# Proposed AD FAA-2015-1990: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-01-05
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 2, 2015, 80 FR 38033
- Comments due: August 17, 2015
- Became: [AD 2016-01-05](https://openairdocs.org/ad/2016-01-05)
- Docket: FAA-2015-1990 (https://www.regulations.gov/docket/FAA-2015-1990, where comments are filed)
- Project: 2015-NM-027-AD
- FR document: 2015-16155
- Official PDF: https://openairdocs.org/files/sha256/37/c5/37c502ed5d7e1e7a7fe5d1def538b03db7ccade621a84cd3f6a0448d332b5bbb (from https://www.govinfo.gov/content/pkg/FR-2015-07-02/pdf/2015-16155.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/07/02/2015-16155/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B57837D54E51C12786257E76004BA4BF.0001
- Page: https://openairdocs.org/proposed/FAA-2015-1990

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-400 series airplanes, as modified by a certain supplemental type certificate. This proposed AD was prompted by the discovery of a design drawing error regarding placards that identified incorrect squibs and pressure switches for certain fire extinguisher bottles. This proposed AD would require a detailed inspection of certain cargo placards to determine if they are the correct placards and in the correct location, a detailed inspection of the harnesses to verify that they are marked and installed correctly, and corrective action if necessary. We are proposing this AD to detect and correct incorrectly installed harnesses for the cargo fire suppression system bottles, which could result in an incorrect activation sequence of the bottles, the inability to suppress a cargo fire quickly, and a possible uncontrollable fire.

## Notices in this docket

- Jul 2, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-16155, comments due Aug 17, 2015 (https://www.federalregister.gov/documents/2015/07/02/2015-16155/airworthiness-directives-the-boeing-company-airplanes)

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