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# AC 20-138A - Airworthiness Approval of Global Navigation Satellite System (GNSS) Equipment (Cancelled)

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## Document Information

- Number
- 20-138A
- Title
- Airworthiness Approval of Global Navigation Satellite System   (GNSS) Equipment
- Date cancelled
- 2010-09-27
- Cancellation notes
- AC 20-138B
- Date issued
- 2003-12-22
- Office of Primary Responsibility
- AIR-130, Aviation Safety - Aircraft Certification Service, Aircraft Engineering Division
- Description
-  	Establishes an acceptable means, but not the only means, of obtaining airworthiness approval of Global Positioning System (GPS) equipment for use as a supplemental navigation system for oceanic and remote domestic en route, terminal, and non-precision instrument approach (except localizer directional aid (LDA) and simplified directional facility (SDF) operations. 
- Content
-    -  AC20-138A.pdf  (PDF) 
- Cancels
-  CancelsNumberTitleDate20-138Airworthiness Approval of Global Positioning System (GPS) Navigation Equipment for use as a VFR and IFR Supplemental Navigation System
	This advisory circular (AC) establishes an acceptable means, but not the only means, of obtaining airworthiness approval of Global Positioning System (GPS) equipment for use as a supplemental navigation system for oceanic and remote, domestic en route, terminal, and non-precision instrument approach [except localizer, localizer directional aid (LDA) and simplified directional facility (SDF)] operations. This document addresses the approval of stand-alone (e.g., TSO-C129 Class A())GPS equipment only (AC 90-45A, Approval of Area Navigation Systems for Use in the U.S. National Airspace System, does not apply). Approval of navigation or flight management systems integrating Classes B() and C() GPS equipment in a multi-sensor navigation system is addressed in AC 20-130A, Airworthiness Approval of Navigation or Flight Management Systems Integrating Multiple Navigation Sensors. This document does not address GPS equipment incorporating differential GPS capability. Like all advisory material, this advisory circular is not mandatory and does not constitute a requirement. As such, the terms "shall" and "must" used in this advisory circular pertain to an applicant who chooses to follow the method presented.

	This AC supersedes previous GPS installation guidance contained in: FAA Notice 8110.47, Airworthiness Approval of Global Positioning System (GPS) Navigation Equipment for User as a VFR and IFR Supplemental Navigation System, and FAA Interim Guidance Memoranda dated February 25, 1991; April 5, 1991; March 20, 1992; July 20, 1992; and September 21,1993. The appropriate information contained in those documents is incorporated in this AC.
1994-05-25 

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