# Austro Engine Mandatory Service Bulletin MSB-E4-042: No revision named

- Rights: © Austro Engine. Filed by the FAA in regulations.gov docket FAA-2024-0456; AD 2024-05-01 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Austro Engine Mandatory Service Bulletin MSB-E4-042](https://openairdocs.org/service-documents/austro-engine/msb-e4-042.md)
- Title as filed: Austro Engine MSB E4-042
- Pages: 16
- PDF: https://openairdocs.org/files/sha256/60/2d/602d52d3d513a179d80f6152eea5c5750569debc42a45e4184661db2c934076b
- Page: https://openairdocs.org/service-documents/austro-engine/msb-e4-042/file/602d52d3d513

## Text

Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 1-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
Distribution: Portal 
Date: 31.01.2024 
1. Basic information 
1.1. Subject 
Crankshaft-bearing cap screws replacement 
1.2. Record of revisions 
Rev. Date Reason 
0 31.01.2024 Initial approval 
   
   
   
 
Revised portions of this Mandatory Service Bulletin are marked highlighting the revised text in yellow. 
Removed text is highlighted in grey and strikethrough example.

### Page 2

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 2-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
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. 
FH:     Flight Hours. 
Flight Hours: 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. 
TBO:    Time Between Overhaul. 
Time Between Overhaul: Is the maximum number of Flight Hours that may be logged on an 
engine before the Maintenance Manual requires the product be 
removed for overhaul or replacement. For E4 and E4P engines the 
recommended Time Between Overhaul is 1800 FH. 
TSN:    Time Since New. 
Time Since New:  Is the amount of Flight Hours elapsed since new. 
Time Since Overhaul:  Is the amount of Flight Hours elapsed since the last engine overhaul. 
VFR:    Visual flight rules

### Page 3

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 3-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
1.4. Reason 
Occurrences of E4 series engines have been reported recently. Investigation of the occurrences has 
shown in some cases the failure of one inner main bearing cap screw. Subsequent investigations have 
determined that certain batches of inner main bearing cap screws were produced at the lower end 
of the material strength tolerance for Class 8.8 screws. Depending on the magnitude of the screw’s 
strength properties, the potential for screw failure, leading to engine failure, exists in cases where 
abnormal operating conditions are experienced such as fuel  quality issues or significant deviations 
from the fuel system requirements.  To address this possible unsafe condition, this Service Bulletin 
requires the replacement of the inner main bearing cap screws, with screws having highest safety 
factor, to be completed within the timeframe specified in §1.6. 
1.5. Engines affected 
Engine affected: E4 Series 
Serial numbers affected: All E4/E4P engines listed in Table 1 and Table 2 
Table 1 - Affected Engine Serial Numbers 
E4-A 
E4-A-00228 
E4-A-00425 
E4-A-00441 
E4-A-00485 
E4-A-00549 
E4-A-05077 
E4-A-06276 
E4-A-06277 
E4-A-06279 
E4-A-06280 
E4-A-06281 
E4-A-06282 
E4-A-06283 
E4-A-06285 
E4-A-06286 
E4-A-06287 
E4-A-06289 
E4-A-06290 
E4-A-06292 
E4-A-06306 
E4-A-06310 
E4-A-06311 
E4-A-06312 
E4-A-06313 
E4-A-06314 
E4-A-06315 
E4-A-06316 
E4-A-06317 
E4-A-06318 
E4-A-06319 
E4-A-06320 
E4-A-06321 
 
E4-A-06322 
E4-A-06323 
E4-A-06324 
E4-A-06325 
E4-A-06326 
E4-A-06327 
E4-A-06328 
E4-A-06329 
E4-A-06332 
E4-A-06333 
E4-A-06340 
E4-A-06341 
E4-A-06343 
E4-A-06349 
E4-A-06353 
E4-A-06354 
E4-A-06359 
E4-A-06360 
E4-A-06361 
E4-A-06362 
E4-A-06366 
E4-A-06367 
E4-A-06368 
E4-A-06370 
E4-A-06371 
E4-A-06372 
E4-A-06373 
E4-A-06374 
E4-A-06375 
E4-A-06376 
E4-A-06378 
E4-A-06379 
 
E4-A-06383 
E4-A-06384 
E4-A-06385 
E4-A-06386 
E4-A-06387 
E4-A-06388 
E4-A-06389 
E4-A-06390 
E4-A-06391 
E4-A-06392 
E4-A-06393 
E4-A-06394 
E4-A-06397 
E4-A-06398 
E4-A-06400 
E4-A-06401 
E4-A-06402 
E4-A-06403 
E4-A-06404 
E4-A-06405 
E4-A-06406 
E4-A-06407 
E4-A-06408 
E4-A-06409 
E4-A-06410 
E4-A-06413 
E4-A-06414 
E4-A-06424 
E4-A-06425 
E4-A-06435 
E4-A-06441 
E4-A-06442 
 
