# Proposed AD FAA-2004-18994: McDonnell Douglas Model DC-9-14 and DC-9-15 Airplanes; and 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 2004-23-11
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 3, 2004, 69 FR 53853
- Comments due: October 18, 2004
- Became: [AD 2004-23-11](https://openairdocs.org/ad/2004-23-11)
- Docket: FAA-2004-18994 (https://www.regulations.gov/docket/FAA-2004-18994, where comments are filed)
- Project: 2003-NM-210-AD
- FR document: 04-20123
- Official PDF: https://openairdocs.org/files/sha256/7f/f2/7ff2cc00f09837fd3093a19eb0c2febf545281ad828f08ac23899df642f463d4 (from https://www.govinfo.gov/content/pkg/FR-2004-09-03/pdf/04-20123.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/09/03/04-20123/airworthiness-directives-mcdonnell-douglas-model-dc-9-14-and-dc-9-15-airplanes-and-model-dc-9-20
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EB66C9DD46EBC2FE85256F04005622E3.0001
- Page: https://openairdocs.org/proposed/FAA-2004-18994

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain McDonnell Douglas Model DC-9-14 and DC-9-15 airplanes; and Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 series airplanes. This proposed AD would require repetitive high frequency eddy current inspections to detect cracks in the vertical radius of the upper cap of the center wing rear spar, and repair if necessary. This proposed AD is prompted by reports of cracks in the upper cap of the center wing rear spar that resulted from stress corrosion. We are proposing this AD to detect and correct cracking of the left or right upper cap of the center rear spar, which could cause a possible fuel leak and structural failure of the upper cap, and result in reduced structural integrity of the airplane.

## Notices in this docket

- Sep 3, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-20123, comments due Oct 18, 2004 (https://www.federalregister.gov/documents/2004/09/03/04-20123/airworthiness-directives-mcdonnell-douglas-model-dc-9-14-and-dc-9-15-airplanes-and-model-dc-9-20)

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