# Airworthiness Directives; Lockheed Model L-1011-385 Series Airplanes
> **Rule** · Final rule. · Published 1999-08-20 · Effective 1999-09-24 · 64 FR 45423
## Document
- **Document number:** 99-21363
- **Category:** airworthiness
- **Manufacturer:** Lockheed Model L-1011-385 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 45423
- **Publication date:** 1999-08-20
- **Effective date:** 1999-09-24
- **FAA docket:** Docket No. 98-NM-315-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Lockheed Model L-1011-385 series airplanes, that requires repetitive inspections to detect discrepancies of the lower actuator pins and/or bushings of the horizontal stabilizer, and replacement of any discrepant component with a new component. Replacement of all four actuator pins and bushings terminates the repetitive inspections. This amendment is prompted by a report indicating that a fractured lower actuator pin of the horizontal stabilizer was detected. The actions specified by this AD are intended to detect and correct discrepancies of the lower actuator pins and bushings of the horizontal stabilizer, which could result in reduced structural integrity of the horizontal stabilizer control system, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/08/20/99-21363/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)
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