On Tuesday, November 13, 2012 3:22:40 PM UTC-8, Andy wrote:
On Nov 12, 7:18*pm, T wrote:

I've been told that the ADS-B out data includes GPS quality/

reliability information that comes from the WAAS receiver. Basically a

"trust me" code. Hopefully the cost of WAAS GPS recievers will come

down in costs as we approach 2020.



The Trig transponders have provision for setting the GPS data

integrity level in the configuration menus. If I had one I'd connect

any available GPS and set the integrity to LOW. I'm not asserting

that is either approved or legal.

Ah but please don't do that in a certified glider, if discovered I would not be surprised if the FAA made an example of any pilot, owner or A&P involved. This is all too high a visibility within the FAA to expect them to ignore transgressors.

Certified aircraft currently require an STC or which there are very few at the moment (but the few that exist are often AML (Approved Model List) STCs so apply to several aircraft makes/models at a time), but there are no STCs for gliders and nobody working on one AFAIK. Eventually the FAA is expected to remove the STC requirement... but still to require a currently expensive TSO'ed IFR/WAAS GPS.

As a part of the current STC requirement the FAA has made it clear that FSDOs are forbidden from issuing any field/337 approvals for any ADS-B data-out installs. Any A&P tryign to pull a "minor repair" or "lets not sign the logbook at all" stunt on an ADS-B data-out install is taking a bad risk.

Darryl