Boe57a returning to Plant 42 during Orange Flag 21-3

Ground test crewmen checking the RR RB211-535C engines of the 757 after completion of engine runs. The engines were started and initial checkout begun on January 23, just 10 days after the aircraft rolled out. The next day, full power runs were made to takeoff thrust of 37.000 pounds and trim tests were completed. Additional runs on January 25 were for calibration purposes, acceleration response, fuel flow measurement and checks of the engines' electronic control system. the RR engines were said to cut fuel consumption by 48% comparted to the aircraft it would replace. Photo from Boeing

What appears to be the official rollout of the Boeing 757. Photo from Boeing

(I assume) the Boeing 757 prototype being built. Photo from Boeing

Part of the certification procedure if the Rejected Take Off test. The aircraft made 15 RTO runs at gross weight ranging from 174.000 to 241.000 pounds. This photo was taken during a test at 241.000 pounds, some 21.000 pounds higher than the initial certification gross weight. Thrust-reversers were not used during the test and engineers have said that the 757's performance was as good or better than earlier predictions. The flight test program remained ahead of schedule, with over 700 of the 1300 flights hours completed. Photo from Boeing

Boeing 57A 757 'Catfish' flew into Plant 42 from St Louis

This Boeing 757 testbed is pictured departing off rw13R at the start of another test flight.