# Lycoming Mandatory Service Bulletin 393

Copy: Revision C ("U.S. DOT/FAA - Service Bulletin 393C"), 3 pages: PDF https://openairdocs.org/files/sha256/27/19/2719fdb3c0976c4f9d5ffc4eb5a4a7f188b03051fe2fe5a57b23f01214abca07; text https://openairdocs.org/service-documents/lycoming/sb-393/file/2719fdb3c097.md. Rights: © Avco Corporation. Filed by the FAA in regulations.gov docket FAA-2014-0437; AD 2014-23-03 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Lycoming](https://openairdocs.org/service-documents/lycoming.md)
- Type: Service bulletin (Mandatory Service Bulletin)
- Number: 393
- Latest revision known: 393C, dated November 26, 1976 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/lycoming/sb-393

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

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

- [AD 2014-23-03](https://openairdocs.org/ad/2014-23-03.md), effective Dec 18, 2014: Revision C
- [AD 76-06-09](https://openairdocs.org/ad/76-06-09.md), effective Oct 31, 1978: Revision A

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/lycoming/sb-393/proposed.md).

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.