# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2012-12-10 · Effective 2013-01-14 · 77 FR 73282
## Document
- **Document number:** 2012-29469
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 73282
- **Publication date:** 2012-12-10
- **Effective date:** 2013-01-14
- **FAA docket:** Docket No. FAA-2012-0186
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by reports of flight crew failure to activate air data probe heat. This AD requires modifying the anti-icing system for the angle of attack sensor, the total air temperature, and the pitot probes. We are issuing 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/12/10/2012-29469/airworthiness-directives-the-boeing-company-airplanes)
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