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TWXTRANSCEIVER INTERNAL WAAS GPS CERTIFICATION
October 25, 2016
3:04 am
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johnwfranks
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March 12, 2015
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HI DON,
IT'S MY UNDERSTANDING THAT THE WAAS GPS SOURCE MUST BE TSO CERTIFIED.
SO
WILL THE INTERNAL WAAS GPS BE TSO CERTIFIED OR WILL WE HAVE TO GET AND USE ANOTHER CERTIFIED WAAS SOURCE?
AND
HOW CAN IT BE THAT SINCE THE EX MODEL IS TSOed AND IT HAS AN INTERNAL NON-CERTIFIED WAAS GPS SOURCE DOES THAT MEAN A CERTIFIED ONE IS REQUIRED AND MUST BE SUPPLIED, OR IS IT OKAY AS IS?

FURTHER IS THERE AN UPDATE ON MEETING THE TSO REQUIREMENTS WITH THE TWXTRANSCIEVER?

November 3, 2016
2:53 pm
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Don Houtz
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June 16, 2014
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John: Let me explain the details:

In order to fully install a UAT ADSB Transmitter or Transceiver in a "certified aircraft", that ADSB unit must be verified and authorized by the FAA to the requirements in TSO-C154c. As part of TSO-C154c requirements, the GPS position source must also be TSO'd to the requirements of TSO-C145. So you are basically correct for certified aircraft. The GPS position source currently in the Vision-Pro Plus Transceiver and Transmitter Models has not yet been accepted by the FAA for TSO-C145, but that is what we are trying to accomplish. IF for some reason the FAA does not approve our current GPS, then we have an alternate GPS position source that is already TSO-C145 approved. The problem here is that is it much more expensive and would drive up the unit price significantly.

Now for Experimental/LSA aircraft, the rules are somewhat different. In order to fully install a UAT ADSB Transmitter or Transceiver in a "experimental or LSA aircraft", the ADSB unit does not actually have to be authorized by the FAA under TSO-C154c. It just needs to be tested and verified to meet the requirements of TSO-C154c by the equipment manufacturer. And a letter or statement of compliance to these requirements must be made by the equipment manufacturer. For our Experimental/LSA models of the Vision-Pro Plus, it states this in the installation guide that comes with the unit. So for these units installed in Experimental or LSA aircraft, you are fully compliant to TSO-C154c and meet the FAA requirements for Jan. 1, 2020 but you don't actually get a TSO sticker on the unit.
I know these are crazy rules but it is really a good thing for owners of Experimental or LSA aircraft.

We are still continuing to work with the FAA to complete TSO-C154c for our "Portable" models of the Vision-Pro Plus Transceivers and Transmitter. If you would like to read the requirements of TSO-C154c and all the other TSO's required as part of 154c, you can find these documents on the FAA.gov WEB site. It will give you an understanding of the amount of work required to complete the tasks.

Hope all this makes sense to you
Thanks
Don Houtz
SkyGuardTWX

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