# Proposed AD FAA-2011-1415: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-12-09
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 19, 2012, 77 FR 2664
- Comments due: March 5, 2012
- Became: [AD 2012-12-09](https://openairdocs.org/ad/2012-12-09)
- Docket: FAA-2011-1415 (https://www.regulations.gov/docket/FAA-2011-1415, where comments are filed)
- Project: 2011-NM-145-AD
- FR document: 2012-858
- Official PDF: https://openairdocs.org/files/sha256/c1/97/c197f3c626b01cd5a63e622e14ce204dffa569fd42dc80a184198e875d4ffd1c (from https://www.govinfo.gov/content/pkg/FR-2012-01-19/pdf/2012-858.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/01/19/2012-858/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4EC7017923B7012C8625798A004CF350.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1415

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 717-200 airplanes. This proposed AD was prompted by reports of cracks found on the center section ribs of the horizontal stabilizers. This proposed AD would require repetitive inspections for cracking of the aft face of the left and right rib hinge bearing lugs of the center section of the horizontal stabilizer; and crack measurement, repairs, and installation of a new center section rib if necessary. We are proposing this AD to detect and correct cracks in the left and right bearing lugs of the rib hinge spreading at the same time, which could result in failure of both hinge bearing lugs. Failure of the hinge bearing lugs could result in the inability of the horizontal stabilizer to sustain flight loads and therefore reduce the controllability of the airplane.

## Notices in this docket

- Jan 19, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-858, comments due Mar 5, 2012 (https://www.federalregister.gov/documents/2012/01/19/2012-858/airworthiness-directives-the-boeing-company-airplanes)

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