E4-A-06448 
E4-A-06452 
E4-A-06458 
E4-A-06459 
E4-A-06460 
E4-A-06461 
E4-A-06462 
E4-A-06463 
E4-A-06464 
E4-A-06468 
E4-A-06469 
E4-A-06470 
E4-A-06471 
E4-A-06472 
E4-A-06473 
E4-A-06474 
E4-A-06475 
E4-A-06476 
E4-A-06477 
E4-A-06478 
E4-A-06479 
E4-A-06480 
E4-A-06481 
E4-A-06482 
E4-A-06483 
E4-A-06484 
E4-A-06485 
E4-A-06486 
E4-A-06487 
E4-A-06488 
E4-A-06489 
E4-A-06490 
 
E4-A-06491 
E4-A-06492 
E4-A-06493 
E4-A-06494 
E4-A-06499 
E4-A-06500 
E4-A-06502 
E4-A-06504 
E4-A-06506 
E4-A-06507 
E4-A-06508 
E4-A-06509 
E4-A-06510 
E4-A-06511 
E4-A-06512 
E4-A-06513 
E4-A-06515 
E4-A-06516 
E4-A-06517 
E4-A-06519 
E4-A-06521 
E4-A-06522 
E4-A-06523 
E4-A-06525 
E4-A-06526 
E4-A-06527 
E4-A-06528 
E4-A-06531 
E4-A-06533 
E4-A-06534 
E4-A-06535 
E4-A-06536

### Page 4

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 4-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
E4-A-06537 
E4-A-06539 
E4-A-06540 
E4-A-06541 
E4-A-06542 
E4-A-06543 
E4-A-06544 
E4-A-06545 
E4-A-06546 
E4-A-06549 
E4-A-06555 
E4-A-06556 
E4-A-06557 
E4-A-06558 
E4-A-06561 
E4-A-06562 
E4-A-06564 
E4-A-06565 
E4-A-06566 
E4-A-06567 
E4-A-06568 
E4-A-06570 
E4-A-06574 
E4-A-06577 
E4-A-06579 
E4-A-06580 
E4-A-06581 
E4-A-06583 
E4-A-06584 
E4-A-06586 
E4-A-06591 
E4-A-06594 
E4-A-06595 
E4-A-06596 
E4-A-06597 
E4-A-06598 
E4-A-06600 
E4-A-06601 
E4-A-06602 
 
E4-A-06604 
E4-A-06605 
E4-A-06606 
E4-A-06607 
E4-A-06608 
E4-A-06609 
E4-A-06610 
E4-A-06611 
E4-A-06612 
E4-A-06613 
E4-A-06614 
E4-A-06616 
E4-A-06621 
E4-A-06622 
E4-A-06623 
E4-A-06626 
E4-A-06628 
E4-A-06637 
E4-A-06639 
E4-A-06644 
E4-A-06648 
E4-A-06667 
E4-A-06670 
E4-A-06671 
E4-A-06693 
E4-A-06694 
E4-A-06697 
E4-A-06700 
E4-A-06701 
E4-A-06703 
E4-A-06710 
E4-A-06711 
E4-A-06712 
E4-A-06713 
E4-A-06714 
E4-A-06715 
E4-A-06716 
E4-A-06717 
E4-A-06718 
E4-A-06719 
E4-A-06720 
E4-A-06721 
E4-A-06722 
E4-A-06723 
E4-A-06724 
E4-A-06725 
E4-A-06727 
E4-A-06729 
E4-A-06730 
E4-A-06731 
E4-A-06732 
E4-A-06733 
E4-A-06734 
E4-A-06735 
E4-A-06736 
E4-A-06737 
E4-A-06738 
E4-A-06739 
E4-A-06741 
E4-A-06742 
E4-A-06743 
E4-A-06744 
E4-A-06745 
E4-A-06746 
E4-A-06747 
E4-A-06748 
E4-A-06749 
E4-A-06750 
E4-A-06751 
E4-A-06752 
E4-A-06753 
E4-A-06754 
E4-A-06755 
E4-A-06756 
E4-A-06757 
E4-A-06758 
E4-A-06759 
E4-A-06760 
E4-A-06761 
E4-A-06762 
E4-A-06763 
E4-A-06764 
E4-A-06765 
E4-A-06766 
E4-A-06767 
E4-A-06768 
E4-A-06769 
E4-A-06770 
E4-A-06771 
E4-A-06772 
E4-A-06773 
E4-A-06774 
E4-A-06775 
E4-A-06776 
E4-A-06777 
E4-A-06778 
E4-A-06779 
E4-A-06780 
E4-A-06781 
E4-A-06782 
E4-A-06783 
E4-A-06784 
E4-A-06785 
E4-A-06786 
E4-A-06787 
E4-A-06788 
E4-A-06789 
E4-A-06790 
E4-A-06791 
E4-A-06792 
E4-A-06793 
E4-A-06794 
E4-A-06795 
E4-A-06796 
E4-A-06797 
E4-A-06798 
E4-A-06799 
E4-A-06800 
E4-A-06801 
E4-A-06802 
E4-A-06803 
E4-A-06804 
E4-B 
E4-B-06038 
E4-B-06040 
E4-B-06041 
E4-B-06046 
E4-B-06047 
E4-B-06048 
E4-B-06050 
E4-B-06051 
E4-B-06052 
E4-B-06053 
E4-B-06057 
E4-B-06058 
E4-B-06059 
E4-B-06060 
E4-B-06061 
E4-B-06062 
E4-B-06063 
E4-B-06064 
E4-B-06065 
E4-B-06066 
E4-B-06069 
E4-B-06070 
E4-B-06072 
E4-B-06076 
E4-B-06077 
E4-B-06078 
E4-B-06079 
E4-B-06080 
E4-B-06081 
E4-B-06083 
E4-B-06084 
E4-B-06085 
E4-B-06086 
E4-B-06088 
E4-B-06089 
E4-B-06091 
E4-B-06092 
E4-B-06094 
E4-B-06096 
E4-B-06097 
E4-B-06098 
E4-B-06099 
E4-B-06100 
E4-B-06101 
E4-B-06103 
E4-B-06104 
E4-B-06105 
E4-B-06106 
E4-B-06108 
E4-B-06109

