# Proposed AD 97-NM-187-AD: Dornier Model 328 Series Airplanes Equipped with Honeywell GP-300 Guidance and Display Controller

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-26-14
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 28, 1998, 63 FR 29148
- Comments due: June 29, 1998
- Became: [AD 2001-26-14](https://openairdocs.org/ad/2001-26-14)
- Docket: 97-NM-187-AD
- FR document: 98-14035
- Official PDF: https://openairdocs.org/files/sha256/37/ad/37adce82a45d78e8f6765b62c746aacb0a0abc176b3bf93a4cca7395c2d3d13a (from https://www.govinfo.gov/content/pkg/FR-1998-05-28/pdf/98-14035.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/05/28/98-14035/airworthiness-directives-dornier-model-328-series-airplanes-equipped-with-honeywell-gp-300-guidance
- Page: https://openairdocs.org/proposed/97-NM-187-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Dornier Model 328 series airplanes, that currently requires modification of certain Honeywell GP-300 guidance and display controllers. That AD was prompted by reports of smoke and fumes emitting from the Honeywell GP-300 guidance and display controller due to a defective light bulb; and a report of failure of the autopilot to disconnect manually. The actions specified by that AD are intended to prevent a defective light bulb from causing a short circuit that emits smoke and fumes into the cockpit; or causing damage to the circuit cards and various components, which may lock the autopilot into the engaged mode. Locking of the autopilot into the engaged mode could lead to the inability of the pilot to disconnect the autopilot, which could result in reduced controllability of the airplane. This action would require verification of proper installation of the modification, and repair, if necessary.

## Notices in this docket

- May 28, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-14035, comments due Jun 29, 1998 (https://www.federalregister.gov/documents/1998/05/28/98-14035/airworthiness-directives-dornier-model-328-series-airplanes-equipped-with-honeywell-gp-300-guidance)

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