a15 1142
Bob Nelson photographs two CT-114 'Tutors' flying the Double Inverted at the Grand Forks Air Force Base (GFAFB) 'Friends And Neighbors Day' on May 27th 1989.
The Snowbird maintenance crews replace the boost pump every 100 hours due to all the inverted flying.
1989 Bob Nelson, photographer, and 2015 Craig Maas for the scans
