# Proposed AD 97-NM-99-AD: McDonnell Douglas Model DC-9-31 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-23-11
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 27, 1998, 63 FR 3852
- Comments due: March 13, 1998
- Became: [AD 98-23-11](https://openairdocs.org/ad/98-23-11)
- Docket: 97-NM-99-AD
- FR document: 98-1858
- Official PDF: https://openairdocs.org/files/sha256/e7/0c/e70c1a823596a42173daf8bfc600864db228896741c81c05f0f47496826004cb (from https://www.govinfo.gov/content/pkg/FR-1998-01-27/pdf/98-1858.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/01/27/98-1858/airworthiness-directives-mcdonnell-douglas-model-dc-9-31-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-99-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9-31 series airplanes. This proposal would require a one-time visual inspection to determine if all corners of the forward service door doorjamb have been modified previously, various follow-on repetitive inspections, and modification, if necessary. This proposal is prompted by reports of fatigue cracks found in the fuselage skin and doubler at the corners of the forward service door doorjamb. The actions specified by the proposed AD are intended to detect and correct such fatigue cracking, which could result in rapid decompression of the fuselage and consequent reduced structural integrity of the airplane.

## Notices in this docket

- Jan 27, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-1858, comments due Mar 13, 1998 (https://www.federalregister.gov/documents/1998/01/27/98-1858/airworthiness-directives-mcdonnell-douglas-model-dc-9-31-series-airplanes)

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