# Airworthiness Directives; Short Brothers Model SD3-60 SHERPA, SD3-SHERPA, SD3-30, and SD3-60 Series Airplanes
> **Rule** · Final rule. · Published 2001-01-30 · Effective 2001-02-20 · 66 FR 8167
## Document
- **Document number:** 01-2110
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 8167
- **Publication date:** 2001-01-30
- **Effective date:** 2001-02-20
- **FAA docket:** Docket No. 99-NM-226-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 SHERPA, SD3-SHERPA, SD3- 30, and SD3-60 series airplanes, that requires replacement of the existing pneumatic de-icing boot pressure indicator switch with a newly designed switch. This amendment is prompted by an occurrence on a similar airplane model in which the pneumatic de-icing boot indication light may have provided the flightcrew with misleading information as to the proper functioning of the de-icing boots. The actions specified by this AD are intended to prevent ice accumulation on the airplane leading edges, which could reduce controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/01/30/01-2110/airworthiness-directives-short-brothers-model-sd3-60-sherpa-sd3-sherpa-sd3-30-and-sd3-60-series)
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