Page 1-14
500W Series Installation Manual
Rev. D
190-00357-02
TSO Deviation
7.
Garmin was granted a deviation from TSO-C146a from RTCA/DO-229C paragraphs 2.1.1.10, 2.1.1.7,
2.1.1.8.1, 2.1.1.8.2, 2.1.1.9, 2.1.2.1, 2.1.3.1, 2.1.4.1.4, 2.1.4.1.5 and 2.1.5.1 in the form of an operational
limitation to achieve an equivalent level of safety. The operational limitation is based on:
a. The ability to use antennas that may not meet the minimum gain performance requirements of DO-
228.
b. The ability to mitigate the effects of the different gain characteristics of those antennas by increasing
the effective mask angle through operational limitations.
c. The ability to further increase the effective mask angle, through operational limitations, to a level
commensurate with test conditions used in the original TSO qualification tests.
d. The ability to use -128 dBmic as the minimum GPS satellite signal-in-space for the purpose of
assessing the operational limitation.
e. The ability to use -128 dBmic as the minimum SBAS satellite signal-in-space for the purpose of
assessing the operational limitation. NOTE 1
C146a
cont’d
8. Garmin was granted a deviation from TSO-C146a paragraph 2.1.1.9 to use 20 seconds (instead of 10
seconds) to reacquire a dropped satellite under the conditions described in the paragraph. The 20 second
period is the time period specified by the new DO-229d. NOTE 1
Note 1: No. 7 deviation is applicable with GPS software version 2.X
No. 8 deviation is applicable with GPS software version 3.0 or newer.
1.6.3
FCC Grant of Equipment Authorization
GNS 530W
FCC ID: IPH-0021400
GNS 530AW FCC ID: IPH-0061100
Summary of Contents for GNS 530W
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