# Austro Engine Mandatory Service Bulletin MSB-E4-043/0: No revision named

- Rights: © Austro Engine. Filed by the FAA in regulations.gov docket FAA-2024-2313; AD 2024-19-10 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Austro Engine Mandatory Service Bulletin MSB-E4-043/0](https://openairdocs.org/service-documents/austro-engine/msb-e4-043-0.md)
- Title as filed: Austro Engine GmbH Mandatory Service Bulletin MSB-E4-0430
- Pages: 13
- PDF: https://openairdocs.org/files/sha256/08/1a/081a01ccfa529f2c35022aa85764bb440335bbef947119d00cb8cdf4cff0d2e5
- Page: https://openairdocs.org/service-documents/austro-engine/msb-e4-043-0/file/081a01ccfa52

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### Page 1

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 1-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
Distribution: Portal 
Date: 27-Aug-2024 
1. Basic information 
1.1. Subject 
Piston borescope inspection 
1.2. Record of revisions 
Rev. Date Reason 
0 27.08.2024 Initial approval 
1.3. Definitions and Acronyms 
For the purpose of this Service Bulletin, the following definitions and acronyms apply: 
AD:    Airworthiness Directive 
Diamond partners portal: partners.diamondaircraft.com 
EAD:    Emergency Airworthiness Directive 
Flight Hours (FH): Means the cumulative number of airborne hours in operation of each 
Engine computed from the time an aircraft leaves the ground until it 
touches the ground at the end of a flight. 
GTC: General Terms of Commerce 
MSB: Mandatory Service Bulletin 
n/a: Not applicable 
no.: Number 
p/n or p/ns:  Part number or Part numbers 
SB:  Service Bulletin 
s/n or s/ns:  Serial number or Serial numbers 
Time Since Installation: Time since installation of the piston 
Time Since New (TSN): Is the amount of Flight Hours elapsed since new. 
Time Since Overhaul (TSO): Is the amount of Flight Hours elapsed since the last engine overhaul. 
VMC: Visual meteorological conditions

### Page 2

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 2-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
1.4. Engines affected 
Engine affected:   E4 Series 
Engine model(s):   E4, E4P 
Serial number(s) affected:  All engines listed in Table 1,  and any engines with Piston P/N E4A-72-
400-000 installed. (Note : engines produced before 01/2023 without 
the piston P/N recorded are unaffected, if  no core or piston 
replacement or overhaul has been performed).  
o Piston or engine core replacement is not a terminating action: 
o The recurrent inspection must be continued even if the engine core  is replaced, and 
the installed core serial number is listed in Table 1. 
o The recurrent inspection must be continued even if the pistons are replaced, and the 
installed piston p/n is E4A-72-400-000. 
Table 1 
E4-A 
E4-A-00425 E4-A-06442 E4-A-06452 E4-A-06460 E4-A-06465 
E4-A-06435 E4-A-06443 E4-A-06455 E4-A-06461 E4-A-06466 
E4-A-06436 E4-A-06445 E4-A-06456 E4-A-06462 E4-A-06467 
E4-A-06437 E4-A-06448 E4-A-06458 E4-A-06463 E4-A-06468 
E4-A-06441 E4-A-06449 E4-A-06459 E4-A-06464 E4-A-06469 
E4-A-06470 & subsequent 
E4-B 
E4-B-06072 E4-B-06078 E4-B-06081 E4-B-06084 E4-B-06087 
E4-B-06076 E4-B-06079 E4-B-06082 E4-B-06085 E4-B-06088 
E4-B-06077 E4-B-06080 E4-B-06083 E4-B-06086 E4-B-06089 
E4-B-06090 & subsequent 
E4-C 
E4-C-00020 E4-C-00510 E4-C-06340 E4-C-06348 E4-C-06354 
E4-C-00085 E4-C-00681 E4-C-06341 E4-C-06349 E4-C-06355 
E4-C-00086 E4-C-06332 E4-C-06343 E4-C-06350 E4-C-06356 
E4-C-00304 E4-C-06336 E4-C-06345 E4-C-06351 E4-C-06357 
E4-C-00354 E4-C-06337 E4-C-06346 E4-C-06352 E4-C-06358 
E4-C-00400 E4-C-06339 E4-C-06347 E4-C-06353 E4-C-06359 
E4-C-06360 & subsequent 
E4P 
E4P-C-06221 & subsequent 
Engine Core s/n 
02435 02449 02462 02470 02478 02486 02507 02515 02523 02531 
02436 02450 02463 02471 02479 02489 02508 02516 02524 02555 
02439 02451 02464 02472 02480 02500 02509 02517 02525 02556 
02440 02452 02465 02473 02481 02502 02510 02518 02526 02557 
02444 02453 02466 02474 02482 02503 02511 02519 02527 02558 
02446 02459 02467 02475 02483 02504 02512 02520 02528 02559 
02447 02460 02468 02476 02484 02505 02513 02521 02529  
02448 02461 02469 02477 02485 02506 02514 02522 02530 
02560 & subsequent

### Page 3

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 3-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
1.5. Reason 
Cases of piston cracks have been identified by Austro Engine. These cracks can develop to an extent 
leading to power loss if not detected. Such cracks can be detected during the borescope inspection. 
This service Bulletin provides the necessary instructions to inspect pistons for early crack detection. 
1.6. Time of compliance 
Engine 
configuration Time since installation Initial inspection Repetitive inspection 
E4A, E4P 
< 100 FH 100 FH 50 FH ± 10 FH 
> 100 FH Before the Next Flight 50 FH ± 10 FH 
E4B, E4C 
< 200 FH 200 FH 100 FH ± 10 FH 
> 200 FH Before the Next Flight 100 FH ± 10 FH 
 