### Page 5

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 5-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
E4-B-06111 
E4-B-06112 
E4-B-06121 
E4-B-06123 
E4-B-06125 
E4-B-06127 
E4-B-06128 
E4-B-06129 
E4-B-06130 
E4-B-06131 
E4-B-06132 
E4-B-06133 
E4-B-06134 
E4-B-06135 
E4-B-06136 
E4-B-06137 
E4-B-06138 
E4-B-06139 
E4-B-06140 
E4-B-06141 
E4-B-06142 
  
E4C 
E4-C-00018 
E4-C-00020 
E4-C-00038 
E4-C-00039 
E4-C-00041 
E4-C-00059 
E4-C-00085 
E4-C-00086 
E4-C-00212 
E4-C-00262 
E4-C-00304 
E4-C-00307 
E4-C-00314 
E4-C-00400 
E4-C-00510 
E4-C-05125 
E4-C-05126 
E4-C-06207 
E4-C-06218 
E4-C-06219 
E4-C-06224 
E4-C-06225 
E4-C-06227 
E4-C-06231 
E4-C-06237 
E4-C-06238 
E4-C-06243 
E4-C-06244 
E4-C-06245 
E4-C-06246 
E4-C-06248 
E4-C-06249 
E4-C-06250 
E4-C-06251 
E4-C-06252 
E4-C-06253 
E4-C-06260 
E4-C-06264 
E4-C-06269 
E4-C-06270 
E4-C-06273 
E4-C-06280 
E4-C-06281 
E4-C-06283 
E4-C-06284 
E4-C-06285 
E4-C-06286 
E4-C-06287 
E4-C-06288 
E4-C-06289 
E4-C-06290 
E4-C-06291 
E4-C-06292 
E4-C-06293 
E4-C-06296 
E4-C-06297 
E4-C-06298 
E4-C-06299 
E4-C-06300 
E4-C-06304 
E4-C-06305 
E4-C-06306 
E4-C-06307 
E4-C-06311 
E4-C-06313 
E4-C-06320 
E4-C-06332 
E4-C-06333 
E4-C-06336 
E4-C-06337 
E4-C-06339 
E4-C-06340 
E4-C-06343 
E4-C-06345 
E4-C-06346 
E4-C-06347 
E4-C-06348 
E4-C-06349 
E4-C-06350 
E4-C-06351 
E4-C-06352 
E4-C-06353 
E4-C-06354 
E4-C-06355 
E4-C-06356 
E4-C-06357 
E4-C-06358 
E4-C-06359 
E4-C-06360 
E4-C-06362 
E4-C-06363 
E4-C-06364 
E4-C-06365 
E4-C-06366 
E4-C-06367 
E4-C-06368 
E4-C-06369 
E4-C-06371 
E4-C-06372 
E4-C-06373 
E4-C-06374 
E4-C-06375 
E4-C-06376 
E4-C-06377 
E4-C-06379 
E4-C-06380 
E4-C-06381 
E4-C-06383 
E4-C-06384 
E4-C-06386 
E4-C-06387 
E4-C-06388 
E4-C-06389 
E4-C-06390 
E4-C-06391 
E4-C-06392 
E4-C-06395 
E4-C-06396 
E4-C-06397 
E4-C-06398 
E4-C-06400 
E4-C-06403 
E4-C-06404 
E4-C-06405 
E4-C-06406 
E4-C-06407 
E4-C-06408 
E4-C-06409 
E4-C-06410 
E4-C-06411 
E4-C-06413 
E4-C-06415 
E4-C-06417 
E4-C-06419 
E4-C-06420 
E4-C-06420 
E4-C-06421 
E4-C-06423 
E4-C-06424 
E4-C-06431 
E4-C-06432 
E4-C-06438 
E4-C-06439 
E4-C-06440 
E4-C-06441 
E4-C-06443 
E4-C-06444 
E4-C-06445 
E4-C-06447 
E4-C-06449 
E4-C-06452 
E4-C-06453 
E4-C-06454 
E4-C-06458 
E4-C-06459 
E4-C-06460 
E4-C-06461 
E4-C-06463 
E4-C-06464 
E4-C-06465 
E4-C-06466 
E4-C-06467 
E4-C-06468 
E4-C-06472 
E4-C-06473 
E4-C-06474 
E4-C-06475 
E4-C-06476 
E4-C-06477 
E4-C-06478 
E4-C-06479 
E4-C-06481 
E4-C-06482 
E4-C-06483 
E4-C-06484 
E4-C-06485 
E4-C-06486 
E4-C-06487 
E4-C-06494 
E4-C-06495 
E4-C-06496 
E4-C-06497 
E4-C-06498 
E4-C-06500 
E4-C-06501 
E4-C-06503 
E4-C-06504 
E4-C-06505 
E4-C-06507 
E4-C-06508 
E4-C-06509 
E4-C-06510 
E4-C-06512 
E4-C-06515 
E4-C-06519 
E4-C-06534 
E4-C-06535 
E4-C-06536 
E4-C-06537 
E4-C-06538 
E4-C-06539 
E4-C-06541 
E4-C-06542 
E4-C-06543 
E4-C-06545 
E4-C-06548 
E4-C-06551 
E4-C-06562 
E4-C-06563 
E4-C-06564

