# Proposed AD 94-CE-31-AD: Beech Aircraft Corporation Models 1900, 1900C, and 1900D Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 95-14-02
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 10, 1995, 60 FR 7919
- Comments due: April 21, 1995
- Became: [AD 95-14-02](https://openairdocs.org/ad/95-14-02)
- Docket: 94-CE-31-AD
- FR document: 95-3359
- Official PDF: https://openairdocs.org/files/sha256/65/06/65063b65c8088493db772c48d7589234b1683f0f388843185dc86126958eee0b (from https://www.govinfo.gov/content/pkg/FR-1995-02-10/pdf/95-3359.pdf)
- Federal Register: https://www.federalregister.gov/documents/1995/02/10/95-3359/airworthiness-directives-beech-aircraft-corporation-models-1900-1900c-and-1900d-airplanes
- Page: https://openairdocs.org/proposed/94-CE-31-AD

## Summary

This document proposes to supersede Airworthiness Directive (AD) 91-24-15, which currently requires modifying the instrument air plumbing system on Beech Aircraft Corporation (Beech) Models 1900 and 1900C airplanes. The proposed action would require an additional modification to the plumbing of the instrument air system on the Models 1900 and 1900C airplanes, and would add the Model 1900D airplanes to the applicability. Eight reports of moisture freezing in this system on airplanes with the modification required by AD 91-24-15 incorporated prompted the proposed action. In addition, recent testing on the Model 1900D indicates that the design of the instrument air system on these airplanes is also conducive to moisture freeze-ups. The actions specified by the proposed AD are intended to prevent ice formation in the plumbing of the instrument air system, which, if not detected and corrected, could result in aerodynamic problems and subsequent loss of control of the airplane.

## Notices in this docket

- Feb 10, 1995: Notice of proposed rulemaking (NPRM). (first notice), FR document 95-3359, comments due Apr 21, 1995 (https://www.federalregister.gov/documents/1995/02/10/95-3359/airworthiness-directives-beech-aircraft-corporation-models-1900-1900c-and-1900d-airplanes)

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