IFD 440 and GDL82 Failing ADS-B SIL

Need help with the particular scenario:

IFD440

GDL82

Configured ADS+B G2 format

SIL is failing almost at 100%

Everything else passes without any issuess.

On the ground, everything appears to check out.

Let me know if I am missing anything. 

Thanks.

Something does not seem right.  The IFD440 according to Avidyne is a slide in replacement for the 430W.  To me, that means that it is form, fit and functionally equivalent to the 430W. Tech support’s answer basically says “well, we are almost functionally equivalent”.

SIL is a function of the transponder and in this case the GDL82.  It seems to me that the GDL82 is not configured correctly.

I would go back and ask engineering, instead of tech support.

Gene

from the FAA AFS-360 requirements

How can the ADS-B OUT system obtain initial approval?

Initial ADS-8 OUT system pairings (transmitter/GPS) must be approved for installation using

the Type Certificate (TC), Amended TC (ATC), or Supplemental Type Certificate (STC)

process. Consult your Aircraft Certification Office to determine the appropriate approval process

for these initial installations. Once the performance of the initial pairing has been established,

the FAA considers follow-on installations of the same pairing to be approved.

Organization Designation Authorization (ODA) holders can issue ATC and STC when

authorized by their FAA Organization Management Team (OMT).