Found this story on
http://tailspinstales.blogspot.be/20...-when-you.html (see under "Know Where You're Going When You Volunteer") pointing to the second ski-equipped AT-7 sent to Greenland for the B-17 crew rescue efforts.
Pilot was Benjamin H. Shiffrin, then with the 103rd Observation Squadron, Fort Devens, MA, but he volunteered for the Greenland mission.
This all was in late Jan 1943, so after the apparent loss of a first AT-7/C-45 on 5 Jan 1943.
Regards,
Leendert