# Proposed AD FAA-2005-21140: 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 2005-19-08
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 9, 2005, 70 FR 24338
- Comments due: June 23, 2005
- Became: [AD 2005-19-08](https://openairdocs.org/ad/2005-19-08)
- Docket: FAA-2005-21140 (https://www.regulations.gov/docket/FAA-2005-21140, where comments are filed)
- Project: 2004-NM-274-AD
- FR document: 05-9188
- Official PDF: https://openairdocs.org/files/sha256/a9/ce/a9cefb9964ea3b9fca5b6fb93f9a9ff495d2239a8817a604a4b75d0d05f07e8c (from https://www.govinfo.gov/content/pkg/FR-2005-05-09/pdf/05-9188.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/05/09/05-9188/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/7CB86A57B3C0BC7586256FFC006361C6.0001
- Page: https://openairdocs.org/proposed/FAA-2005-21140

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all transport category airplanes listed above. This proposed AD would require repetitive inspections for cracks of the main landing gear (MLG) shock strut cylinder, and related investigative and corrective actions if necessary. This proposed AD is prompted by 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

- May 9, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-9188, comments due Jun 23, 2005 (https://www.federalregister.gov/documents/2005/05/09/05-9188/airworthiness-directives-mcdonnell-douglas-model-dc-9-14-dc-9-15-and-dc-9-15f-airplanes-and)

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