# Airworthiness Directives; McDonnell Douglas Model MD-90-30 Series Airplanes
> **Rule** · Final rule. · Published 1999-10-20 · Effective 1999-11-24 · 64 FR 56424
## Document
- **Document number:** 99-26934
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model MD-90-30 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 56424
- **Publication date:** 1999-10-20
- **Effective date:** 1999-11-24
- **FAA docket:** Docket No. 98-NM-340-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-90-30 series airplanes, that requires a one-time inspection to measure clearance and detect interference between the elevator cable pulley and the shroud frame of the ventral stairway, and modification of the shroud frame of the ventral stairway. This amendment is prompted by reports of pitch oscillation of several Model MD-90-30 series airplanes. The actions specified by this AD are intended to prevent interference between the elevator cable pulley and the shroud frame of the ventral stairway, which could result in pitch oscillation of the airplane, and consequent damage to the elevator cable pulley and reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/10/20/99-26934/airworthiness-directives-mcdonnell-douglas-model-md-90-30-series-airplanes)
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