### Page 6

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 6-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
E4-C-06565 
E4-C-06566 
E4-C-06567 
E4-C-06568 
E4-C-06569 
E4-C-06573 
E4-C-06575 
E4-C-06576 
E4-C-06577 
E4-C-06578 
E4-C-06579 
E4-C-06580 
E4-C-06583 
E4-C-06584 
E4-C-06585 
E4-C-06586 
E4-C-06587 
E4-C-06588 
E4-C-06589 
E4-C-06590 
E4-C-06591 
E4-C-06592 
E4-C-06593 
E4-C-06594 
E4-C-06595 
E4-C-06596 
E4-C-06597 
E4-C-06598 
E4-C-06599 
E4-C-06600 
E4-C-06601 
E4-C-06602 
E4-C-06603 
E4-C-06604 
E4-C-06605 
E4-C-06606 
E4-C-06607 
E4-C-06608 
E4-C-06611 
E4-C-06612 
E4-C-06613 
E4-C-06614 
E4-C-06615 
E4-C-06616 
E4-C-06617 
E4-C-06618 
E4-C-06619 
E4-C-06620 
E4-C-06621 
E4-C-06622 
E4-C-06623 
E4-C-06624 
E4-C-06625 
E4-C-06626 
E4-C-06627 
E4-C-06628 
E4-C-06629 
E4-C-06630 
E4-C-06631 
E4-C-06632 
E4-C-06633 
E4-C-06634 
E4-C-06635 
E4-C-06636 
E4-C-06637 
E4-C-06638 
E4-C-06639 
E4-C-06640 
E4-C-06641 
E4-C-06642 
E4-C-06643 
E4-C-06644 
E4-C-06645 
E4-C-06646 
E4-C-06647 
 
