According to the FAA publication:
TECHNICAL PAPER AFS-360-2017-1 (Rev 0, 09/25/2017) INSTALLATION OF ADS-B OUT EQUIPMENT
Filing of the FAA Form 337 is required (see point 12 of that publication):
12. Documenting ADS-B OUT System Performance Verification.
Following system performance verification of the ADS-B OUT installation by OFE and/or ground testing, document the results of the system performance in the aircraft maintenance record per 14 CFR § 43. When system performance is found acceptable, include the statement, “The installed ADS-B OUT system was shown to meet the equipment requirements of 14 CFR § 91.227” in the aircraft maintenance records.
(a) Execute FAA Form 337
In other sites this Form 337 is required to be filed with the FAA for "informational purposes".
As an MRA is required in the S-LSA category and FAA Form 337's are not required, my question to the community is this: Is the FAA requirement that "a FAA Form 337 be filed following the installation of ADS-B equipment" not apply to us? Has anyone filed a FAA Form 337?