# Proposed AD FAA-2021-1005: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-15-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 28, 2021, 86 FR 73694
- Comments due: February 11, 2022
- Became: [AD 2022-15-07](https://openairdocs.org/ad/2022-15-07)
- Docket: FAA-2021-1005 (https://www.regulations.gov/docket/FAA-2021-1005, where comments are filed)
- Project: AD-2021-00842-T
- FR document: 2021-27974
- Official PDF: https://openairdocs.org/files/sha256/fd/d8/fdd89c4b2ba34156ae33c91fe948d38a2abf78fa9cde2c855d40a99d861cbbba (from https://www.govinfo.gov/content/pkg/FR-2021-12-28/pdf/2021-27974.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/12/28/2021-27974/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2021-27974-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1005

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This proposed AD was prompted by a report that after a certain circuit breaker tripped, power to the two pitot-static (P/S) probe heaters on the right-hand side was lost, and the flightcrew discovered conflicting procedures in the flightcrew operations manual/quick reference handbook (FCOM/QRH). This proposed AD would require revising the existing airplane flight manual (AFM) to incorporate procedures to be applied during P/S probe heater failure conditions. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Dec 28, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-27974, comments due Feb 11, 2022 (https://www.federalregister.gov/documents/2021/12/28/2021-27974/airworthiness-directives-the-boeing-company-airplanes)

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