• 51-5111 Second USAF Evaluation Aircraft. Delivered 02-Feb-1951 as YL-20.
• Note: C-127 was the original designation allocated.
Accident: 24-Sep-1951. Cape Newenham, AK. Take off accident due to mechanical failure (Cat4). Written off; pilot Herbert W. Kent survived. Being operated from Elmendorf AFB., Alaska with the 6th RCF.