# Proposed AD FAA-2009-0160: McDonnell Douglas Model MD-90-30 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-13-08
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 23, 2009, 74 FR 12100
- Comments due: May 7, 2009
- Became: [AD 2009-13-08](https://openairdocs.org/ad/2009-13-08)
- Docket: FAA-2009-0160 (https://www.regulations.gov/docket/FAA-2009-0160, where comments are filed)
- Project: 2008-NM-176-AD
- FR document: E9-6218
- Official PDF: https://openairdocs.org/files/sha256/07/72/0772441b50c7e4d5762907f8cdeef0b54a293d7d07ad5d0f547e2262e6a5c4c4 (from https://www.govinfo.gov/content/pkg/FR-2009-03-23/pdf/E9-6218.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/03/23/E9-6218/airworthiness-directives-mcdonnell-douglas-model-md-90-30-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A3FBC1C4A8F3FD1C8625758200590FDE.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0160

## Summary

We propose to adopt a new airworthiness directive (AD) for all McDonnell Douglas Model MD-90-30 airplanes. This proposed AD would require repetitive inspections for cracks of the upper aft skin panels on the horizontal stabilizer, and related investigative and corrective actions if necessary. This proposed AD results from a report of cracks found in the aft skin panels on the upper right side of the horizontal stabilizer at the aft inboard corner. We are proposing this AD to detect and correct cracks in the fail-safe structure that may not be able to sustain limit load, which could result in the loss of overall structural integrity of the horizontal stabilizer.

## Notices in this docket

- Mar 23, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-6218, comments due May 7, 2009 (https://www.federalregister.gov/documents/2009/03/23/E9-6218/airworthiness-directives-mcdonnell-douglas-model-md-90-30-airplanes)

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