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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
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
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
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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
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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
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
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)