  
E4P 
E4P-C-06065 
E4P-C-06143 
E4P-C-06145 
E4P-C-06146 
E4P-C-06148 
E4P-C-06150 
E4P-C-06151 
E4P-C-06156 
E4P-C-06167 
E4P-C-06168 
E4P-C-06169 
E4P-C-06170 
E4P-C-06177 
E4P-C-06183 
E4P-C-06186 
E4P-C-06187 
E4P-C-06188 
E4P-C-06189 
E4P-C-06190 
E4P-C-06191 
E4P-C-06192 
E4P-C-06193 
E4P-C-06194 
E4P-C-06195 
E4P-C-06196 
E4P-C-06197 
E4P-C-06198 
E4P-C-06199 
E4P-C-06200 
E4P-C-06201 
E4P-C-06202 
E4P-C-06203 
E4P-C-06204 
E4P-C-06205 
E4P-C-06206 
E4P-C-06207 
E4P-C-06208 
E4P-C-06215 
E4P-C-06221 
E4P-C-06222 
E4P-C-06223 
E4P-C-06226 
E4P-C-06228 
E4P-C-06230 
E4P-C-06234 
E4P-C-06236 
E4P-C-06237 
E4P-C-06238 
E4P-C-06239 
E4P-C-06241 
E4P-C-06243 
E4P-C-06244 
E4P-C-06245 
E4P-C-06246 
E4P-C-06247 
E4P-C-06248 
E4P-C-06249 
E4P-C-06250 
E4P-C-06251 
E4P-C-06252 
E4P-C-06253 
E4P-C-06254 
E4P-C-06256 
E4P-C-06257 
E4P-C-06260 
E4P-C-06261 
E4P-C-06262 
E4P-C-06263 
E4P-C-06264 
E4P-C-06265 
E4P-C-06266 
E4P-C-06268 
E4P-C-06270 
E4P-C-06272 
E4P-C-06277 
E4P-C-06278 
E4P-C-06279 
E4P-C-06281 
E4P-C-06282 
E4P-C-06283 
E4P-C-06284 
E4P-C-06286 
E4P-C-06287 
E4P-C-06292 
E4P-C-06293 
E4P-C-06298 
E4P-C-06299 
E4P-C-06301 
E4P-C-06302 
E4P-C-06303

### Page 7

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 7-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
E4P-C-06304 
E4P-C-06305 
E4P-C-06306 
E4P-C-06307 
E4P-C-06308 
E4P-C-06310 
E4P-C-06311 
E4P-C-06312 
E4P-C-06315 
E4P-C-06319 
E4P-C-06323 
E4P-C-06326 
E4P-C-06328 
E4P-C-06330 
E4P-C-06331 
E4P-C-06342 
E4P-C-06344 
E4P-C-06353 
E4P-C-06354 
E4P-C-06359 
E4P-C-06360 
E4P-C-06361 
E4P-C-06362 
E4P-C-06363 
E4P-C-06364 
E4P-C-06365 
E4P-C-06366 
E4P-C-06367 
E4P-C-06368 
E4P-C-06369 
E4P-C-06370 
E4P-C-06371 
E4P-C-06373 
E4P-C-06376 
E4P-C-06377 
E4P-C-06378 
E4P-C-06379 
E4P-C-06380 
E4P-C-06381 
E4P-C-06382 
E4P-C-06383 
E4P-C-06384 
E4P-C-06385 
E4P-C-06386 
E4P-C-06387 
E4P-C-06388 
E4P-C-06389 
E4P-C-06390 
E4P-C-06391 
E4P-C-06392 
E4P-C-06393 
E4P-C-06394 
E4P-C-06395 
E4P-C-06396 
E4P-C-06397 
E4P-C-06398 
E4P-C-06399 
E4P-C-06400 
E4P-C-06401 
E4P-C-06402 
E4P-C-06403 
E4P-C-06404 
 
Engine Core s/n 
00206 
01941 
02175 
02176 
02177 
02178 
02179 
02180 
02181 
02182 
02195 
02197 
02198 
02199 
02200 
02205 
02206 
02207 
02208 
02209 
02210 
02211 
02212 
02213 
02214 
02225 
02226 
02227 
02228 
02229 
02230 
02231 
02232 
02233 
02234 
02235 
02236 
02237 
02238 
02239 
02240 
02241 
02242 
02243 
02244 
02245 
02246 
02247 
02248 
02249 
02250 
02251 
02252 
02253 
02259 
02260 
02261 
02262 
02263 
02264 
02265 
02266 
02267 
02268 
02279 
02280 
02281 
02288 
02308 
02319 
02321 
02323 
02325 
02328 
02340 
02358 
02367 
02379 
02381 
02382 
02383 
02408 
02628 
02656 
02893 
02914 
02917 
02933 
03179 
03183 
03188 
03192 
03271 
03294 
03313 
03343 
03367 
03411 
03413

