Garmin GTX 330 Installation Manual page 82

AMC
Item #
Section #
Use of Alternative Compliant Position Data
Sources
As the ED-126 safety and performance
assessments are based on the performance and
60. 8.4.7
characteristics of GNSS systems, for alternative
position sources a dedicated safety and
performance assessment is required to
demonstrate compliance with the ED-126
requirements.
Use of Temporary Back-up Position Data
Sources
Back-up position data sources not complying
with the requirements referred to in section
8.4.3 may prove very useful in enhancing the
continuity of ADS-B surveillance provision
61. 8.4.8 during temporary outages of the primary (or
equivalent alternative) position data sources.
Any such back-up position data source needs to
report its accuracy and integrity performance to
the ADS-B transmit system, in a format
compliant with ED-102/DO-260 or DO-260A,
as appropriate.
62. 8.5 Barometric Altitude Data Sources
Pressure altitude provided to the ADS-B
63. 8.5.1 transmit system needs to be in accordance with
existing requirements for ATC transponders.
The digitizer code selected needs to correspond
to within plus or minus 38.1 m (125 ft), on a
95% probability basis, with the pressure-
altitude information (referenced to the standard
pressure setting of 1013.25 hectopascals), used
on board the aircraft to adhere to the assigned
64. 8.5.2
flight profile. (ICAO Annex 10, Vol IV,
3.1.1.7.12.2.4. See also EUROCAE ED-26).
The performance of the encoders and of the
sensors needs to be independent from the
pressure setting selected.
GTX 330/330D Installation Manual
Page B-10
Table B-1 Compliance Matrix
AMC Item Compliance Summary
Garmin GNS Equipment: Not
applicable.
Other:
____________________________
____________________________
____________________________
____________________________
_____________
Garmin GNS Equipment: Not
applicable.
Other:
____________________________
____________________________
____________________________
____________________________
_____________
[Section heading, no compliance
statement req'd]
An encoding altimeter or other
altitude source provides pressure
altitude to the transponder.
The Mode C altitude data reported
by the GTX transponder is the same
as the altitude used by the flight
crew to adhere to the assigned flight
profile.
Per the requirements of 14 CFR
91.411(a) and Part 43 Appendix E
sub-paragraph (c), installers are
required to verify transponder
altitude reporting correspondence,
both at initial installation, as well as
subsequently every 24 calendar
months.
Therefore, an installation that meets
the requirements for ATC
transponders also meets this
requirement.
190-00207-02
Rev. U