# Proposed AD 2001-NM-78-AD: McDonnell Douglas DC-9-10, -20, -30, -40, and -50 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2002-26-10
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 30, 2002, 67 FR 55732
- Comments due: October 15, 2002
- Became: [AD 2002-26-10](https://openairdocs.org/ad/2002-26-10)
- Docket: 2001-NM-78-AD
- FR document: 02-22133
- Official PDF: https://openairdocs.org/files/sha256/14/13/14134f711f0b998cd87e8af9714e875fe5d9bfdee6eb41bee5fd0a906e12c0a6 (from https://www.govinfo.gov/content/pkg/FR-2002-08-30/pdf/02-22133.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/08/30/02-22133/airworthiness-directives-mcdonnell-douglas-dc-9-10--20--30--40-and--50-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2C6038B14CFFBE6486256C29005B155D.0001
- Page: https://openairdocs.org/proposed/2001-NM-78-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain McDonnell Douglas DC-9-10, -20, -30, -40, and -50 series airplanes. The existing AD requires a one-time visual inspection to determine the modification status of the corners of the forward lower cargo doorjamb; low-frequency eddy current inspections to detect cracks of the fuselage skin and doubler at all corners of the forward lower cargo doorjamb; various follow-on repetitive inspections; and modification, if necessary. This action would retain those requirements but would require certain high-frequency, rather than low-frequency, eddy current inspections for certain conditions. The actions specified by the proposed AD are intended to detect and correct cracking, 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

- Aug 30, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-22133, comments due Oct 15, 2002 (https://www.federalregister.gov/documents/2002/08/30/02-22133/airworthiness-directives-mcdonnell-douglas-dc-9-10--20--30--40-and--50-series-airplanes)

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