GTX 33 Installation Manual
190-00906-00
Page B-10
Rev. F
45.
8.3.4
The value of the horizontal
position quality indicators need to be
based on the integrity
information for the encoding of the
ED-102/DO-260 related NUC and the
DO-260A related NIC quality indica-
tor, as related to the
horizontal position sources.
In addition, the encoding of the DO-
260A NAC quality indicator needs to
be based on
the accuracy information of the hori-
zontal position sources.
GTX 33 calculates DO-260A
NIC using Horizontal Protection
Limit (HPL) provided by the
GPS position source per DO-
260A.
GTX 33 calculates DO-260A
NAC using Horizontal Figure of
Merit (HFOM) provided by the
GPS position source per DO-
260A.
46.
8.3.5
In case of ED-102/DO-260 based
ADS-B transmit systems, the NUC
Quality Indicator value need to be
encoded based on the integrity con-
tainment radius only.
Not Applicable – GTX 33 is
compliant to DO-260A not
DO-260.
47.
8.3.6
If the ADS-B transmit system does
not have a means to determine an
appropriate integrity containment
radius and a valid position is reported,
then the Quality
Indicator (i.e. NUC or NIC) need to be
encoded to indicate that the integrity
containment radius is unknown (i.e.
NUC/NIC should be set to ‘zero’).
Per DO-260A, GTX 33
encodes Type Codes
corresponding to 'unknown' (e.g.
'zero') when valid HPL data is not
available.
48.
8.3.7
Transmitter antenna installation
needs to comply with guidance for
installation of ATC transponders to
ensure satisfactory functioning. (Also
refer to ED-73B)
Transponder antenna is
compliant to TSO-C74c.
49.
8.3.8
If more than one ADS-B transmit sys-
tem is installed, simultaneous opera-
tion of both transmit systems needs to
be prevented.
When two GTX 33
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.
50.
8.4
Horizontal Position Data Sources
[Section heading, no
compliance statement req’d]
Table B-1. Version 1 ADS-B Field Approval Compliance Matrix
Item #
AMC
Section #
AMC Item
Compliance Summary
Summary of Contents for GTX 33
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