### Page 8

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 8-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
Table 2 - Affected Engine Serial Numbers 
E4-A 
E4-A-06134 
E4-A-06138 
E4-A-06149 
E4-A-06180 
E4-A-06216 
E4-A-06218 
E4-A-06219 
E4-A-06222 
E4-A-06223 
E4-A-06225 
E4-A-06226 
E4-A-06227 
E4-A-06233 
E4-A-06239 
E4-A-06242 
E4-A-06246 
E4-A-06300 
E4-A-06302 
E4-A-06303 
E4-A-06304 
E4-A-06307 
E4-A-06308 
E4-A-06334 
E4-A-06338 
E4-A-06347 
E4-A-06350 
E4-A-06351 
E4-A-06352 
E4-A-06357 
E4-A-06369 
E4-A-06395 
E4-A-06399 
E4-A-06411 
E4-A-06412 
E4-A-06415 
E4-A-06416 
E4-A-06417 
E4-A-06418 
E4-A-06419 
E4-A-06420 
E4-A-06421 
E4-A-06422 
E4-A-06423 
E4-A-06426 
E4-A-06427 
E4-A-06428 
E4-A-06429 
E4-A-06430 
E4-A-06431 
E4-A-06432 
E4-A-06433 
E4-A-06434 
E4-A-06438 
E4-A-06439 
E4-A-06440 
E4-A-06444 
E4-A-06446 
E4-A-06447 
E4-A-06450 
E4-A-06451 
E4-A-06453 
E4-A-06454 
E4-A-06455 
E4-A-06456 
E4-A-06457 
E4-A-06465 
E4-A-06466 
E4-A-06467 
E4-A-06495 
E4-A-06496 
E4-A-06497 
E4-A-06498 
E4-A-06501 
E4-A-06503 
E4-A-06505 
E4-A-06514 
E4-A-06518 
E4-A-06520 
E4-A-06524 
E4-A-06529 
E4-A-06530 
E4-A-06532 
E4-A-06538 
E4-A-06547 
E4-A-06548 
E4-A-06550 
E4-A-06551 
E4-A-06552 
E4-A-06553 
E4-A-06554 
E4-A-06559 
E4-A-06560 
E4-A-06563 
E4-A-06569 
E4-A-06571 
E4-A-06572 
E4-A-06573 
E4-A-06575 
E4-A-06576 
E4-A-06578 
E4-A-06582 
E4-A-06585 
E4-A-06587 
E4-A-06588 
E4-A-06589 
E4-A-06590 
E4-A-06592 
E4-A-06593 
E4-A-06599 
E4-A-06615 
E4-A-06617 
E4-A-06618 
E4-A-06619 
E4-A-06620 
E4-A-06624 
E4-A-06625 
E4-A-06627 
E4-A-06629 
E4-A-06630 
E4-A-06631 
E4-A-06632 
E4-A-06633 
E4-A-06634 
E4-A-06635 
E4-A-06636 
E4-A-06638 
E4-A-06640 
E4-A-06641 
E4-A-06642 
E4-A-06643 
E4-A-06645 
E4-A-06646 
E4-A-06647 
E4-A-06649 
E4-A-06650 
E4-A-06651 
E4-A-06652 
E4-A-06653 
E4-A-06654 
E4-A-06655 
E4-A-06656 
E4-A-06657 
E4-A-06658 
E4-A-06659 
E4-A-06660 
E4-A-06661 
E4-A-06662 
E4-A-06663 
E4-A-06664 
E4-A-06665 
E4-A-06666 
E4-A-06668 
E4-A-06669 
E4-A-06672 
E4-A-06673 
E4-A-06674 
E4-A-06675 
E4-A-06676 
E4-A-06677 
E4-A-06678 
E4-A-06679 
E4-A-06680 
E4-A-06681 
E4-A-06682 
E4-A-06683 
E4-A-06684 
E4-A-06685 
E4-A-06686 
E4-A-06687 
E4-A-06688 
E4-A-06689 
E4-A-06690 
E4-A-06691 
E4-A-06692 
E4-A-06695 
E4-A-06696 
E4-A-06698 
E4-A-06699 
E4-A-06702 
E4-A-06704 
E4-A-06705 
E4-A-06706 
E4-A-06707 
E4-A-06708 
E4-A-06709

### Page 9

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 9-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
E4-B 
E4-B-06027 
E4-B-06028 
E4-B-06029 
E4-B-06044 
E4-B-06045 
E4-B-06067 
E4-B-06068 
E4-B-06071 
E4-B-06073 
E4-B-06074 
E4-B-06075 
E4-B-06082 
E4-B-06087 
E4-B-06090 
E4-B-06093 
E4-B-06095 
E4-B-06102 
E4-B-06107 
E4-B-06110 
E4-B-06113 
E4-B-06114 
E4-B-06115 
E4-B-06116 
E4-B-06117 
E4-B-06118 
E4-B-06119 
E4-B-06120 
E4-B-06122 
E4-B-06124 
E4-B-06126 
  
