# Proposed AD FAA-2009-0658: McDonnell Douglas Model DC-9-14, DC-9- 15, and DC-9-15F Airplanes; and McDonnell Douglas Model DC-9-20, DC-9- 30, DC-9-40, and DC-9-50 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-24-21
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 30, 2009, 74 FR 37963
- Comments due: September 14, 2009
- Became: [AD 2009-24-21](https://openairdocs.org/ad/2009-24-21)
- Docket: FAA-2009-0658 (https://www.regulations.gov/docket/FAA-2009-0658, where comments are filed)
- Project: 2009-NM-058-AD
- FR document: E9-18157
- Official PDF: https://openairdocs.org/files/sha256/63/03/63031f228ec821b649de578a3eaa8c1b3f7b2d4bba927aff412797839ad0a151 (from https://www.govinfo.gov/content/pkg/FR-2009-07-30/pdf/E9-18157.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/07/30/E9-18157/airworthiness-directives-mcdonnell-douglas-model-dc-9-14-dc-9-15-and-dc-9-15f-airplanes-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EF330ADF03753BC586257603004C3406.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0658

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all McDonnell Douglas Model DC-9-14, DC- 9-15, and DC-9-15F airplanes; and McDonnell Douglas Model DC-9-20, DC- 9-30, DC-9-40, and DC-9-50 series airplanes. The existing AD currently requires repetitive inspections for cracks of the main landing gear (MLG) shock strut cylinder, and related investigative and corrective actions if necessary. This proposed AD would add more work on airplanes that have main landing gear shock struts with certain identified part numbers. This proposed AD results from two reports of a collapsed MLG and a report of cracks in two MLG cylinders. We are proposing this AD to detect and correct fatigue cracks in the shock strut cylinder of the MLG, which could result in a collapsed MLG during takeoff or landing, and possible reduced structural integrity of the airplane.

## Notices in this docket

- Jul 30, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-18157, comments due Sep 14, 2009 (https://www.federalregister.gov/documents/2009/07/30/E9-18157/airworthiness-directives-mcdonnell-douglas-model-dc-9-14-dc-9-15-and-dc-9-15f-airplanes-and)

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