# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2019-05-22 · Effective 2019-06-26 · 84 FR 23458
## Document
- **Document number:** 2019-10657
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 23458
- **Publication date:** 2019-05-22
- **Effective date:** 2019-06-26
- **FAA docket:** Docket No. FAA-2018-0961
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This AD was prompted by reports indicating that the pitot heat switch is not always set to ON, which could result in misleading air data. This AD requires replacement of pitot anti-icing system components, installation of a junction box and wiring provisions, repetitive testing of the anti- icing system, and applicable on-condition actions. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/05/22/2019-10657/airworthiness-directives-the-boeing-company-airplanes)
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