FAA Federal Aviation Regulations (FARS, 14 CFR)

(a) A person who holds a basic ground instructor rating is authorized to provide:

(1) Ground training in the aeronautical knowledge areas required for the issuance of a recreational pilot certificate, private pilot certificate, or associated ratings under this part;

(2) Ground training required for a recreational pilot and private pilot flight review; and

(3) A recommendation for a knowledge test required for the issuance of a recreational pilot certificate or private pilot certificate under this part.

(b) A person who holds an advanced ground instructor rating is authorized to provide:

(1) Ground training in the aeronautical knowledge areas required for the issuance of any certificate or rating under this part;

(2) Ground training required for any flight review; and

(3) A recommendation for a knowledge test required for the issuance of any certificate under this part.

(c) A person who holds an instrument ground instructor rating is authorized to provide:

(1) Ground training in the aeronautical knowledge areas required for the issuance of an instrument rating under this part;

(2) Ground training required for an instrument proficiency check; and

(3) A recommendation for a knowledge test required for the issuance of an instrument rating under this part.

(d) A person who holds a ground instructor certificate is authorized, within the limitations of the ratings on the ground instructor certificate, to endorse the logbook or other training record of a person to whom the holder has provided the training or recommendation specified in paragraphs (a) through (c) of this section.