# Proposed AD 2003-NM-169-AD: McDonnell Douglas Model MD-90-30 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-11-15 R1
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 21, 2003, 68 FR 50491
- Comments due: October 6, 2003
- Became: [AD 2003-11-15 R1](https://openairdocs.org/ad/2003-11-15-R1)
- Docket: 2003-NM-169-AD
- FR document: 03-21414
- Official PDF: https://openairdocs.org/files/sha256/b0/34/b034b5efead4bd71c24d8d45b6c175f82b63bd00e2cd1fa7cac782d7ce376eb3 (from https://www.govinfo.gov/content/pkg/FR-2003-08-21/pdf/03-21414.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/08/21/03-21414/airworthiness-directives-mcdonnell-douglas-model-md-90-30-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/594D7C2F1550342C86256D89004FA0D6.0001
- Page: https://openairdocs.org/proposed/2003-NM-169-AD

## Summary

This document proposes to revise an existing airworthiness directive (AD), applicable to all McDonnell Douglas Model MD-90-30 airplanes, that currently requires replacing the lanyards on the pressure relief door for the thrust reverser with new, improved lanyards, and doing associated modifications. The actions specified by that AD are intended to ensure that the lanyards on the pressure relief door have adequate strength. Lanyards of inadequate strength could allow the pressure relief door to detach from the thrust reverser in the event that an engine bleed air duct bursts, which could result in the detached door striking and damaging the horizontal stabilizer, and consequent reduced controllability of the airplane. This proposed AD is prompted by the fact that a certain paragraph of the existing AD prohibits installation of certain part numbers of lanyards; the numbers listed in that paragraph correspond to new, improved lanyards that are acceptable for installation. This action would correct these part numbers to prohibit installation of suspect lanyards while allowing installation of the new, improved lanyards. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Aug 21, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-21414, comments due Oct 6, 2003 (https://www.federalregister.gov/documents/2003/08/21/03-21414/airworthiness-directives-mcdonnell-douglas-model-md-90-30-airplanes)

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