Many airports publish a Traffic Pattern Altitude. For those that do not, the standard that pilots are expected to fly is 1000' AGL per the Pilot's Handbook of Aeronautical Knowledge. (The AIM and CFRs likely cover this as well...)
Are ultralights expected to fly the same pattern altitude, or something different? If different, what is the standard and where is it published?
EDIT: This advisory circular references a 500' AGL pattern: AC90-66A
I may answer my own question later, but leaving open for now...