Paul Tomblin wrote:
The AOPA "Guide to TSA's Alien Flight Training/Citizenship Validation
Rule" http://www.aopa.org/tsa_rule/ says that validation is required for
training for "recreational pilot, sport pilot, or private pilot
certificate; multiengine rating; or instrument training". If I've got an
PP-ASEL-IA, does going for my ASES (float rating) constitute going for
another private pilot certificate, or is it just an add-on to my existing
certificate?

Are you an alien student? Do you have a TSA online account? For a U.S.
citizen its the same for any checkride, you need your passport
(sometimes B-certificates is accepted by the examiner) and ID.
If you are an alien student I believe you do not need TSA clearance.
However, if you go for your multi rating you'll need to go through the
processes.

-Robert, CFII (land and sea), TSA certified alien flight training
provider.