For the initial inspection, a single ferry flight without passengers, not exceeding 3 flight hours (FH)  in 
VMC condition, is permitted to reach a maintenance location where the required action can be 
performed. 
1.6.1. Credits 
Piston borescope i nspections, accomplished before the effective date of this Mandatory Service 
Bulletin in accordance with the instructions of the AR1734 , are  acceptable to comply with the 
requirements of this Mandatory Service Bulletin for that engine. 
1.6.2. Parts Installation 
From the effective date of this Mandatory Service Bulletin, installation of a piston p/n N E4A-72-400-
000 is allowed, provided recurrent borescope inspection is accomplished in accordance with the 
compliance time listed in paragraph 1.6. 
1.7. Concurrent documents / references 
Note: If not specified, the latest revision of the referenced documents applies. 
- Maintenance Manual E4 Series – Doc. No. E4.08.04, latest effective issue 
- MSB-E4-039 
- WI-MSB-E4-039-I 
- WI-MSB-E4-039-II 
1.8. Other publications affected 
None

### Page 4

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 4-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
2. Technical Details 
2.1. Accomplishment / Instructions 
1. Remove the injectors in accordance with MM section 73-10-01-A.  
o The compression test added with MM-TR-MDC-E4-849a is not required.  
 
2. Use a borescope to examine the piston top for cracks, paying particular attention to the area 
marked in red in Fig. 1. 
 
3. Report the inspection as “performed” on partners.diamondaircraft.com 
o Carefully handle the borescope to prevent any damage to the surface of the piston.  
o Refer to Appendix for borescope images. In case of doubt, contact Austro Engine.  
o In case of findings, proceed in accordance with paragraph 2.1.1. 
 
 
Fig. 1 
 
4. Re-install the injectors in accordance with MM section 73-10-01-B. 
o If leakage is found after the ground run, replace the high-pressure fuel lines. 
o The compression test added with MM-TR-MDC-E4-849a is not required.

### Page 5

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 5-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
2.1.1. Piston crack repair instructions 
1. Report the engine data at AE300data@austroengine.net. 
2. Collect a fuel sample from the HPP fuel return line. 
3. Send the fuel to a laboratory and perform a fuel analysis in accordance with ASTM D6304 and 
provide the results to partners.diamondaircraft.com 
o If water or contaminants are found: 
o Collect a fuel sample from the HPP fuel inlet line and perform a fuel analys is, provide 
the results to partners.diamondaircraft.com and 
o Replace the injectors, the HPP, the fuel rails accordance with MM sections 73 -10-01 
“Injectors”, 73-10-03 “High-Pressure Pump (HPP)”, 73 -20-02 “Fuel rail”, and replace 
the engine core in accordance with WI-MSB-E4-039-I “Core engine replacement” or 
o Replace the injectors, the HPP, the fuel rails and the pistons in accordance with MM 
sections 73-10-01 “Injectors”, 73-10-03 “High-Pressure Pump (HPP)”, 73 -20-02 “Fuel 
rail”, and work instruction WI-MSB-E4-039-II “Piston replacement”. 
NOTE: Contact the airplane TCH for further instruction in case fuel system contamination is found. 
o If water or contaminants are not found: 
o Replace the engine core  with new parts  in accordance with WI -MSB-E4-039-I “Core 
engine replacement” or 
o Replace the piston with new parts in accordance with WI -MSB-E4-039-II “Piston 
replacement”. 
2.2. Illustrations 
Provided as Appendix to this Service Bulletin 
2.3. Mass (weight) 
Not affected 
2.4. Approval statement 
The technical content of this document is approved under the authority of the DOA, ref.: EASA. 
21J.399.

### Page 6

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 6-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
3. Planning Information 
3.1. Material & availability 
 
MSB Kit Number MSB-E4043-KIT Composed by the following parts 
Part Number Description Qty 
DIN6797-6.4-A tooth washer M6 6 
E4A-03-000-201 Screw M6x79 4 
E4A-03-000-801 Sealing ring 15x1,56 Cu 4 
OR_7.8x3.2-ACM70 O-Ring 7,8x3,2 ACM70 1 
DIN7603-A10X13,5-AL Sealing ring 10x13,5 AL 2 
  
3.2. Special tools 
Refer to the MM. 
3.3. Labour effort 
5 Hours

### Page 7

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 7-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
4. Remarks 
 
 NOTE: 
 
o All measures must be carried out by a certified engine maintenance organisation and certified 
engine mechanics. 
o The accomplishment of the instructions shown under chapter 2.1 must be documented in the 
respective engine logbook. 
o The accomplishment of the instructions must be carried out within the time of compliance 
according to chapter 1.6. 
o In case of doubt, please contact Austro Engine GmbH via the Diamond Partner Portal. 
o If you are not a Diamond Partner / Service Centre, please contact a Diamond Authorized 
Service Centre near you. 
 
5. Explanatory notes 
5.1. Symbol explanation 
 
WARNING: Disregarding these safety rules can cause personal injury or even death. 
 
CAUTION: Disregarding these special instructions and safety measures can cause damage to the engine or other components. 
 NOTE: Additional note or instruction for better understanding of an instruction.

### Page 8

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 8-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
6. Appendix 
The following examples of borescope images shall assist in determining the condition of the pistons. 
 Note: In case of doubt, contact Austro Engine. 
 
 
 
 
X 
X

### Page 9

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 9-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
 
  
X 
X

### Page 10

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 10-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
 
 
 
  
X 
X

### Page 11

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 11-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
 
 
 
  
X 
X

### Page 12

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 12-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
 
 
 
  
X 
X

### Page 13

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-043/0 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
27 08 2024 -- -- -- -- 13-13 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
 
 
X

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