Carburettor
2.2 Ignition & Starter Systems
The only electrical controls for the Jabiru Engine are the ignition switching and the start button.
The ignition switches and starter system wiring are connected as shown by the circuit diagram, Figure 27.
Section 4 gives details of the electrical systems for the engine.
Throttle Cable connected
to throttle arm
Choke Cable connected
to throttle arm
Cable mount bracket
Adjustors to fine tune choke
and throttle operation
Idle stop screw

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3 Engine Crankcase Breather, Catch Bottle & Dipstick
The Jabiru 3300 engine has a crankcase breather connection built into the dipstick housing. This is to be
connected as shown in Figure 8 below.
The catch bottle is designed to catch most oil vapour from the crankcase breather air. It must be monitored
in service and periodically emptied of waste oil.
Figure 58 shows more clearly the outlet from the catch bottle –the catch bottle outlet is secured in the cowl
outlet. The position of this outlet and the catch bottle itself must be assessed and oriented so that the
crankcase of the engine is exposed to pressure close to ambient. If the breather is open to a high or low
pressure (partial vacuum) area the pressure inside the crankcases will also change, with unpredictable
effects on engine oil consumption, and oil flow within the engine. This is because several areas of the
engine are lubricated via low pressure or spray oil feeds, and drained by gravity –pressure differences
cause airflow changes, and modified airflow can significantly affect the oil feeds in these areas.
When installed in a tail-dragger aircraft, re-calibration of the dipstick will be required by the owner so that it
can be read accurately with the aircraft sitting on it’s wheels.
Figure 8. Crankcase Breather Installation
Catch bottle
attached to firewall
Hose from engine
Hose to outlet
Hose from engine
to catch bottle

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4 Electrical Equipment
4.1 Alternator
The alternator fitted to the Jabiru 3300 engine is a single phase, permanently excited with a regulator.
The rotor is mounted on the flywheel and the stator is mounted on the alternator mount plate at the back of
the engine. The alternator mount plate is also the mount for the ignition coils and the vacuum pump.
Note: The electrical system is Negative Earth
The Alternator stator leads must be of different lengths (at least 25mm difference). This helps to ensure an
electrical short between the two leads cannot take place between connectors (see Figure 10)
Specifications
Power (Max): 200W Continuous
Figure 9. Ignition & Alternator Detail
Figure 10 - Alternator leads must be of different lengths
Alternator rotor –
mounted on flywheel
Alternator stator –
mounted on alternator
mount plate fixed to rear
of engine.
Ignition coil (1 of 2)
Wire to ignition switch
Ignition magnets –
mounted on flywheel

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4.2 Regulator
The regulator has been selected to match the voltage and current of the integral alternator. Only Jabiru Part
No. PI10652N should be used. (The regulator output voltage is 14 volts + 0.8 volt.).
Recommended wiring of regulator is positive and negative of the regulator directly to the battery. A 20A fuse
or circuit breaker may be used between the regulator & battery
The regulator is equipped to illuminate a Low Voltage Warning Light. Refer to Figure 12 for plug pin details.
Figure 11. Electrics Installation to Firewall
Figure 12. Regulator Plug Wiring Details
Starter Solenoid
Regulator (Grey, finned block)
Regulator Plug
Power / Earth cables to starter motor
Firewall

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4.3 Ignition
The ignition unit is a dual breakerless transistorised ignition with the magnets mounted on the flywheel and
the coils mounted on the alternator mount plate. Figure 9 shows the coils of a Jabiru 6-cylinder engine.
The current from the coils flows to the distributor from where it is distributed to the spark plugs.
The ignition is turned OFF by grounding the coils via the ignition switches. This is the reverse of most
electrical systems: when the ignition switch is in the open (not connected) position the coil is LIVE and will
fire. Wiring details are shown in Figure 26.
The ignition is timed to 25° BTDC. Ignition timing is fixed –it is set by the position of the flywheel magnets
relative to the crankshaft.
The temperature limit for the ignition coils is approximately 70°C. This should be checked by the installer. It
is recommended that pipes of 12mm dia be fitted to the top rear of each air duct directing air onto the coils
for cooling purposes.
Coil gaps are set at 0.25mm to 0.30mm (0.010” to 0.012”).
When installing new ignition coils the output leads go in the directon of prop rotation. RHS coil output lead
is up LHS coil output lead goes down –See Figure 9.
Figure 13. Ignition Coil Cooling Tube
4.4 Starter Motor
The starter is mounted on the top of the engine and drives the ring gear on the flywheel.
The motor is activated by engaging the starter button (the master switch has to be ON) which trips the
solenoid, hence current flows from the battery to the motor.
The cable from Battery to starter should be minimum 16mm2copper.
Wiring details are shown in Figure 26.
4.5 Starter Solenoid
The starter Solenoid is mounted on the firewall as shown in Figure 11.
The Solenoid body forms a part of the electrical circuit and MUST be earthed to function correctly.
Ram air cooling duct
Coil cooling tube
Ignition coil

