When filing FAA/Domestic flight plans you are only able to select one of the codes from the equipment list that is located on page 742 of the AIM section 5-1-8 in the most recent 2015 edition of the FAR/AIM.
The FAA recommends that you file with the maximum transponder or navigation capability of your aircraft. This will provide ATC with the necessary information to utilize all facets of navigational equipment and transponder capabilities available.
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