23 April 2015 Current valid documentation see: 75-00-00

Revision 1 www.FLYROTAX.com Page 1 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

d06013.fm

SB-912-066 R1

SB-914-047 R1

This SB revises SB-912-066/SB-914-047 Initial issue dated 08 December 2014

SERVICE BULLETIN

Change of measurement method from cylinder head temperature to coolant temperature for ROTAX® Engine Type 912 

and 914 (Series)

ATA System: 75-00-00 Cool system

MANDATORY

Symbols used:

Please, pay attention to the following symbols throughout this document emphasizing particular information.

General note

NOTE: Information useful for better handling.

A revision bar outside of the page margin indicates a change to text or 

graphic.

To obtain satisfactory results, procedures specified in this publication must be accomplished with 

accepted methods and prevailing government regulations.

BRP-Powertrain GmbH & Co KG. cannot be responsible for the quality of work performed in 

accomplishing the requirements of this publication.

m

mWARNUNG WARNING Identifies an instruction which, if not followed, may cause serious injury or even fatal injury.

mm CAUTION WARNUNG

Identifies an instruction which, if not followed, may cause minor or 

moderate injury.

m NOTICE WARNUNG Denotes an instruction which if not followed, may severely damage 

the engine or could lead to suspension of warranty.

ENVIRONMENTAL NOTE

Environmental notes give you tips on environmentally conscious behaviour.
 d06013.fm

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

23 April 2015 75-00-00

Revision 1 Page 2 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

1) Planning information

1.1) Applicability

All engines of Series 912 A, 912 F, 912 S and 914 F are affected, if at least one of the following 

criteria applies:

Criterion A) Engine Serial number:

Engines with a serial number listed below, which have a new cylinder head installed at the measuring position of the temperature, are affected.

For part numbers of new cylinder heads see section 1.1.1).

NOTE: Identifying of new cylinder heads: The electrical connection of the temperature sensor is pointing upwards. New configuration see Fig. 2. Old configuration see Fig. 3.

Criterion B):

Further all engines which have been equipped with new cylinder heads as spare part or during 

engine repair/general overhaul since March 1st, 2013 are also affected. For part numbers of new 

cylinder heads see section 1.1.1).

1.1.1) Additional support to criteria A and B:

Part no. of new cylinder heads:

Engine type Serial number

912 A from S/N 4 410 982 up to S/N 4 411 086 inclusive

912 F from S/N 4 413 020 up to S/N 4 413 044 inclusive

912 S from S/N 4 924 544 up to S/N 4 924 910 inclusive

914 F from S/N 4 421 178 up to S/N 4 421 444 inclusive

Engine type

 912 A/F; 914 F 912 S cylinder head 

position

part no. 413235

part no. 413236

 part no. 413185 2/3

part no. 413245

part no. 413246

 part no. 413195 1/4
d06013.fm

23 April 2015 75-00-00

Revision 1 Page 3 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

1.2) Concurrent ASB/SB/SI and SL

In addition to this Service Bulletin the following Service Bulletins/Instructions must be observed 

and complied with:

Service Bulletin SB-912-068/SB-914-049, title “Specification/change of engine configuration and/

or type plate“ current issue.

Service Instruction SI-912-016/SI-914-019, title “Selection of suitable operating fluids“ current 

issue. 

Service Instruction SI-912-020/SI-914-022, title “Running modifications“ current issue.

1.3) Reason

In the course of continuous development and standardization with ROTAX® 912 i Series, new cylinder heads with modifications in its mold have been introduced. Due to these changes the coolant 

temperature instead of the cylinder head temperature in the aluminium will be displayed. Check 

the temperature limit for the new positioned measuring point of the cylinder head displayed in the 

cockpit and if necessary correct its naming (measuring position) and limit. See chapter 3.1.1.

1.4) Subject

Change of measurement method from cylinder head temperature to coolant temperature for 

ROTAX® engine type 912 and 914 (Series).

1.5) Compliance

- Within the next 25 hours of operation, but at the latest by 31 March 2015 the change of measurement method from cylinder head temperature to coolant temperature must be conducted 

according to the following instructions in section 3.

1.6) Approval

The technical content of this document is approved under the authority of DOA ref. 

EASA.21J.048.

1.7) Labor time

Estimated labor time:

Labor time will depend on installation and therefore no estimate is available from the engine manufacturer.

1.8) Mass data

change of weight - - none.

moment of inertia- - - unaffected.

1.9) Electrical load data

no change

1.10) Software accomplishment summary

no change

m NOTICE WARNUNG The cooling capacity is not affected by the change of cylinder heads (new 

configuration).

m

mWARNUNG WARNING Non-compliance with these instructions could result in engine damages, personal injuries or even fatal injury.
 d06013.fm

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

23 April 2015 75-00-00

Revision 1 Page 4 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

1.11) References

In additon to this technical information refer to current issue of

- Operators Manual (OM)

- Illustrated Parts Catalog (IPC)

- Installation Manual (IM)

NOTE: The status of manuals can be determined by checking the table of amendments of the Manual. The 1st column of this table is the revision status.

Compare this number to that listed on the ROTAX® WebSite: 

www.FLYROTAX.com. Updates and current revisions can be downloaded

for free.