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Figure 14. Starter Wiring Details
4.6 Battery
The battery should be of a light weight, 12V, 20 Ah type able to accept a charging voltage up to 14 V (+
0.8V) and a 30 AMP Input.
For optimum starting the battery used must have a high Cranking Amp Capacity (also known as Pulse Amp
Capacity). The standard battery used by Jabiru Aircraft has a Pulse Amp rating of 625 Amps. Batteries with
higher Pulse Amp ratings may be used and will improve engine starting in colder climates.
4.7 Wiring Practices
Using aircraft grade wiring is strongly recommended. Compared to other grades of wire aircraft grade can
carry higher currents for the same physical size and weight. The insulation used on aircraft grade wire is
also frame resistant and is designed for better resistance to damage caused by chaffing or rubbing.
Care should be taken to identify each wire via labels or similar. This makes troubleshooting electrical issues
much easier.
Wherever possible wires should be identified as carrying “Power” or “Earth”. This can be done by using
different colour connectors or applying rings of coloured heat-shrink during assembly. Again, this step
simplifies troubleshooting or later modification.
Wires should be laid out in bundles and supported along their length to prevent failures due to fatigue.

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Installation Manual
Jabiru 3300 Aircraft Engine
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4.8 Instruments
4.8.1 Electronic Tachometer
General wiring information for the Tachometer is given in the Wiring Diagram, Figure 26. Detailed
instructions on it’s installation are supplied by the instrument manufacturer.
The tachometer picks up on 2 metal tabs attached to the inside of the flywheel.
The Pickup used is a Magnetic Induction sender type. It is a passive device requiring no external power.
They Pickup outputs a voltage in response to variations in their self-induced magnetic field caused by
proximity to moving ferrous metal parts (such as the tags fitted to the rear of the flywheel).
The Tachometer sender must be adjusted to have approximately a 0.4mm gap between the tip of the sender
and the tag. Note that due to normal bearing clearances the crankshaft moves slightly when the engine is
running, so if this gap is set too small the sender will hit the tag. The sender is fragile and most times
damage like this means that the sender must be replaced. If the gap is different for each of the two tags
then one tag can be carefully bent to be the same as the other.
Ensure gauge is reading correctly. While large errors will be obvious, smaller errors are harder to pick and it
is recommended to check the gauge reading with another instrument (such as a hand-held optical prop-
tach).
Figure 15. Tachometer Sender Installation
Figure 16. Tachometer Connections
Tachometer Sender
8 7 6 5
4 3 2 1
Connect to Earth Bus
Connect to positive, such as
the Instrument Wiring Bus
Connect to Black wire of
tachometer pick-up
Connect to Red Wire of
tachometer pick-up

Jabiru Aircraft Pty Ltd
Installation Manual
Jabiru 3300 Aircraft Engine
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4.8.2 Oil Temperature Gauge
The Oil Temperature Gauge uses an electric probe mounted in the base of the sump. Jabiru Part No.
PI10752N is recommended.
The gauge has 3 pins, one marked “+” – which is connected to power, one “S” – which is connected to the
sensor and one un-marked –which is connected to earth.
The temperature sender is a brass fitting installed in the engine sump beside the drain plug.
The oil temperature relies on a good earth connection between the sensor, the engine and the airframe
earth terminal. If there is excess resistance at any of these points gauge reading errors will occur.
Figure 17. Oil Temperature Sender
Figure 18. Oil Temperature Connections
+ S
Oil Temperature sender with
wire connected
Engine sump drain plug

Jabiru Aircraft Pty Ltd
Installation Manual
Jabiru 3300 Aircraft Engine
REVISION
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4.8.3 Oil Pressure Gauge
An electric oil pressure sender is fitted to the engine for an Oil Pressure Gauge. Jabiru Part No. PI10762N
is the recommended gauge.
The gauge has 3 pins, one marked “+” – which is connected to power, one “S” – which is connected to the
sensor and one un-marked –which is connected to earth.
Figure 19. Oil Pressure Sender
Figure 20. Oil Pressure Connections
4.8.4 Voltage Gauge (Optional)
A voltage gauge can be connected to the aircraft systems.
The gauge has 2 pins, one marked “+” – which is connected to power and one un-marked –which is
connected to earth.
Figure 21. Voltage Gauge Connections
+ S
+ S
Oil Pressure sender with
wire connected
Oil filter