# Proposed AD FAA-2018-0961: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-09-01
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 19, 2018, 83 FR 58196
- Comments due: January 3, 2019
- Became: [AD 2019-09-01](https://openairdocs.org/ad/2019-09-01)
- Docket: FAA-2018-0961 (https://www.regulations.gov/docket/FAA-2018-0961, where comments are filed)
- FR document: 2018-25001
- Official PDF: https://openairdocs.org/files/sha256/81/4d/814dc04d4fe65f669f93c524317ffa7778b802bcaa94ff6e888ef2c485caf42a (from https://www.govinfo.gov/content/pkg/FR-2018-11-19/pdf/2018-25001.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/11/19/2018-25001/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/329522C9A557E5EA8625834B005C93E5.0001
- Page: https://openairdocs.org/proposed/FAA-2018-0961

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This proposed 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 proposed AD would require 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 proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Nov 19, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-25001, comments due Jan 3, 2019 (https://www.federalregister.gov/documents/2018/11/19/2018-25001/airworthiness-directives-the-boeing-company-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.