E4-C 
E4-C-00267 
E4-C-00354 
E4-C-00406 
E4-C-00681 
E4-C-06191 
E4-C-06196 
E4-C-06201 
E4-C-06205 
E4-C-06239 
E4-C-06241 
E4-C-06254 
E4-C-06256 
E4-C-06257 
E4-C-06265 
E4-C-06266 
E4-C-06275 
E4-C-06276 
E4-C-06282 
E4-C-06294 
E4-C-06295 
E4-C-06301 
E4-C-06302 
E4-C-06303 
E4-C-06308 
E4-C-06309 
E4-C-06310 
E4-C-06312 
E4-C-06314 
E4-C-06315 
E4-C-06316 
E4-C-06317 
E4-C-06318 
E4-C-06319 
E4-C-06321 
E4-C-06322 
E4-C-06323 
E4-C-06324 
E4-C-06325 
E4-C-06326 
E4-C-06327 
E4-C-06328 
E4-C-06329 
E4-C-06330 
E4-C-06331 
E4-C-06334 
E4-C-06335 
E4-C-06338 
E4-C-06342 
E4-C-06344 
E4-C-06361 
E4-C-06378 
E4-C-06382 
E4-C-06385 
E4-C-06393 
E4-C-06394 
E4-C-06399 
E4-C-06401 
E4-C-06402 
E4-C-06412 
E4-C-06414 
E4-C-06416 
E4-C-06418 
E4-C-06422 
E4-C-06425 
E4-C-06426 
E4-C-06427 
E4-C-06428 
E4-C-06429 
E4-C-06430 
E4-C-06433 
E4-C-06434 
E4-C-06435 
E4-C-06436 
E4-C-06437 
E4-C-06442 
E4-C-06446 
E4-C-06448 
E4-C-06450 
E4-C-06451 
E4-C-06455 
E4-C-06456 
E4-C-06457 
E4-C-06462 
E4-C-06469 
E4-C-06470 
E4-C-06471 
E4-C-06480 
E4-C-06488 
E4-C-06489 
E4-C-06490 
E4-C-06491 
E4-C-06492 
E4-C-06493 
E4-C-06499 
E4-C-06502 
E4-C-06506 
E4-C-06511 
E4-C-06513 
E4-C-06514 
E4-C-06516 
E4-C-06517 
E4-C-06518 
E4-C-06520 
E4-C-06521 
E4-C-06522 
E4-C-06523 
E4-C-06524 
E4-C-06525 
E4-C-06526 
E4-C-06527 
E4-C-06528 
E4-C-06529 
E4-C-06530 
E4-C-06531 
E4-C-06532 
E4-C-06533 
E4-C-06540 
E4-C-06544 
E4-C-06546 
E4-C-06547 
E4-C-06549 
E4-C-06550 
E4-C-06552 
E4-C-06553 
E4-C-06554 
E4-C-06555 
E4-C-06556 
E4-C-06557 
E4-C-06558 
E4-C-06559 
E4-C-06560 
E4-C-06561

### Page 10

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 10-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
E4P 
E4P-C-06118 
E4P-C-06119 
E4P-C-06124 
E4P-C-06127 
E4P-C-06129 
E4P-C-06132 
E4P-C-06155 
E4P-C-06159 
E4P-C-06160 
E4P-C-06161 
E4P-C-06165 
E4P-C-06166 
E4P-C-06173 
E4P-C-06178 
E4P-C-06184 
E4P-C-06209 
E4P-C-06210 
E4P-C-06211 
E4P-C-06212 
E4P-C-06213 
E4P-C-06216 
E4P-C-06217 
E4P-C-06218 
E4P-C-06219 
E4P-C-06220 
E4P-C-06224 
E4P-C-06227 
E4P-C-06229 
E4P-C-06255 
E4P-C-06258 
E4P-C-06267 
E4P-C-06271 
E4P-C-06273 
E4P-C-06274 
E4P-C-06275 
E4P-C-06276 
E4P-C-06280 
E4P-C-06285 
E4P-C-06288 
E4P-C-06289 
E4P-C-06290 
E4P-C-06291 
E4P-C-06294 
E4P-C-06295 
E4P-C-06296 
E4P-C-06297 
E4P-C-06300 
E4P-C-06309 
E4P-C-06313 
E4P-C-06314 
E4P-C-06316 
E4P-C-06317 
E4P-C-06318 
E4P-C-06320 
E4P-C-06321 
E4P-C-06322 
E4P-C-06324 
E4P-C-06325 
E4P-C-06327 
E4P-C-06329 
E4P-C-06332 
E4P-C-06333 
E4P-C-06334 
E4P-C-06335 
E4P-C-06336 
E4P-C-06337 
E4P-C-06338 
E4P-C-06339 
E4P-C-06340 
E4P-C-06341 
E4P-C-06343 
E4P-C-06345 
E4P-C-06346 
E4P-C-06347 
E4P-C-06348 
E4P-C-06349 
E4P-C-06350 
E4P-C-06351 
E4P-C-06352 
E4P-C-06355 
E4P-C-06356 
E4P-C-06357 
E4P-C-06358 
E4P-C-06372 
Engine core s/n 
02327 
02421 
02282 
02286 
02287 
02402 
02304 
02284 
02283 
02299 
02339 
02300 
02307 
02320 
02301 
02306 
02363 
02305 
02285 
02303 
02359 
02302 
02345 
02344 
02324 
02326 
02342 
02322 
02387 
02343 
02341 
02361 
02347 
02385 
02360 
02362 
02364 
02346 
02366 
02400 
02405 
02380 
02365 
02542 
02407 
02406 
02399 
02420 
02535 
02540 
02404 
02386 
02384 
02368 
02388 
02403 
02401 
02419 
02533 
02532 
02552 
02536 
02541 
02548 
02539 
02543 
02422 
02538 
02423 
02534 
02551 
02549 
02537 
02424 
02428 
02545 
02553 
02554 
02427 
02544 
02546 
02426 
02547 
02550 
02425 
02993 
02992

