From mid-May to Mid-June of 1991 the T-28 participated in the Cooperative Oklahoma Profiler
Studies (COPS). The plane was used to provide in-situ microphysical measurements for comparison
with radar data from the Cimarron, Ok radar. In addition, the T-28 supplied data for storm dynamicists
and electrical researchers.
The standard package of instruments provided for the
determination of temperature, vertical wind, electric fields, water content, etc. During COPS the
T-28 carried a PMS 2D-P optical probe.