# Leonardo Alert Service Bulletin 139-609

Copy: Revision A ("Leonardo Helicopters ASB 139-609 Rev A"), 29 pages: PDF https://openairdocs.org/files/sha256/1b/c6/1bc6a0f8dcffca4534c8cd60c8eb401155612547ad8b349319f8905b576b924c; text https://openairdocs.org/service-documents/leonardo/sb-139-609/file/1bc6a0f8dcff.md. Rights: © Leonardo S.p.A. Filed by the FAA in regulations.gov docket FAA-2021-0579; AD 2021-20-10 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Leonardo](https://openairdocs.org/service-documents/leonardo.md)
- Type: Service bulletin (Alert Service Bulletin)
- Number: 139-609
- Latest revision known: 139-609, Revision A, dated April 13, 2021 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/leonardo/sb-139-609

## ADs that cite it (2) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2022-27-03](https://openairdocs.org/ad/2022-27-03.md), effective Jan 31, 2023: Revision A
- [AD 2021-20-10](https://openairdocs.org/ad/2021-20-10.md), effective Nov 22, 2021: Revision A

Also cited in [2 proposed ADs](https://openairdocs.org/service-documents/leonardo/sb-139-609/proposed.md).

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