Garmin GTX 330 Installation Manual page 80

AMC
Item #
Section #
If more than one ADS-B transmit system is
49. 8.3.8 installed, simultaneous operation of both
transmit systems needs to be prevented.
50. 8.4 Horizontal Position Data Sources
The requirements on horizontal position data
51. 8.4.1 sources are based on the ED-126 safety and
performance assessments.
Components of horizontal position data sources
external to the aircraft ADS-B system (such as
the GNSS space segment) fall outside these
airworthiness considerations. Such external
components are assumed to operate in
accordance with their specified nominal
52. 8.4.2
performance.
Nevertheless, failures of the external data
source components are required to be detected
through on-board monitoring (as expressed in
section 8.4.3).
Any eligible horizontal position data source
needs to meet the following minimum
requirements (refer also to Table 2 in Appendix
3):
• Correct encoding of quality indicator
information in line with the actual performance
of the selected horizontal position data
source(s), i.e. in relation to position integrity
containment bound (ED-102/DO-260 and DO-
260A ADS-B transmit systems) and position
53. 8.4.3
accuracy (DO-260A ADS-B transmit systems);
• Position source failure probability: 10
hour;
• Position integrity alert failure probability,
commensurate with the performance
characteristics of GNSS integrity monitoring:
10
• Position integrity time to alert: 10 seconds.
GTX 330/330D Installation Manual
Page B-8
Table B-1 Compliance Matrix
AMC Item
-3
(per position source failure event);
Compliance Summary
When two GTX 330 transponders
are installed IAW requirements,
simultaneous operation of both
transponders is not possible.
Selection of the active transponder
is accomplished by a dedicated
transponder 1 / 2 discrete switch
located in the cockpit.
[Section heading, no compliance
statement req'd]
[General information, no
compliance statement req'd]
[General information, no
compliance statement req'd]
"Correct encoding" -The GTX 330
encoding is compliant with DO-
260A.
Garmin GNS Equipment:
"Position source failure
probability" - This requirement is
met by the GPS/SBAS system and
is not applicable to the GPS
position equipment itself.
"Position integrity alert failure
probability" - missed alert
probability is 10
-3
/hr in all modes.
-4
per
"Position integrity time-to-alert" –
the 10 second position integrity
time to alert is met in all modes.
Other:
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190-00207-02
Rev. U