#edo modification

"Columbia (OV-102) returned to KSC after its 2nd Orbiter Maintenance Down Period (OMDP) overhaul to prepare for its 12th mission (STS-50 USML-1) in June. Later in the OPF Columbia was fitted with the 1st Extended Duration Orbiter (EDO) kit allowing for 14+ day missions."

Date: February 9, 1992

"In Orbiter Processing Facility High Bay 3, workers continue establishing the mechanical interfaces between the U.S. Microgravity Laboratory (USML-1) and the orbiter Columbia. Electrical connections will be performed next. To left of the laboratory module is the Extended Duration Orbiter pallet. Columbia is targeted for liftoff this summer on the STS-50 mission, the first extended duration flight with a scheduled stay of 13 days. Because of inclement weather at the prime landing facility, STS-50 landed one-day later, marking a Shuttle record 14-days in orbit."

Date: April 14, 1992