Whoever is asking the question is being a bit of a dick or bureaucrat. I think your airplane, certified under the CAR's as utility, is approved for spins by definition. If spins are not permitted the airplane is placarded with that fact. See
http://av-info.faa.gov/dst/CARS/CAM-3-7.pdf which says in part
AIRPLANE CATEGORIES
§ 3.20 Airplane categories. (a) For the purpose of certification under this part, airplanes are divided upon
the basis of their intended operation into the following categories:
(1) Normal suffix N. Airplanes in this category are intended for nonacrobatic, nonscheduled passenger, and
nonscheduled cargo operation.
(2) Utility suffix U. Airplanes in this category are intended for normal operations and limited acrobatic
maneuvers. These airplanes are not suited for use in snap or inverted maneuvers.
NOTE: The following interpretation of paragraph (a) (2) was issued May 15, 1947, 12 F.R. 3434: The phrase
?limited acrobatic maneuvers? as used in § 3.6 (now § 3.20) is interpreted to include steep turns, spins, stalls (except
whip stalls), lazy eights, and chandelles.