# Proposed AD FAA-2022-1647: Transport and Commuter Category Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-10-02
- Products: Boeing
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 11, 2023, 88 FR 1520
- Comments due: February 10, 2023
- Became: [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02)
- Docket: FAA-2022-1647 (https://www.regulations.gov/docket/FAA-2022-1647, where comments are filed)
- Project: AD-2022-01379-T
- FR document: 2023-00420
- Official PDF: https://openairdocs.org/files/sha256/08/60/08603ab8f69538b330518c9e1283ed3d4dbe61306a7b5e9d2465598edb92d9a4 (from https://www.govinfo.gov/content/pkg/FR-2023-01-11/pdf/2023-00420.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/01/11/2023-00420/airworthiness-directives-transport-and-commuter-category-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-00420-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-1647

## Summary

The FAA proposes to supersede Airworthiness Directive 2021-23- 12, which applies to all transport and commuter category airplanes equipped with a radio (also known as radar) altimeter. AD 2021-23-12 requires revising the limitations section of the existing airplane/ aircraft flight manual to incorporate limitations prohibiting certain operations requiring radio altimeter data when in the presence of 5G C- Band interference as identified by Notices to Air Missions. Since the FAA issued AD 2021-23-12, the FAA determined that additional limitations are needed due to the continued deployment of new 5G C-Band base stations whose signals are expected to cover most of the contiguous United States at transmission frequencies between 3.7-3.98 GHz. This proposed AD would require revising the limitations section of the existing airplane/aircraft flight manual to incorporate limitations prohibiting certain operations requiring radio altimeter data, due to the presence of 5G C-Band interference. This proposed AD would also require modifying certain airplanes to allow safe operations in the United States 5G C-Band radio frequency environment. The FAA is issuing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 11, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-00420, comments due Feb 10, 2023 (https://www.federalregister.gov/documents/2023/01/11/2023-00420/airworthiness-directives-transport-and-commuter-category-airplanes)

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