# Proposed AD 97-NM-144-AD: Saab Model SAAB 2000 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-19-06
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 14, 1998, 63 FR 37795
- Comments due: August 13, 1998
- Became: [AD 98-19-06](https://openairdocs.org/ad/98-19-06)
- Docket: 97-NM-144-AD
- FR document: 98-18645
- Official PDF: https://openairdocs.org/files/sha256/29/fa/29fab09e60f1268b319af3658931e515f1da5482a294640c18511a678da4cbbf (from https://www.govinfo.gov/content/pkg/FR-1998-07-14/pdf/98-18645.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/07/14/98-18645/airworthiness-directives-saab-model-saab-2000-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-144-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Saab Model SAAB 2000 series airplanes. This proposal would require replacing the radio tuning units (RTU's) and associated components with new, improved parts. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent NAV/ COM radios from simultaneously changing tuned frequencies and transponder codes due to a black screen failure or ``blanking'' of an RTU, which could result in loss of communications capability and air traffic control data.

## Notices in this docket

- Jul 14, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-18645, comments due Aug 13, 1998 (https://www.federalregister.gov/documents/1998/07/14/98-18645/airworthiness-directives-saab-model-saab-2000-series-airplanes)

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