# Airworthiness Directives; Short Brothers Model SD3-SHERPA, SD3-60 SHERPA, SD3-30, and SD3-60 Series Airplanes
> **Rule** · Final rule. · Published 1999-09-01 · Effective 1999-10-06 · 64 FR 47660
## Document
- **Document number:** 99-22533
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 47660
- **Publication date:** 1999-09-01
- **Effective date:** 1999-10-06
- **FAA docket:** Docket No. 99-NM-12-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-SHERPA, SD3-60 SHERPA, SD3- 30, and SD3-60 series airplanes, that requires replacement of the existing bolts that secure the elevator control torque tube bearing housing retaining plate with hex head bolts. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent reduced movement of the elevator controls and consequent reduced controllability of the airplane, as a result of bolts coming loose on the elevator control torque tube bearing housing retaining plate.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/01/99-22533/airworthiness-directives-short-brothers-model-sd3-sherpa-sd3-60-sherpa-sd3-30-and-sd3-60-series)
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