The engine Rotax 912 ULS2 has a dry sump forced lubrication system. The oil pump
(3,  Fig.  79-1)  is  driven  by  means  of  camshaft.  The  oil  accumulates  at  the  bottom
of  crankcase  and  it  is  forced  back  to  the  oil  tank  (4)  by  energy  of  gassed
in the crankcase. The oil pump sucks the engine oil from the oil tank, through the oil
thermostat  (9)  and  oil  filter  (6)  and  ensures  the  engine  lubrication.  In  dependence
of  temperature,  the  oil  thermostat  opens  the  circuit  of  oil  cooler  (5).  The  oil  tank  is
equipped with a venting hose (7).

NOTE

Refer to the Maintenance Manual (Line Maintenance) for Engine Type
912 Series, Ref. No.: MML-912 for additional information.

–

Pressure relief valve

–

Oil filter

–

Oil pressure sensor

–

Oil tank venting

–

Oil pump

–

Oil temperature sensor

–

Oil tank

–

Oil thermostat

–

Oil cooler

Fig. 79-1 Oil System

Effectivity:

ALL

28. 04. 2021

OIL

2. TROUBLESHOOTING

TROUBLE

POSSIBLE CAUSE

REMEDY

High oil temperature
indication.

Thermostat damaged or
held open by solid matter.

Replace thermostat.

Oil viscosity too high.

Drain and refill with
correct oil grade
(Chapter 12-00).

Prolonged ground
operation.

Limit ground operation
to a minimum.

High power, low airspeed. Adjust power - flight

altitude.

Low oil supply.

Replenish oil supply.

Cooler air passages
clogged.

Clean cooler thoroughly.

Malfunctioning sensor.

Check sensor. Replace
if required.

Low oil pressure
indication.

Low oil supply.

Replenish oil supply.
(Chapter 12-10)

Oil viscosity too low

Drain and refill with
correct oil grade
(Chapter 12-00).

Pump producing low
pressure.

Replace pump.

Malfunctioning sensor.

Check sensor. Replace
if required.

OIL SYSTEM

OIL

79-20

OIL SYSTEM

1. DESCRIPTION

This  chapter  describes  storage  of  oil  and  portion  of  the  oil  system  that  is  used
to conduct oil from and to the engine. These items include the oil tank, oil cooler and
oil thermostat.
Oil  tank  is  attached  at  firewall  on  the  right  side  and  for  oil  level  check  is  available
through the door on the upper engine cowling.
Max. oil system capacity:

Approx. 3.5 liters

Oil consumption:

Max. 0.06 l/h

Maintenance practices and procedures concerning oil volume check/replenishing and
oil change are mentioned in Chapter 12-10.

NOTE

Recommended oils are mentioned in the Rotax Service Instruction
No. SI-912-016

–

the latest issue.

Oil cooler (5, Fig. 79-1) is attached in the ram air tunnel on the right side of lower engine
cowling. For oil temperature regulation the oil thermostat (9) is installed. Depending
on oil temperature oil flows to the oil pump (3) directly or through the oil cooler (5). Oil
thermostat is installed between the oil tank (4), oil cooler (5) and oil pump (3).

Effectivity:

ALL

28. 04. 2021

OIL

2. MAINTENANCE PRACTICES

A. Oil tank

Type of maintenance:

Line

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 4

1 pc

Screwdriver 5

1 pc

Pliers

1 pc

Oetiker pliers

1 pc

Lockwire

0.8 mm

Maintenance Manual (Line Maintenance) for Rotax Engine
Type 912 Series, Ref. No.: MML-912

Persons

Tab. 79-1 Recommended tools, materials, persons and documentation

WARNING

ENGINE IGNITION MUST BE SWITCHED OFF.
CARELESS DRAINING OF HOT ENGINE OIL MAY CAUSE
SCALDS. DISPOSE OF USED OIL AND FILTERS RESPECTING
THE ENVIRONMENTAL AND SAFETY REGULATIONS.

(1) Oil tank removal:

(a) Make sure that the

IGNITION

switches are set

OFF

(b)  Remove the engine cowlings (Chapter 71-10).
(c)  Drain the oil from the oil system (Chapter 12-10).
(d)  Disconnect hoses (7; 8; 9, Fig. 79-2) from tank (1) by removing safety

clamps (10; 11).

