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 met hod from cylinder head tempe**  **rature 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 specif ied in this publication must be accomplished with accepted methods and prevailing govern ment regulations. BRP-Powertrain GmbH & Co KG. cannot be responsible for the quality of work performed in accomplishing the requirements of this publication.



# m **WARNUNG** 

# m **WARNING Identifies an instruction which, if not followed, may cause serious in**  **jury or even fatal injury.**



# m **WARNUNG** 

# m **CAUTION Identifies an instruction which, if**  **not followed, may cause minor or moderate injury.** 



# m **WARNUNG NOTICE**  **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: Th e 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 1 st , 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 1/4d06013.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 Bu lletin 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 inst ead of the cylinder head temperature in the alumin ium 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 (m easuring 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 in structions 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 esti mate is available fr om 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 **WARNUNG NOTICE**  The cooling capacity is not affected by the change of cylinder heads (new configuration).



# m **WARNUNG** 

# m **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 1 stcolumn 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 et c. 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 no t be borne or reim bursed 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** 
noned06013.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.**Accomplish ment**  All measures must be implemented and confirmed by at least one of the following persons or organizations: - Persons approved by the res pective Aviation Authority - Persons with approved qualifications to the co rresponding 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 **WARNUNG** 

# m **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 agains t unauthorized operation. Disconnect negative terminal of aircraft battery.



# m **WARNUNG** 

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



# m **WARNUNG NOTICE**  Should removal of a locking device (e .g. lock tabs, self-locking fasteners, etc.) be required when undergoing di sassembly/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, ifthe 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 instru ments) or the aircraft-specific manuals or consultation with the aircraft manuf acturer 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 necessaryd06013.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 **WARNUNG NOTICE**  When selecting a suitable coolant, the information in Service Instruction SI-912-016, latest issue, must be observed.



# m **WARNUNG NOTICE**  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 configurationd06013.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) hav e 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 regardin g 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 sh ow 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