« Back to Advisory Circulars Main Page

20-163 - Displaying Geometric Altitude Relative to Mean Sea Level

Date Issued
July 09, 2009
Responsible Office
AIR-100
Description
a. This advisory circular (AC) shows you how to gain a type certificate (TC), supplemental TC (STC), amended TC (ATC), amended supplemental TC (ASTC), or technical standard order (TSO) authorization for systems incorporating the presentation of geometric altitude relative to mean sea level (MSL) on electronic displays. b. This AC is not mandatory and does not constitute a regulation. In it, we describe an acceptable means, though it is not the only means, to gain approval. If you use the means described, you must follow it in all important respects.