# Boeing Alert Requirements Bulletin 747-21A2577 RB

## Copies (4)

Copies the FAA filed in AD dockets on regulations.gov, newest revision first. A newer revision may exist.

- Revision 2 ("747-21A2577 RB_R2"), 25 pages: PDF https://openairdocs.org/files/sha256/04/2e/042e38fe5102103bc4e918f2061412c346f82e66a57e2109497f5c841a71236c; text https://openairdocs.org/service-documents/boeing/747-21a2577-rb/file/042e38fe5102.md. Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2022-1058; AD 2023-03-15 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Revision 2 ("747-21A2577 RB_R2"), 25 pages: PDF https://openairdocs.org/files/sha256/ac/7a/ac7ab8a6677ab657dfb4fbc7519c4e5448e44d6ff9dc20d726bde3860ae374f9; text https://openairdocs.org/service-documents/boeing/747-21a2577-rb/file/ac7ab8a6677a.md. Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2022-1058; AD 2023-03-15 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Revision 1 ("747-21A2577 RB_R1"), 22 pages: PDF https://openairdocs.org/files/sha256/ce/a5/cea52687aff651c4f43a796f87a6a791d60cfd885be49924aa0e8fb187ba623b; text https://openairdocs.org/service-documents/boeing/747-21a2577-rb/file/cea52687aff6.md. Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2022-1058; AD 2023-03-15 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- 747-21A2577 RB-00-- ("747-21A2577 RB-00--"), 33 pages: PDF https://openairdocs.org/files/sha256/bf/6e/bf6eef5a41994f60c4e3643fa1a6506107c917a6055fd313cdd45a6a7c35f588; text https://openairdocs.org/service-documents/boeing/747-21a2577-rb/file/bf6eef5a4199.md. Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2020-0848; AD 2021-07-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Boeing](https://openairdocs.org/service-documents/boeing.md)
- Type: Service bulletin (Alert Requirements Bulletin)
- Number: 747-21A2577 RB
- Latest revision known: 747-21A2577 RB, Revision 2, dated February 10, 2023 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/boeing/747-21a2577-rb

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

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

- [AD 2023-03-15](https://openairdocs.org/ad/2023-03-15.md), effective Apr 14, 2023: Revisions 1 and 2
- [AD 2021-07-09](https://openairdocs.org/ad/2021-07-09.md), effective May 12, 2021: No revision named

Also cited in [2 proposed ADs](https://openairdocs.org/service-documents/boeing/747-21a2577-rb/proposed.md).

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