(e) Remove lockwire (6), release universal clamps (2) and remove tank

(1).

(f)

Install protective plugs on the hoses and oil tank elbows.

OIL SYSTEM

OIL

–

Oil tank

–

Distance tube

–

Venting hose

–

Universal clamp

136 6

–

Lockwire

–

Safety clamp 20.7

–

Screw of lock

–

Inlet hose

–

Safety clamp 17.5

–

Nut M4

–

Outlet hose

Fig. 79-2 Oil Tank Removal / Installation

Effectivity:

ALL

28. 04. 2021

OIL

(2) Oil tank installation:

(a) Make sure that the

IGNITION

switches are set

OFF

(b) Put oil tank (1, Fig. 79-2) to the appropriate position in the holder

and secure it with universal clamps (2); secure universal clamps (2)
with lockwire (6) (see Chapter 20-20).

(c) Remove protective plugs from the hoses and oil tank elbows.
(d) Slide hoses (7; 8; 9) on the appropriate elbows on the oil tank (1);

secure them with safety clamps (10; 11).

(e) Check if hoses are firmly secured and sealed.
(f)

Replenish the oil system (Chapter 12-10).

(g) Carry out engine ground test; check oil system for leaks and oil system

indication.

(h) Install the engine cowlings (Chapter 71-10).

B. Oil cooler

Type of maintenance:

Line

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 12

1 pc

Wrench 14

1 pc

Wrench 18

1 pc

Screwdriver 5

1 pc

Pliers

1 pc

Oetiker pliers

1 pc

Lockwire ø0

.8 mm

Cooper gasket ring

ø14

.2 x 20 x 2

2 pcs

Maintenance Manual (Line Maintenance) for Rotax Engine
Type 912 Series, Ref. No.: MML-912

Persons

Tab. 79-2 Recommended tools, materials, persons and documentation

WARNING

ENGINE IGNITION MUST BE SWITCHED OFF.
CARELESS DRAINING OF HOT ENGINE OIL MAY CAUSE
SCALDS. DISPOSE OF USED OIL AND FILTERS RESPECTING
THE ENVIRONMENTAL AND SAFETY REGULATIONS.

OIL SYSTEM

OIL

(1) Oil cooler removal:

(a) Make sure that the

IGNITION

switches are set

OFF

(b)  Remove the engine cowlings (Chapter 71-10).
(c)  Drain the oil from the oil system (Chapter 12-10).
(d)  As necessary, disconnect hose (7, Fig. 79-2) from the nipple on the oil

tank.

(e) Disconnect hoses (9; 10, Fig. 79-3) from oil cooler (1) by removing

safety clamps (14).

(f)

Suck oil from oil thermostat (2).

(g) Loose nuts (7) and remove the oil cooler (1).
(h) As necessary, unscrew and remove elbows (3), reducers (4), gasket

rings (5), nuts (7) and washers (6).

(i)

Install protective plugs on the hoses and oil cooler screw couplings.

(2) Oil cooler installation:

(a) Make sure that the

IGNITION

switches are set

OFF

(b) Remove protective plugs from the hoses and oil cooler screw

couplings.

(6, Fig. 79-3), slightly screw nuts (7), install new gasket rings (5), screw
and tighten reducers (4) and slightly screw elbows (3).

(d) Put oil cooler (1) to the tunnel and tighten nuts (7).
(e) Slide hoses (9; 10) on the appropriate elbows on the oil cooler (1);

secure them with safety clamps (14); tighten elbows (3).

(f)

Check if hoses are firmly secured and sealed.

(g) Replenish the oil system (Chapter 12-10).
(h) Carry out engine ground test; check oil system for leaks and oil system

indication.

(i)

Install the engine cowlings (Chapter 71-10).

