# Proposed AD FAA-2012-0186: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-24-08
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 28, 2012, 77 FR 11789
- Comments due: April 13, 2012
- Became: [AD 2012-24-08](https://openairdocs.org/ad/2012-24-08)
- Docket: FAA-2012-0186 (https://www.regulations.gov/docket/FAA-2012-0186, where comments are filed)
- Project: 2011-NM-268-AD
- FR document: 2012-4645
- Official PDF: https://openairdocs.org/files/sha256/0d/3b/0d3b8e18a87eb94e794e8a5f499f2447c8c33ed12a2cb0ccad330f7a6bd87266 (from https://www.govinfo.gov/content/pkg/FR-2012-02-28/pdf/2012-4645.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/02/28/2012-4645/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/67629DE94B8DA017862579B200547958.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0186

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD was prompted by reports of flight crew failure to activate air data probe heat. This proposed AD would require modifying the anti-icing system for the angle of attack sensor, the total air temperature, and the pitot probes. We are proposing this AD to prevent ice from forming on air data system sensors and consequent loss of or misleading airspeed indication on all airspeed indicating systems, which could lead to loss of control of the airplane.

## Notices in this docket

- Feb 28, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-4645, comments due Apr 13, 2012 (https://www.federalregister.gov/documents/2012/02/28/2012-4645/airworthiness-directives-the-boeing-company-airplanes)

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