### Page 11

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 11-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
1.6. Required Actions and Time of Compliance 
GROUP “1” ENGINES 
ALL the s/n listed in 
Table 1 
Replace the inner main bearing cap 
screws, position (3) (4) (5) (6) (7) (8) 
of figure 1 
Measures must be accomplished 
immediately. 
 
A single ferry flight to the next maintenance 
station to meet the requirements of this service 
bulletin is allowed. The maximum flight duration 
is 3 hours and is limited to VFR-Day condition. 
 
GROUP “2” ENGINES 
ALL the s/n listed in 
Table 2 
Replace the inner main bearing cap 
screws, position (3) (4) (5) (6) (7) (8) 
of figure 1 
Before accumulating 300 Flight Hours or 
with the next scheduled maintenance 
action, whichever occurs first (1) 
 
 
 
(1) Time of compliance for Engines where an Overhaul was accomplished:  
  
The FH specified in §1.6 of this MSB are those accumulated by the engine since first installation 
on an aeroplane, or since last overhaul: 
e.g., For an engine which was overhauled at 1800FH, the required replacement actions must 
be accomplished before accumulating 2100FH (300FH since overhaul) 
 
 
Figure 1 – Main bearing cap screws to be replaced. 
 
  
3 5 7 
4 6 8

### Page 12

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 12-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
1.7. Concurrent documents / references 
  Note: If not specified, the latest revision of the referenced documents applies. 
• Work instruction WI-MSB-E4-042 
1.8. Other publications affected 
None 
1.9. Credits 
None

### Page 13

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 13-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
2. Technical Details 
 
Main bearing cap screw replacement 
• Perform the replacement of the main bearing cap screws in accordance with the instruction 
provided in the work instruction no. WI-MSB-E4-042 rev. 0 or latest approved revision. 
• Mark the service bulletin as executed on the Diamond partners portal

### Page 14

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 14-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
2.1. Illustrations 
None 
2.2. Mass (weight) 
Not affected 
2.3. Approval statement 
The technical content of this document is approved under the authority of the DOA ref. EASA. 
21J.399. 
3. Planning Information 
3.1. Material & Special tools 
The list of materials and special tools is provided in the WI-MSB-E4-042, latest applicable revision. 
 
3.2. Labour effort 
8 hours for main bearing cap screws replacement according to WI-MSB-E4-042 
 
4. Warranty 
Costs for labour and parts related to the applicability of this MSB will be covered by Austro Engine 
GmbH warranty under the limitations outlined in paragraph 3.2 and within the currently valid GTC.  
For engine units affected by this MSB and approaching end TBO/TBR deadline pro-rated solutions 
may be offered on a case-by-case basis.  
Diamond and Austro Engine GmbH GTCs are available at https://www.diamondaircraft.com/en/GTC

### Page 15

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 15-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
5. Remarks 
 
 NOTE: 
 
o All measures must be carried out by a certified engine station and certified engine 
mechanics. 
o The accomplishment of the instructions shown under chapter 2 must be confirmed 
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/Austro 
Engine Authorized Service Centre near you. 
 
6. Explanatory notes 
6.1. 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 16

DOA no. EASA.21J.399 
Mandatory Service Bulletin 
No. MSB-E4-042 
Austro Engine GmbH 
Rudolf-Diesel-Strasse 11 
A-2700 Wiener Neustadt 
Tel: +43 2622 23000 
 
First Issue Date  Rev. No. Revision Date   Page 
31 01 2024 0 -- -- ---- 16-16 
© 2024 by Austro Engine GmbH – AUSTRIA – www.austroengine.at 
7. Appendix I 
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