# Proposed AD 2000-NM-324-AD: McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 Series Airplanes, and C-9 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2002-07-06
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 20, 2001, 66 FR 48384
- Comments due: November 5, 2001
- Became: [AD 2002-07-06](https://openairdocs.org/ad/2002-07-06)
- Docket: 2000-NM-324-AD
- FR document: 01-23417
- Official PDF: https://openairdocs.org/files/sha256/37/a2/37a28dc0c7ce0e8621ea34249d7c36f6a9ac5e90eb213cd3bbad9bf1216cd44c (from https://www.govinfo.gov/content/pkg/FR-2001-09-20/pdf/01-23417.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/09/20/01-23417/airworthiness-directives-mcdonnell-douglas-model-dc-9-10-20-30-40-and-50-series-airplanes-and-c-9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/48C331073740777D86256ACD0059F524.0001
- Page: https://openairdocs.org/proposed/2000-NM-324-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes, and C-9 airplanes. This proposal would require repetitive general visual and x-ray inspections to detect cracks of the upper and lower corners and upper center of the door cutout of the aft pressure bulkhead; corrective actions, if necessary; and follow-on actions. For certain airplanes, the proposal also would require modification of the ventral aft pressure bulkhead. This action is necessary to detect and correct fatigue cracks in the corners and upper center of the door cutout of the aft pressure bulkhead, which could result in rapid decompression of the fuselage and consequent reduced structural integrity of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Sep 20, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-23417, comments due Nov 5, 2001 (https://www.federalregister.gov/documents/2001/09/20/01-23417/airworthiness-directives-mcdonnell-douglas-model-dc-9-10-20-30-40-and-50-series-airplanes-and-c-9)

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