# Proposed AD 2002-NM-254-AD: Aircraft Equipped With Garmin AT, Apollo GX Series Global Positioning System (GPS) Navigation Units With Software Versions 3.0 Through 3.4 Inclusive

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-13-20
- Products: Garmin International
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 1, 2004, 69 FR 17076
- Comments due: May 17, 2004
- Became: [AD 2004-13-20](https://openairdocs.org/ad/2004-13-20)
- Docket: 2002-NM-254-AD
- FR document: 04-7288
- Official PDF: https://openairdocs.org/files/sha256/8b/eb/8beb1edf8108d7f129a083e521611cad3f0d565e19e95e3baa6f7237505a468c (from https://www.govinfo.gov/content/pkg/FR-2004-04-01/pdf/04-7288.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/04/01/04-7288/airworthiness-directives-aircraft-equipped-with-garmin-at-apollo-gx-series-global-positioning-system
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/212F2331A0E7305A86256E69004EB985.0001
- Page: https://openairdocs.org/proposed/2002-NM-254-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to aircraft equipped with Garmin AT, Apollo GX series GPS navigation units with software versions 3.0 through 3.4 inclusive. This proposal would require modification and testing of the software for Apollo GX50/55/60/65 TSO-C129a GPS navigation units; and reidentification of the part. This action is necessary to prevent the GPS navigation unit, under certain conditions, from providing erroneous cross-deviation information, which could result in the aircraft deviating from its intended course for a brief period of time. Erroneous information may also place an excessive workload on the flightcrew while they monitor other available navigation data to avoid deviating off course. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Apr 1, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-7288, comments due May 17, 2004 (https://www.federalregister.gov/documents/2004/04/01/04-7288/airworthiness-directives-aircraft-equipped-with-garmin-at-apollo-gx-series-global-positioning-system)

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