# Proposed AD FAA-2015-6541: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-13-16
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 30, 2015, 80 FR 74726
- Comments due: January 14, 2016
- Became: [AD 2016-13-16](https://openairdocs.org/ad/2016-13-16)
- Docket: FAA-2015-6541 (https://www.regulations.gov/docket/FAA-2015-6541, where comments are filed)
- Project: 2015-NM-135-AD
- FR document: 2015-30223
- Official PDF: https://openairdocs.org/files/sha256/27/b8/27b80d8f432584337f24b6f69a41e488e2b3c5297645deb062424a55afa6f6fc (from https://www.govinfo.gov/content/pkg/FR-2015-11-30/pdf/2015-30223.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/11/30/2015-30223/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/199D43629BDAE70686257F0D00564B74.0001
- Page: https://openairdocs.org/proposed/FAA-2015-6541

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD was prompted by reports of a manufacturing oversight, in which a supplier omitted the required protective finish on certain bushings installed in the rear spar upper chord on horizontal stabilizers, which could lead to galvanic corrosion and consequent cracking of the rear spar upper chord. This proposed AD would require an inspection or records check to determine if affected horizontal stabilizers are installed, related investigative actions, and for affected horizontal stabilizers, repetitive inspections for any crack of the horizontal stabilizer rear spar upper chord, and corrective action if necessary. We are proposing this AD to detect and correct cracking of the rear spar upper chord, which can result in the failure of the upper chord and consequent departure of the horizontal stabilizer from the airplane,which can lead to loss of continued safe flight and landing.

## Notices in this docket

- Nov 30, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-30223, comments due Jan 14, 2016 (https://www.federalregister.gov/documents/2015/11/30/2015-30223/airworthiness-directives-the-boeing-company-airplanes)

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