Ads-B Out Test - Garmin GTX 330D Maintenance Manual

E paragraph C must be completed.
For software updates, only a basic system functional test is required to verify normal transponder operation
and ADS-B system performance is functional.
These regulatory tests require the use of a Mode S transponder ramp tester such as an Aeroflex IFR-6000
or TIC TR-220. Specific instructions for operating the ramp tester are contained in the applicable
operator's manual.

8.7 ADS-B Out Test

The following ADS-B Out parameters must be verified in accordance with Title 14 of the Code of Federal
Regulations (14 CFR) § 91.227 any time the position source (GPS) is replaced/modified. The test is
performed using a transponder ramp test set, such as the Aeroflex IFR-6000 or TIC TR-220. For
instructions on operating the ramp tester, refer to the manufacturer's documentation.
NOTE
Software version 5.30 or later is required on the TR-220.
1. Ensure the aircraft is in a location where a GPS signal can be received (e.g., outdoors with a clear
view of the sky).
2. Power on the aircraft/avionics and ensure that the GTX is powered on.
3. If the GTX is configured for pilot control of the ADS-B transmitter, ensure ADS-B TX is selected
ON.
4. Temporarily put the GTX into airborne mode. Refer to section 8.5.
5. If dual GPS sources are connected to the GTX, each GPS source must be checked separately by
disabling the GPS source not being checked. Disable the GPS source not being checked by
covering the GPS antenna or removing power from that navigator. Verify that the GPS source not
being checked is no longer receiving satellite data.
6. Ensure the GPS source being checked has acquired a position.
7. Select ALT mode on the GTX.
8. Using the transponder test set, verify the following ADS-B Out parameters are being transmitted:
 NACv ≥ 1
 SDA ≥ 2
 SIL ≥ 3

NACp ≥ 8
 NIC ≥ 7
190-00734-11
Rev. 6
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Page 8-5