# Proposed AD 99-NM-210-AD: McDonnell Douglas Model MD-90-30 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-03-08
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 27, 1999, 64 FR 57790
- Comments due: December 13, 1999
- Became: [AD 2000-03-08](https://openairdocs.org/ad/2000-03-08)
- Docket: 99-NM-210-AD
- FR document: 99-28078
- Official PDF: https://openairdocs.org/files/sha256/70/29/70299c3600674dfcf59ee90eca742a89c3319bacccdcd732f3d346a8ef78f86c (from https://www.govinfo.gov/content/pkg/FR-1999-10-27/pdf/99-28078.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/10/27/99-28078/airworthiness-directives-mcdonnell-douglas-model-md-90-30-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-210-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model MD-90-30 series airplanes. This proposal would require repetitive fluorescent penetrant and magnetic particle inspections to detect fatigue cracking of the main landing gear (MLG) piston, and repair, if necessary. This proposal is prompted by reports of MLG failures during towing of in-service airplanes due to fatigue cracks. The actions specified by the proposed AD are intended to detect and correct fatigue cracking of MLG pistons, which could result in failure of the pistons, and consequent damage to the airplane structure and injury to flight crew, passengers, or ground personnel.

## Notices in this docket

- Oct 27, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-28078, comments due Dec 13, 1999 (https://www.federalregister.gov/documents/1999/10/27/99-28078/airworthiness-directives-mcdonnell-douglas-model-md-90-30-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.