Effectivity:

ALL

28. 04. 2021

OIL

Fig. 79-3 Oil Cooler and Thermostat Removal / Installation (page 1 of 2)

OIL SYSTEM

OIL

–

Oil cooler

–

Ram air tunnel

–

Oil thermostat

–

Oil hose

–

Elbow

–

Oil hose

–

Reducer

–

Oil hose

–

Cooper gasket ring

ø14

.2 x 18 x 2

–

Oil hose

–

Washer

ø22

.5 x 40 x 6

–

Hose clamp

19 - 12

–

Nut

–

Safety clamp 20.7

Fig. 79-3 Oil Cooler and Oil Thermostat Removal / Installation (page 2 of 2)

Effectivity:

ALL

28. 04. 2021

OIL

C. Oil thermostat

Type of maintenance:

Line

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Pliers

1 pc

Lockwire ø0

.8 mm

Maintenance Manual (Line Maintenance) for Rotax Engine
Type 912 Series, Ref. No.: MML-912

Persons

Tab. 79-3 Recommended tools, materials, persons and documentation

WARNING

ENGINE IGNITION MUST BE SWITCHED OFF.
CARELESS DRAINING OF HOT ENGINE OIL MAY CAUSE
SCALDS. DISPOSE OF USED OIL AND FILTERS RESPECTING
THE ENVIRONMENTAL AND SAFETY REGULATIONS.

(1) Oil thermostat removal:

(a) Make sure that the

IGNITION

switches are set

OFF

(b)  Remove the engine cowlings (Chapter 71-10).
(c)  Drain the oil from the oil system (Chapter 12-10).
(d)  Disconnect  hoses  (9;  10;  11;  12,  Fig.  79-3)  from  thermostat  (2)

by removing safety clamps (13) and remove thermostat (2).

(e) Install protective plugs on the hoses and oil thermostat necks.

(2) Oil thermostat installation:

(a) Make sure that the

IGNITION

switches are set

OFF

(b) Remove protective plugs from the hoses and oil thermostat necks.
(c) Slide hoses (9; 10; 11; 12, Fig. 79-3) on the appropriate necks

on the oil thermostat (2); secure them with safety clamps (13).

(d) Check if hoses are firmly secured and sealed.
(e) Replenish the oil system (Chapter 12-10).
(f)

Carry out engine ground test; check oil system for leaks and oil system
indication.

(g) Install the engine cowlings (Chapter 71-10).

INDICATING

OIL

79-30

INDICATING

1. DESCRIPTION

The  oil  temperature  sensor  (8,  Fig.  79-1)  for  reading  of  the  oil  inlet  temperature
is screwed into the oil pump housing. Signal from the sensor is carried to the engine
monitoring system unit Dynon EMS 220 (Chapter 77-40) and from there to the Dynon
SkyView SV-D1000 (Chapter 39-10).
The oil pressure sensor (2) is screwed into the crankcase on the right side of engine.
Signal from the sensor is carried to the engine monitoring system unit Dynon EMS 220
(Chapter  77-40)  via  low  value  warning  unit  (Chapter  31-50)  and  from  there
to  the  Dynon  SkyView  SV-D1000.  Low  oil  pressure  (less  than  2  bar  /  29  psi)
is  signalized  with  the

OIL PRESS

warning lamp (Chapter 39-10) controlled by low

value warning unit.
Wiring diagram of sensors connection is described in the Aircraft Wiring Manual
(Doc. No. AS-AWM-01-000).

Effectivity:

ALL

28. 04. 2021

OIL

2. MAINTENANCE PRACTICES

A. SV-D1000 display

For removal / installation procedures refer to Chapter 39-10.

B. SV-EMS-220 module

For removal / installation procedures refer to Chapter 77-40.

C. Low value warning unit

For removal / installation procedures refer to Chapter 31-50.

D. Oil pressure sensor

For removal / installation procedures refer to Chapter 77-40.

Oil temperature sensor

For removal / installation procedures refer to Chapter 77-40.

CONTENTS

OPTIONAL EQUIPMENT

95 OPTIONAL EQUIPMENT

CONTENTS

GENERAL ......................................................................... 3

INTRODUCTION ....................................................................... 3

95-10

TOWING EQUIPMENT ...................................................... 5

DESCRIPTION .......................................................................... 5

MAINTENANCE PRACTICES ................................................... 6

Towing equipment preparation .......................................... 6

Tow release handle ........................................................... 8

Tow release equipment ................................................... 11

Rear-view mirror .............................................................. 18

Voltage converter ............................................................ 20

Weak links in tow rope..................................................... 22

GENERAL

OPTIONAL EQUIPMENT

95-00 GENERAL

1. INTRODUCTION

This chapter describes preparation for future installation of towing equipment
and contains information about installation of towing equipment (towing version).

Content .. 43 44 45 46 ..