# Austro Engine Engine Mandatory Service Bulletin MSB-E4-036/1: Revision 1, from page 25

- Rights: © Austro Engine. Filed by the FAA in regulations.gov docket FAA-2022-0013; AD 2022-03-03 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Austro Engine Engine Mandatory Service Bulletin MSB-E4-036/1](https://openairdocs.org/service-documents/austro-engine/msb-e4-036-1.md)
- Title as filed: MSB-E4-036_rev.1
- Pages: 31
- PDF: https://openairdocs.org/files/sha256/b4/e6/b4e6f5c16cd15dbac0a44fd1539241fb21bcd396d865c41499ab7b6a0a670629
- Page: https://openairdocs.org/service-documents/austro-engine/msb-e4-036-1/file/b4e6f5c16cd1

## Text

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### Page 25

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 25-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
Fig. 41 
 
Fig. 42 
 
Fig. 43 
 
Fig. 44 
Examples of excessive wear of the cylinder head at camshaft bearings 
 YES NO Consultation with AE required 
Cylinder Head 
acceptable: 
   
 The wear rate of the upper bearing segments, which are located inside the 
cylinder head cover, and upper bearing brackets is normally higher 
compared to the lower bearing surfaces. This is caused by the force of the 
valve springs applied to the camshafts. 
Examine the bearing segments at the cylinder cover and the cylinder cover 
for grooves and/or scratches detectable by finger. 
 
In case of doubt, fill the Appendix III and contact Austro Engine. 
X X X X

### Page 26

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 26-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
Fig. 45 
 
Fig. 46 
Examples of camshaft bearings in not acceptable conditions 
 
Fig. 47 
 
Fig. 48 
 
Fig. 49 
 
Fig. 50 
Examples of camshaft bearings in not acceptable conditions 
 YES NO Consultation with 
AE required 
Camshaft Bearings 
acceptable: 
   
Note:  Examine the inlet/outlet bearings of the camshafts for discoloration, 
wear, grooves detectable by finger. 
In case of doubt, fill the Appendix III and contact Austro Engine 
X 
X 
X 
X X X

### Page 27

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 27-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
Fig. 51 
 
Fig. 52 
 
Fig. 53 
Examples of camshaft in acceptable conditions 
 
Fig. 54 
 
Fig. 55 
 
Fig. 56 
Examples of camshaft in not acceptable conditions 
 
Fig. 57 
Examples of camshaft in not acceptable conditions 
 YES NO Consultation 
with AE required 
Camshaft acceptable:    
Note:  Some bearing positions show a circular discoloration; this is a normal sign 
of the oil supply bore located inside the lower bearing segment. Bearing 
surfaces are acceptable when they have: 
- a homogenous, even surface 
- no circular sensitive running mark detectable by fingernail. 
Camshafts with sensitive running marks detectable by fingernail are not 
permitted for re-use. Replace them by new ones. 
In case of doubt, fill the Appendix III and contact Austro Engine 
X 
X X X 
 
√ 
 
√ 
 
√

### Page 28

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 28-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
Fig. 58  
Fig. 59  
Fig. 60 
Examples of camshaft gear in acceptable conditions 
 
Fig. 61 
 
Fig. 62 
 
Fig. 63 
Examples of camshaft gear in acceptable conditions 
 
 
 
√ 
 
√ 
  
√ 
 
√ 
 
√ 
  
√

### Page 29

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 29-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
 
Fig. 64  Fig. 65 
Examples of camshaft gear in not acceptable conditions 
 
Fig. 66  
Fig. 67   Fig. 68 
 
Fig. 69 
Examples of camshaft gear in not acceptable conditions 
 
Fig. 70 
 
 
Fig. 71 
Examples of camshaft gear in not acceptable conditions 
 YES NO Consultation with 
AE required 
Camshaft gear 
acceptable: 
   
Note:  • Check the gear according to the discoloration criteria provided.  
• Darken gear without clear “overburn” discoloration are acceptable as it is the typical 
colour of the heat treatment of the material (e.g. figs. 61, 62, 63). 
• The possible discoloration shown in the non -acceptable gears is due to high friction, 
which generates heat. When present the typical discoloration is not homogeneous and 
presents different shades from black/blue to violet/bronze.  
• Shades of “ burnt” material are typically present on both f ace of the gear, such 
discoloration is clearly visible on the outer surface of the gear; use a magnifier, if 
required, to check the inner surface.  
• Check also for visible discoloration on the face of the teeth.  
In case of doubt, fill the Appendix III and contact Austro Engine 
 
X 
X 
X 
X X X 
X 
X

### Page 30

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 30-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
Fig. 72 
 
Fig. 73 
Examples of HPP Shaft in acceptable conditions 
 
Fig. 74 
 
Fig. 75 
Examples of HPP Shaft in not acceptable conditions 
 
Fig. 76  Fig. 77   Fig. 78  Fig. 79 
Examples of HPP Shaft in not acceptable conditions 
 YES NO Consultation with 
AE required 
HPP Shaft 
acceptable: 
   
Note:  • Check the shaft according to the discoloration criteria provided.  
• Shaft darken in the lower area (e.g. figs. 74 to 79). 
In case of doubt, fill the Appendix III and contact Austro Engine 
X 
X 
X X 
X 
X 
V V

### Page 31

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-036/1 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
FAX: +43 2622 23000-2711 
 
First Issue Date  Rev. No. Revision Date   Page 
30 Nov. 2021 1 14 Dec. 2021 31-31 
© 2021 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
8. Appendix III 
This form must be filled in case support for inspection is requested to Austro Engine. The form should 
be provided to Austro Engine service, within the photos of the inspected parts. Mark only the 
applicable parts. 
Aircraft Serial Number  
Engine Serial Number  
Service Contacts  
Note: please mark only one the applicable box. In case of not applicable/not performed, left the row blank 
Inspected and found: OK Not OK Pictures 
attached 
HPP Gear    
HPP Shaft    
Camshaft Gear    
Camshaft    
Cylinder Head    
Bearings    
NOTE: 
 
 
 
Filled by: (Name Surname) 
 
Date: (DD.MM.YYYY)

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