# Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes, and Model MD-88 and MD-90 Airplanes
> **Rule** · Final rule. · Published 1996-06-04 · Effective 1996-07-09 · 61 FR 28028
## Document
- **Document number:** 96-13609
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model DC-9-80 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 61 FR 28028
- **Publication date:** 1996-06-04
- **Effective date:** 1996-07-09
- **FAA docket:** Docket No. 95-NM-188-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-80 series airplanes, and Model MD-88 and MD-90 airplanes, that requires a one-time measurement of the length of the oxygen mask lanyards of the passenger service unit (PSU), and modification of lanyards that are longer than the proper length. This amendment is prompted by a report that the length of the oxygen mask lanyards of the PSU were found to be too long, apparently due to improper installation during production. The actions specified by this AD are intended to ensure that the length of these oxygen mask lanyards is correct, so that the oxygen canister will be properly activated when needed during an emergency.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/06/04/96-13609/airworthiness-directives-mcdonnell-douglas-model-dc-9-80-series-airplanes-and-model-md-88-and-md-90)
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