1.12) Other Publications affected

none

1.13) Interchangeability of parts

not affected

2) Material Information

2.1) Material- cost and availability

none

2.2) Company support information

- Shipping costs, downtime costs, loss of income, telephone costs etc. or costs of conversion to 

other engine versions or additional work, as for instance simultaneous engine overhauls are 

not covered in this scope and will not be borne or reimbursed by ROTAX®. 

2.3) Material requirement per engine

none

2.4) Material requirement per spare part

none

2.5) Rework of parts

none

2.6) Special tooling/lubricant-/adhesives-/sealing compound

none
d06013.fm

23 April 2015 75-00-00

Revision 1 Page 5 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

3) Instructions/Accomplishment

NOTE: Before maintenance review the entire documentation to make sure you

have a complete understanding of the procedure and requirements.

AccomplishmentAll measures must be implemented and confirmed by at least one of the following persons or 

organizations:

- Persons approved by the respective Aviation Authority

- Persons with approved qualifications to the corresponding engine type. Only certified technicians (iRMT-Level: Heavy Maintenance) are qualified to work on these engines.

NOTE: All work has to be performed in accordance with the relevant Maintenance

Manual.

Safety notice

m

mWARNUNG WARNING Proceed with this work only in a non-smoking area and not close to sparks 

or open flames. Switch off ignition and secure engine against unintentional 

operation. Secure aircraft against unauthorized operation. Disconnect 

negative terminal of aircraft battery.

m

mWARNUNG WARNING Risk of scalds and burns! Allow engine to cool sufficiently and use appropriate safety gear while performing work.

m NOTICE WARNUNG Should removal of a locking device (e.g. lock tabs, self-locking fasteners, 

etc.) be required when undergoing disassembly/assembly, always replace 

with a new one.
 d06013.fm

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

23 April 2015 75-00-00

Revision 1 Page 6 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

3.1) Instructions

The following steps are necessary for checking the relevant indicating instruments of the cockpit:

Fig. 1

3.1.1) Coolant temperature limit (measured at cylinder head measuring point)

Effective for engine serial number criteria A) and B). See section 1.1.

Step Procedure

1 Check the engine serial number S/N, if the aircraft is affected by this SB.

2 Check of maintenance documentation if a repair or maintenance was performed on one of the cylinder heads.

3 Check the part numbers of the cylinder heads. See Fig. 1.

4 Check of the cockpit (indicating instruments) or the aircraft-specific manuals 

or consultation with the aircraft manufacturer or its service facilities if the 

coolant temperature or cylinder head temperature is displayed. 

5 The measurement position naming in the indicating instrument or the operating limit must be amended or corrected in consultation with the aircraft 

manufacturer, if necessary. See section 3.1.1)

10227

part number

Coolant temperature limit for measuring point 

in the cylinder head (new configuration) Engine type

maximum 120 °C (248 °F)

912 A/F/S

914 F

Permanent monitoring of coolant temperature is necessary
d06013.fm

23 April 2015 75-00-00

Revision 1 Page 7 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

3.1.2) Coolant types

Effective for engine serial number criteria A) and B). See section 1.1.

Permissible coolant types:

3.2) Installation relevant changes

See latest Installation Manual for the related engine type.

Regarding change of temperature sensor position, see Fig. 2 and Fig. 3.

NOTE: It is NOT mandatory to retrofit engines with the old cylinder heads. The

different versions of the cylinder heads can be mixed installed, but make

sure, if and at which position the cylinder head temperature and coolant

temperature is measured. This also defines the naming of the indicating

instrument with the appropriate temperature limit.

Fig. 2

m NOTICE WARNUNG When selecting a suitable coolant, the information in Service Instruction 

SI-912-016, latest issue, must be observed.

m NOTICE WARNUNG Using waterless coolant 

is not permitted (e.g. Evans).

Description

1 Conventional coolant based on ethylene glycol.

09862_1

temperature

sensor

position temperature sensor

new configuration
 d06013.fm

SB-912-066 R1

SB-914-047 R1

SERVICE BULLETIN

23 April 2015 75-00-00

Revision 1 Page 8 of 8

Copyright - BRP-Powertrain GmbH & CO KG. All rights reserved.

Fig. 3

3.3) Checking (replacement of the type plates)

Check and/or replace type plates at engines with serial numbers out of Criterion A) and B) in 

accordance with SB-912-068/SB-914-049.

3.4) Test run

none

3.5) Summary

These instructions (section 3) have to be conducted in accordance with the deadlines from section 

1.5. The execution of the mandatory Service Bulletin must be confirmed in the logbook.

Approval of translation to best knowledge and judgement-in any case the original text in German 

language and the metric units (SI-system) are authoritative.

3.6) Enquiries

Enquiries regarding this Service Bulletin should be sent to the ROTAX® authorized distributor of 

your area. A list of all distributors is provided on www.FLYROTAX.com.

NOTE: The illustrations in this document show a typical construction. They may not

represent full detail or the exact shape of the actual parts but have the same

or similar function.

Exploded views are no technical drawings and are for reference only. For

specific detail, refer to the current documents of the respective engine type.

09862

temperature

sensor

position temperature sensor

old configuration