14 CFR 61.55 says:
(d) A person may receive a second-in-command pilot type rating for an aircraft after satisfactorily completing the second-in-command familiarization training requirements under paragraph (b) of this section in that type of aircraft provided the training was completed within the 12 calendar months before the month of application for the SIC pilot type rating. The person must comply with the following application and pilot certification procedures:
(6) The applicant must appear in person at a FAA Flight Standards District Office or to an Examiner with his or her logbook/training records and with the completed and signed FAA Form 8710-1.
(7) There is no practical test required for the issuance of the “SIC Privileges Only” pilot type rating.
What exactly is an SIC type rating used for and how can someone get a "type rating" without any kind of practical test?